Learning Center

How long does an LED last? Understanding Lx, B and C values and lifetime factors

Dan Flühmann — Wed, 18 Feb 2026 23:37:40 GMT

LEDs don’t fail suddenly — they slowly lose brightness over time. Manufacturers state lifetime using Lx, By and Cz values (for example L70 B20 C5). Typical rated lifetimes today are often between 70,000 and 100,000 hours.

This article explains those values in plain language, lists the main environmental factors that shorten lifetime, and gives practical, non-technical tips for users and buyers.

Introduction

LED fixtures are known for long life, but many users notice lower brightness after several years. Instead of measuring a single “hours to failure,” manufacturers specify how much light remains after a certain runtime.

Understanding this helps you choose the right product, install it correctly, and plan simple maintenance.

What Does “Lifetime” Mean for LEDs?

For LEDs, lifetime is usually not the moment the lamp stops working. It refers to the reduction of light output over time.

Manufacturers often specify rated lifetimes like:

50,000 hours
70,000 hours
100,000 hours

These values are typically provided together with L/B/C values. They help you plan replacement cycles and set realistic expectations.

Further reading: https://sensorasmart.com/

Lx / By / Cz — What the Values Mean

In short:

Lx – Remaining light as a percentage after the stated hours
Example: L70 = 70% of initial light output remains.

By – Share of luminaires below the Lx threshold
Example: B20 = 20% fall below that level.

Cz – Share of luminaires that have completely failed
Example: C5 = 5% total failure.

Example Explained

“L70 B20 C5 at 70,000 h” means:

After 70,000 hours, the group still produces on average 70% of initial light.
About 20% of luminaires are below 70%.
Around 5% have failed completely.

These figures are useful for planning replacements and understanding long-term light quality.

Who Should Care?

This information is relevant for:

Private households
Property owners
Facility managers
Small businesses

It helps buyers make informed decisions without needing deep technical knowledge.

Which Environmental Factors Shorten Lifetime?

The real lifetime of an LED depends heavily on its environment. Key factors include:

High temperature
Heat is the most common enemy. Excessive fixture temperature shortens chip and electronics life.

Moisture and condensation
Damp spaces and temperature swings can corrode contacts or damage electronics.

Salt or chemical exposure
Coastal locations or chemically aggressive environments increase corrosion risk.

Dust and dirt
Dirty optics reduce light output and can create local overheating.

Electrical quality
Voltage spikes, unstable supply, or low-quality drivers increase failure risk.

Mechanical stress
Vibrations or repeated shocks can loosen connections.

If you know the installation environment, you can select appropriate IP protection, materials, and driver quality.

How to Extend LED Lifetime

You don’t need to be an engineer to help LEDs last longer. Consider these practical steps:

Ensure good ventilation and heat dissipation
Choose fixtures suitable for the location (correct IP rating)
Use quality drivers with protective features
Install surge protection
Operate gently (moderate dimming reduces heat and slows aging)
Clean optics and vents regularly

Small measures can significantly improve lifespan.

Practical Checklist (Short Version)

Check the datasheet for Lx/By/Cz values and rated hours.
Choose fixtures that match the environment (IP rating, materials).
Install so heat can escape — avoid sealed or cramped enclosures.
Use reliable, tested drivers.
Clean optics occasionally.
Record purchase date and estimated operating hours for planning.

FAQ

Will an LED suddenly stop working?

Rarely. Most LEDs gradually lose brightness over time. Individual electronic failures can occur, especially with poor power quality or low-quality drivers.

What should I request when buying?

Ask for:

Lx / By / Cz figures
Rated hours
Driver specifications
IP rating
Maximum Tc (case) temperature

Next Step

Understanding Lx/By/Cz values and environmental influences helps you avoid surprises and make smarter purchasing decisions.

If you’d like, send a datasheet or describe your intended installation. I can help interpret the values and provide a short, practical recommendation tailored to your situation.

