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

  Dan Flühmann  ·  3 minute read

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

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

 

Step-by-Step Implementation

  1. On-site analysis (inventory, ballast types, photos, illuminance measurements)
  2. Check funding options and collect offers for both retrofit and complete fixture options
  3. Technical checks: ballast compatibility, reflector suitability, light distribution test
  4. Decide and plan the rollout (disposal, qualified electrician, schedule)
  5. 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