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

In this article:

1. Introduction
2. What are LED tubes and complete LED luminaires?
3. Who should choose which solution?
4. Key pros and cons
5. Direct comparison (core criteria)
6. Typical use cases
7. Costs & payback
8. Pre‑upgrade checklist
9. Step‑by‑step implementation
10. Frequently asked questions
11. Next steps & contact

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, 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 (EVG). 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. Light distribution, thermal management and control systems are designed to 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

• Advantage: Low purchase cost and very fast retrofit.
• Advantage: Can be installed progressively by area or priority.
• Disadvantage: Limited system efficiency – existing housings and reflectors were designed for T5/T8 fluorescent tubes, not LED tube emission patterns.
• Disadvantage: Light distribution is often not ideal – fluorescent tubes emit 360°, LED tubes emit directed light, so hotspots, shadows and uneven illumination can occur.
• Disadvantage: Compatibility issues with existing ballasts (KVG/EVG) – rewiring is often required.
• Disadvantage: Limited controllability – dimming and modern protocols (e.g. DALI) may not integrate well.
• Disadvantage: Poorer heat dissipation in some retrofits can reduce the expected lifetime.
• Disadvantage: Workplace requirements (illuminance, uniformity, glare control) are often not reliably met.

Complete LED luminaires

• Advantage: Optimized optics and thermal design improve efficiency and light distribution.
• Advantage: Better light quality and higher CRI; easier integration with controls and sensors.
• Advantage: Longer lifetime, lower maintenance, often better grant eligibility.
• Disadvantage: Higher upfront investment and more complex installation (removal and disposal of old fixtures, mounting changes).
• Disadvantage: 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: SwissEnergy – lighting for businesses (energieschweiz.ch).

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.

• Payback LED tubes: about 2–4 years
• Payback 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. Ballasts: document KVG/VVG vs. EVG – photograph ballast labels.
4. Operating hours: record realistic hours, not only schedules.
5. Illuminance: measure at workstations (3–5 points per room) and document uniformity.
6. Visual comfort: assess glare; note the desired CRI and correlated color temperature.
7. Controls: DALI, KNX, Casambi, presence sensors, timers – determine integration needs.
8. Room environment: temperature, dust, humidity (affects selection and lifetime).
9. Disposal: fluorescent tubes are hazardous waste and require proper disposal.
10. Reflectors: they are designed for fluorescent tubes – verify the real light distribution with LED tubes.
11. Grants: check eligibility and deadlines – submit funding applications before ordering.

Step‑by‑step implementation

1. On‑site analysis: inventory, ballast types, photos, illuminance measurements.
2. Funding and offers: check funding options and collect offers for both the retrofit and the complete fixture option.
3. Technical checks: ballast compatibility, reflector suitability, light distribution test.
4. Decide and plan the rollout: disposal, qualified electrician, schedule.
5. Re‑measure after 6–12 months: energy use and user satisfaction.

Frequently asked questions

Do LED tubes meet workplace standards?

In most cases, no. LED tubes often do not achieve the 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.

We’re happy to support you with measurements, evaluation and your rollout plan. Book a short, free call

Sources & further links: energieschweiz.ch (lighting for businesses) · sensorasmart.com – Dan Flühmann