Further information: https://sensorasmart.com/
Book a meeting with Dan Flühmann: https://meetings-eu1.hubspot.com/daniel-fluehmann

Maintenance Factor (MF) in Lighting Design: Four Areas, Risks of Wrong Planning, and Practical Next Steps

Dan Flühmann — Wed, 18 Feb 2026 23:35:01 GMT

The maintenance factor (MF) summarizes how much useful light will be lost over time and what reserve you must plan to keep illuminance at the required level. This article explains the four MF areas, the consequences of wrong assumptions, why planners often assume MF values that are too optimistic, and what to do in your project.

Introduction

When designing lighting, you usually start from initial photometry and energy performance. The Maintenance Factor (MF) is the planning parameter that translates those initial values into expected performance over time.

A clearly documented MF helps avoid underlighting, costly retrofits, and wasted capital.

What Is the Maintenance Factor (MF)?

The MF is a dimensionless number ≤ 1 that is applied to the initial luminous output to account for expected light losses during operation.

In practice, the overall MF is often calculated as the product of several subfactors:

Lamp/LED behavior
Luminaire behavior
Soiling
Room reflectances
Operational policies

Required initial illuminance = Target illuminance ÷ MF

The Four MF Areas

1) Lamp Lumen Maintenance / Lumen Depreciation and Replacement Strategy

This area covers how the light output of the light source drops over time.

For LEDs: lumen maintenance (L70, L80, L90)
For conventional lamps: lumen depreciation

It also includes replacement policy. Are failed or weak lamps replaced early, or is replacement deferred? Replacement strategy has a significant impact on effective MF.

2) Luminaire Lumen Maintenance

Losses inside the luminaire — optical efficiency drop, driver losses, yellowing or aging of lenses and reflectors — reduce useful emitted light.

Different designs and materials show different long-term behavior. Manufacturer data sheets provide guidance on expected luminaire lumen maintenance.

3) Luminaire Soiling (Luminaire Dirt Depreciation)

Dust and deposits on covers, reflectors, and optics reduce light output.

The impact depends on:

Luminaire type
Mounting position
Environmental cleanliness (office vs. workshop vs. dusty hall)

Cleaning intervals reduce this effect but increase operating costs.

4) Room Maintenance Factor (Surface Reflectance Changes)

Ceilings, walls, and floors lose reflectance over time due to dirt and staining.

Lower surface reflectances reduce the room cavity contribution and therefore usable illuminance.

Standards provide typical room-MF values depending on room type and maintenance cycle.

Impacts of Incorrect MF Assumptions

Wrong MF assumptions typically lead to two outcomes:

MF Too High (Too Optimistic)

Too few luminaires specified
Insufficient initial output
Installed illuminance drops below required levels after a short time
Retrofits, production disruptions, safety risks, reputational damage

MF Too Low (Too Conservative)

Overspecified luminaires
Higher upfront investment
Possibly unnecessary energy consumption

Risk increases if planned maintenance (cleaning, relamping) is not actually performed as assumed.

Why MF Is Often Assumed Too High

“Too high” means planners assume minimal degradation and choose an MF close to 1.

Common reasons:

Cost pressure (fewer luminaires reduce capital expenditure)
Overreliance on optimistic manufacturer data
Unclear responsibility between design and facility management
Marketing claims about LED stability adopted without validation

Short-term savings often lead to long-term correction costs.

Checklist for Correct Planning

Assess room type and realistic soiling level (office vs. industrial).
Agree and document cleaning and relamping intervals with facility management.
Review manufacturer data and apply conservative correction factors if needed.
Measure or conservatively select room reflectances and include them in the MF calculation.
Run at least three scenarios: optimistic, realistic, conservative — and compare lifecycle costs (LCC).
Measure after commissioning and update MF assumptions after 1–3 years based on real data.

FAQ

Can LEDs justify a higher MF?

LEDs generally have better lumen maintenance than conventional lamps. However, luminaire soiling and room reflectance changes still apply.

Do not rely solely on lab data — check long-term field performance and match it to your operating environment.

Where Do I Find Tabulated MF Values?

You can calculate MF from lamp and luminaire data sheets.

Additionally, practical tables exist in standards and guidance documents (e.g., CIE publications) that list typical MF values by soiling class and maintenance interval.

Use manufacturer data sheets as primary data and standards/handbooks for plausibility checks.

For project support and example tables:
https://sensorasmart.com

How to Handle MF for Your Project

The MF is not a minor parameter — it directly affects quality, safety, and cost.

Practical steps:

Define target illuminance and evaluation period (e.g., 3 years until first review).
Collect necessary data: LED lumen curves, luminaire maintenance data, expected soiling, planned maintenance intervals.
Compute MF as the product of subfactors (lamp, luminaire, soiling, room). Run at least three scenarios.
Perform a lifecycle cost analysis (LCC).
Document all assumptions and formally agree maintenance cycles with operations. Remeasure and adjust after real use.

We at Sensora Smart support you with MF simulations, scenario analyses, and lifecycle cost evaluations.

Book a free initial consultation:
https://meetings-eu1.hubspot.com/daniel-fluehmann

Sources

CIE Publication 97 — Guide to maintenance of indoor lighting systems
Lamp and luminaire manufacturer data sheets
Sensora Smart knowledge base and project references: https://sensorasmart.com

Intelligent Lighting vs. Uncontrolled Lighting: Which Is Right for Your Business?

Dan Flühmann — Wed, 18 Feb 2026 23:32:36 GMT

Intelligent lighting extends the lifespan of luminaires through demand-based switching and dimming, while improving comfort and safety. Uncontrolled lighting is cheaper to buy and simpler to operate, but typically leads to higher operating and maintenance costs. This article explains the differences, pros and cons, and how to test and decide for your site.

Introduction

Lighting accounts for a noticeable share of energy costs in many businesses. Depending on activity and building type, lighting can represent a significant portion of electricity spend — so there’s real value in evaluating more efficient options.

Swapping to LED often yields quick wins; adding control systems unlocks further savings and operational benefits.

For practical project support and case examples, see:
https://sensorasmart.com/

What Is Intelligent vs. Uncontrolled Lighting?

Uncontrolled lighting means basic on/off switches or permanent installations. Fixtures are either on or off, with no automatic adjustment.

Intelligent lighting uses sensors (motion, daylight), time profiles, and control logic. Typical setups include:

A presence profile (full light when occupied)
An energy-saving profile (dimmed or off when unoccupied)

The system automatically adapts lighting to demand, time of day, and how a space is used — switching, dimming, or applying scenes instead of lighting entire areas indiscriminately.

Who Each Solution Suits

Uncontrolled lighting

Very small businesses with limited budgets
Spaces with constant occupancy
Heritage sites where technical intrusion must be minimal

Intelligent lighting

Medium to large businesses
Logistics halls and warehouses
Offices and retail
Any environment where energy savings, maintenance reduction, and occupant comfort matter

Key Features

Sensors
Presence, motion, and daylight sensors form the core of intelligent systems.

Control
Time schedules, zoning, and scene control replace simple on/off switching.

Integration
Networking with building management systems (BMS) is possible. Many systems also operate autonomously without continuous central control.

Hardware
LED luminaires are standard. Dimmable drivers and common interfaces (DALI, KNX, Zigbee) increase flexibility.

Benefits of Intelligent Lighting

Energy savings
Automatic shut-off, dimming, and daylight compensation reduce consumption. Well-designed systems commonly achieve double-digit percentage savings.

Extended luminaire life
Demand-based switching and dimming reduce operating hours, delaying replacements and lowering maintenance effort.

Environmental impact
Lower energy use and fewer replacements reduce CO₂ emissions and material waste.

Drawbacks & Risks

Higher upfront cost — Sensors, control gear, design, and installation cost more than basic fixtures.
Project complexity — Design, commissioning, and integration require specialist skills. Poorly specified systems can annoy users or underdeliver on savings.

Typical Use Cases

Manufacturing and logistics halls — Zone control reduces lighting in seldom-used areas.
Offices — Presence and daylight-linked control save energy in open plans and meeting rooms.
Retail — Targeted lighting enhances merchandising while controlling energy use.
Warehouses — Motion-activated lighting along aisles instead of full-time illumination.

Costs & Economics

Intelligent systems require a higher initial investment than basic lighting. However, modern designs often pay back through lower operating and maintenance costs.

For reliable numbers, have a lighting or energy specialist simulate current and projected energy consumption and prepare a business case. This provides a solid basis for decision-making.

Simulation and pilot planning services:
https://sensorasmart.com/services/

Side-by-Side Comparison

Initial cost

Uncontrolled: Lower
Intelligent: Higher

Operating cost

Uncontrolled: Higher
Intelligent: Lower

Luminaire life

Uncontrolled: Often shorter effective life
Intelligent: Extended via demand-based use

Occupant comfort

Uncontrolled: Limited
Intelligent: Improved

Demo / Pilot Checklist

Engage a lighting consultant to record the current state (baseline).
Simulate current and projected energy use and produce a cost-benefit analysis.
Set clear goals (energy reduction %, comfort targets, maintenance targets).
Choose a representative pilot area (warehouse aisle, office floor, retail zone).
Compare simulation outputs with measured pilot results and collect user feedback.

How to Test a System (Trial Plan)

Rather than relying solely on vendor claims, get an independent simulation and run a small pilot. Measure energy use, operating hours, and user acceptance. Use pilot data to validate the simulation and refine the rollout plan before making a larger investment.

Getting Started

Book a professional lighting survey and baseline measurement.
Prioritize areas with the highest savings potential.
Design a pilot with clear KPIs and timeline.
Check available subsidies and prefer open standards for long-term flexibility.

FAQ

Does intelligent lighting actually lower costs?

Yes — through reduced operating hours, dimming, and smarter maintenance. Savings depend on usage patterns and system quality.

Does control extend LED lifetime?

Yes. While LEDs are long-lived, reducing effective operating hours through demand-based control delays replacements and reduces lifecycle costs.

Conclusion

Plan intelligent lighting based on robust simulations and professional advice. A carefully executed pilot demonstrates whether the technology delivers expected savings and comfort improvements — and provides the data you need to scale with confidence.

Article by Dan Flühmann
For case studies and consultation:
https://sensorasmart.com/
Book a meeting: https://meetings-eu1.hubspot.com/daniel-fluehmann

Will a modern lighting installation still meet standards in ten years?

Dan Flühmann — Wed, 18 Feb 2026 23:30:07 GMT

A high-quality, modular LED system with good documentation, open control interfaces, and a planned maintenance strategy can still meet relevant standards in ten years — or be upgraded with relatively low effort.

Introduction

If you’re buying or managing lighting today, you’re right to ask whether that system will still comply with standards a decade from now. LEDs and control systems improve quickly, and regulations around energy efficiency and health are evolving.

Below, I explain what “meeting standards” practically means, which technical and procurement choices matter most, and what you can do today to keep your installation compliant or easily upgradeable.

What “Meet Standards” Means

To “meet standards” means the installation complies with requirements for its intended use. Key measurable criteria include:

Appropriate illuminance levels (lux) for the room or task
Proper glare control and light distribution
Adequate color quality (e.g., CRI/Ra or task-specific indices)
Energy efficiency (lumens per watt) and labeling requirements
Safety, EMC compliance, and control/communication standards (e.g., DALI)

Who This Matters For

This question is especially important for:

Property owners and facility managers planning long-term budgets
Lighting designers and electrical contractors responsible for compliance
Institutions with specific requirements (healthcare, education, industrial production)

Why Standards and Requirements Change

Standards evolve for three main reasons:

Technological progress: LEDs, drivers, and controls improve — raising performance expectations.
Energy policy: Regulators tighten efficiency requirements to reduce consumption.
Health research: New findings about light’s biological effects (e.g., circadian impact) influence recommendations and sometimes regulations.

A system that’s state-of-the-art today may require adjustments later to remain fully compliant.

Technology, Wear, and Light Quality

LEDs do not fail suddenly like incandescent bulbs — but they change over time. Important indicators include:

Lumen maintenance (L70, L80, L90): Time until light output drops to a defined percentage
Color stability (SDCM / MacAdam steps): ≤ 3 indicates tight color consistency
Color rendering (CRI/Ra or application-specific indices)
Driver quality, thermal management, and surge protection

Manufacturer lumen maintenance data, test reports, and warranty terms are essential to estimate long-term performance.

Criteria for Future-Proof Lighting

Choose features that simplify upgrades and long-term compliance:

High initial efficacy (lm/W) with documented lumen maintenance (e.g., L90 ≥ 50,000 h where appropriate)
Good color rendering (Ra ≥ 80–90 depending on application) and SDCM ≤ 3
Modular design with replaceable LED modules and separate drivers
Open control protocols (DALI-2, Zhaga, KNX, etc.)
Appropriate IP/IK protection and robust electronics
Clear certifications and multi-year warranty commitments

Practical Checklist: Purchasing & Maintenance

Request lumen maintenance curves, SDCM data, and CRI/TLCI values.
Check warranty length and coverage (minimum 5 years; 7–10 years advisable for critical areas).
Include a maintenance factor in lighting calculations to account for aging.
Specify products with accessible modules and drivers.
Keep an accurate asset list with manufacturer details and serial numbers.
Consider monitoring or a basic lighting management system to track performance and energy use over time.

Costs & Total Cost of Ownership

Future-proof systems often cost more upfront but reduce lifecycle expenses through:

Lower energy consumption
Fewer full replacements
Easier upgrades

Evaluate Total Cost of Ownership (TCO) rather than just purchase price.

FAQ

What if regulators demand higher lm/W thresholds later?

If luminaires are modular or use open controls, LED modules or drivers can often be retrofitted. Fully integrated fixtures may require complete replacement.

How important is documentation?

Very important. Test reports, data sheets, and warranty terms allow you to assess long-term performance and compliance risk.

Does lighting control help future-proof installations?

Yes. Flexible control systems allow you to adjust lighting behavior, improve energy efficiency, and integrate newer components without replacing entire systems.

Conclusion & Next Steps

Yes — a well-specified modern lighting system can still meet standards in ten years if you prioritize quality, modularity, open controls, documentation, and maintenance planning.

Start with a precise inventory, request manufacturer performance data (lumen maintenance, SDCM, CRI, warranty), and define upgrade paths early to avoid expensive surprises later.

Contact

Learn more or book a meeting with Dan Flühmann:
https://sensorasmart.com
https://meetings-eu1.hubspot.com/daniel-fluehmann

Uniformity of Lighting — What it is and why it matters

Dan Flühmann — Wed, 18 Feb 2026 23:27:15 GMT

Uniformity describes how evenly light is distributed across a surface. It affects visual comfort, safety, and work quality — and when planned and monitored correctly, it reduces errors, accidents, and visual fatigue. This article explains the concept, outlines common problems when uniformity is poor, and gives practical steps you can use immediately.

Introduction

Uniformity often goes unnoticed until it’s missing: sudden shadows, bright spots, or areas where detail disappears are immediate clues. In any space where people work, inspect, assemble, or present, an appropriate distribution of light is essential for health, safety, and quality. Below are the core ideas, common pitfalls, and practical measures you can apply right away.

What Is Uniformity?

Uniformity describes how similar illuminance (or luminance) values are across a defined surface. In practice, you measure multiple points across a grid and compare results:

Tight, similar values = high uniformity
Large differences = poor uniformity

For facades or roads, luminance (how bright a surface appears) can matter more than illuminance.

The measurement layout must match the task: a workbench, a vertical control panel, and a road surface all require different measurement setups.

Who Needs It?

Short answer: anyone who relies on visual performance, safety, or presentation.

Production & quality control: uniform lighting reduces mistakes and rework
Offices & admin areas: consistent lighting lowers fatigue and improves focus
Retail & showrooms: even illumination improves product perception
Traffic areas (car parks, tunnels): consistent luminance supports orientation and safety

Key Points / Characteristics

Uniformity is relational — it compares values across points, not only absolute brightness
Room geometry, luminaire optics, and surface reflectances strongly influence distribution
Aging, dirt, and maintenance change uniformity over time
A good measurement strategy (grid, height, number of points) is essential for reliable conclusions

Benefits

Good uniformity delivers direct, measurable advantages:

Less visual fatigue → people stay focused longer
Lower error rates in assembly and inspection → improved quality
Reduced accident risk → fewer downtime and liability issues
Better spatial perception → stronger customer experience and longer dwell time

Use Cases Where Uniformity Is Critical

Assembly workstation: uneven light creates shadows on small parts and increases faulty assembly
Inspection station: changing brightness levels lead to inconsistent pass/fail decisions
Warehouse aisles: dark spots increase trip and handling risks
Showroom/window displays: uneven illumination distorts color and product appearance

Demo & Test Checklist

Define the visual task and target illuminance for the area
Choose a measurement grid (number of points and spacing based on area size)
Run a simulation in a lighting design tool and review predicted spreads
Select luminaires with appropriate beam shapes and factor in maintenance and lumen depreciation
Perform measurements, document results, and prioritize quick fixes (optics, positioning, cleaning)
Plan cleaning and replacement cycles — fixtures age and accumulate dirt at different rates

FAQ

What uniformity value is “good”?

It depends on the task. Precision work areas require higher uniformity than storage zones. Use standards as a baseline and verify that the values actually support the work being done.

When should I measure?

Measure after maintenance work, or when the space’s use changes.

What gives the quickest improvement?

Luminaire placement and optics usually have the biggest impact. Often, repositioning fixtures or using a different optic yields large gains quickly.

Next Steps & Contact

Start with a simple lighting check: measure a grid, document deviations, and prioritize quick interventions (optics, layout, cleaning). If you want, I can prepare a test template or measurement protocol tailored to your grid.

Learn more at: https://sensorasmart.com
Book a meeting with Dan Flühmann: https://meetings-eu1.hubspot.com/daniel-fluehmann

LED tubes vs. complete LED luminaires: pros and cons, and what to do next

Dan Flühmann — Wed, 18 Feb 2026 22:15:33 GMT

LED tubes (retrofit lamps) are often the fastest and least expensive way to replace old T5 fluorescent tubes. Complete LED luminaires deliver better system efficiency, light quality, controllability, and durability — at a higher upfront cost. Which approach fits your building depends on visual comfort requirements, budget, grant eligibility, and your long-term strategy.

Introduction

Converting a T5 fluorescent installation to LED is often a worthwhile investment: lower energy consumption, reduced maintenance, and modern control options are common benefits. The two common approaches are replacing the tubes with LED retrofit tubes (LED tubes) or replacing the whole fixture with a dedicated LED luminaire. This article explains the differences, the practical pros and cons of each approach, and the checks you should run before deciding.

What Are LED Tubes and Complete LED Luminaires?

LED tubes: Replacement LED tubes that plug into existing fluorescent fixtures. Some types require a ballast bypass (rewiring) while others are designed to work with specific electronic ballasts (EVGs). They are a fast retrofit option but rely on the existing fixture housing and optics.

Complete LED luminaires: New fixtures with integrated LED modules, engineered optics, heat sinks, and electronics. These are designed so the light distribution, thermal management, and control systems work together for optimal performance and lifetime.

Who Should Choose Which Solution?

LED tubes are a sensible choice when you need a fast, low-cost reduction in energy use and the spaces have low visual comfort requirements — for example garages, technical rooms, gas supply rooms, ancillary spaces, or storage areas with few operating hours.

Complete LED luminaires are the right choice where visual comfort, uniform illuminance, and control matter — offices, production lines, schools, and workplaces. They are more future-proof, easier to integrate with controls (DALI, sensors), and often eligible for grants.

Key Pros and Cons

LED Tubes — Advantages

Low purchase cost and very fast retrofit
Can be installed progressively by area or priority

LED Tubes — Disadvantages

Limited system efficiency: existing housings and reflectors were designed for T5/T8 fluorescent tubes, not LED tube emission patterns
Light distribution is often not ideal: fluorescent tubes emit 360°, LED tubes emit directed light — hotspots, shadows, and uneven illumination can occur
Compatibility issues with existing ballasts (KVG/EVG) — rewiring is often required
Limited controllability: dimming and modern protocols (e.g., DALI) may not integrate well
Poorer heat dissipation in some retrofits can reduce expected lifetime
Workplace requirements (illuminance, uniformity, glare control) are often not reliably met

Complete LED Luminaires — Advantages

Optimized optics and thermal design improve efficiency and light distribution
Better light quality and higher CRI; easier integration with controls and sensors
Longer lifetime, lower maintenance, often better eligibility for grants

Complete LED Luminaires — Disadvantages

Higher upfront investment and more complex installation (removal/disposal of old fixtures, mounting changes)
More planning effort and, depending on operating hours and subsidies, a longer payback period

Direct Comparison (Core Criteria)

Compare both options using: investment cost, installation effort, system efficiency, kWh savings, lifetime, light quality (CRI, correlated color temperature), controllability, thermal behavior, appearance, grant eligibility, and payback time.

In short: LED tubes are cheaper and faster to deploy. Complete luminaires are more sustainable and provide better lighting outcomes.

Useful reference and funding guidance: Energy Switzerland — Lighting for businesses (energieschweiz.ch)
For consultancy: sensorasmart.com

Typical Use Cases

Garages, technical rooms, ancillary areas with low operating hours: LED tubes are often sufficient
Offices, schools, inspection stations, and production areas: complete LED luminaires recommended (uniform illuminance, low glare, high CRI)
High-bay halls: specialized LED modules and optics are required for uniform illuminance

Costs & Payback

As a rule of thumb, LED solutions save around 40–60% energy compared with T5 fluorescent systems.

Typical payback times:

LED tubes: about 2–4 years
Complete LED luminaires: about 3–6 years

Payback depends on electricity price, operating hours, and subsidies. Use measured power, realistic operating hours, and your electricity cost for a reliable business case.

Pre-Upgrade Checklist

Administrative data: contact person, room ID, room usage, operating hours (h/day, days/year), electricity price (ct/kWh)
Inventory: number of fixtures, fixture type, tube type (T5), manufacturer/model — take photos of nameplates
Document ballasts: KVG/VVG vs. EVG — photograph ballast labels
Record realistic operating hours (not only schedules)
Measure illuminance at workstations (3–5 points per room) and document uniformity
Assess glare and visual comfort; note desired CRI and correlated color temperature
Check controls: DALI, KNX, Casambi, presence sensors, timers — determine integration needs
Note room environment: temperature, dust, humidity (affects selection and lifetime)
Plan disposal: fluorescent tubes are hazardous waste and require proper disposal
Inspect reflectors: reflectors are designed for fluorescent tubes — verify the real light distribution with LED tubes
Check grant eligibility and deadlines (submit funding applications before ordering)

Step-by-Step Implementation

On-site analysis (inventory, ballast types, photos, illuminance measurements)
Check funding options and collect offers for both retrofit and complete fixture options
Technical checks: ballast compatibility, reflector suitability, light distribution test
Decide and plan the rollout (disposal, qualified electrician, schedule)
Re-measure 6–12 months after: energy use and user satisfaction

Frequently Asked Questions

Do LED tubes meet workplace standards?

In most cases, no. LED tubes often do not achieve required uniformity and can create glare because the fixture optics are not matched to the directed emission of LED tubes.

Do I have to remove ballasts?

With conventional magnetic ballasts (KVG/VVG), rewiring is usually required. For electronic ballasts (EVG), check the LED tube manufacturer’s compatibility list. Often, replacing the complete fixture is the technically safer solution.

How should I measure at workplaces?

Measure illuminance at three to five points per room and check uniformity (min/max ratios) to verify compliance with workplace requirements.

Next Steps & Contact

Start with an on-site analysis: fixture inventory, operating hours, and 3–5 illuminance measurements in representative rooms. Based on that, decide whether LED tube retrofits or complete fixture replacement is the better long-term choice.

If you want help with measurements, evaluation, or implementation, contact a lighting designer or consultancy. We’re happy to support you in reviewing your analysis and rollout plan. Book a short, free call here:
Schedule a meeting: https://meetings-eu1.hubspot.com/daniel-fluehmann

Sources & further links:
energieschweiz.ch (Lighting for businesses)
sensorasmart.com
— Dan Flühmann