Replacing a fluorescent tube with an LED tube: what about the ballast?
This article is also available in French: Remplacer tube fluo par led ballast électronique
First remove the starter, then check what the ballast says: if it is electronic and the tube states compatibility, the tube fits as it is, with a quarter turn. Otherwise, the ballast is removed and the tube is powered directly at 230 V, live on one side, neutral on the other.
How do you replace a fluorescent tube with an LED tube?
The replacement comes down to three steps: switch off the power at the circuit breaker, remove the starter when there is one, then connect the LED tube either to the retained ballast or directly at 230 V. A tube stated as compatible with an electronic ballast fits without tools.
The full method, with the cases where the ballast stays in place and those where you have to start again from the terminal block, is detailed in our guide to replacing a fluorescent tube with an LED tube. The tipping point is always the same: what the tube manufacturer allows.
Electronic or magnetic ballast: which one to keep?
An LED tube marked as compatible with an electronic ballast can only be fitted to an electronic ballast. The magnetic type, heavier, with its characteristic hum, does not accept these tubes and eventually wears out the lamp.
| Criterion | Electronic ballast retained | Direct 230 V wiring |
|---|---|---|
| Tube required | Ballast-compatible mention on the packaging | Direct tube, single-ended or double-ended |
| Installation | A few minutes, without tools | Batten opened and connections redone |
| Compatible range | Electronic ballast only | All battens, including old ones |
| Service life | Limited by that of the ballast | Linked to the tube alone |
When the original batten is worn out and its diffuser no longer holds, starting from a new unit saves time. The LED lighting range brings together linear formats and ceiling lights that replace these old fittings.
The starter: should you remove it?
Yes, as soon as the tube is directly powered. The starter has nothing left to strike, and an LED tube powered by a bypassed ballast that keeps it flickers or refuses to light.
On battens that do not have one, there is nothing to remove. Our article on when the starter is the cause helps you decide between a worn starter and a tube at the end of its life.
The starter sits in a small box on the side of the batten. It comes out with a quarter turn, without tools, and is never put back on a directly powered tube.
In a utility room, a pantry or a garage, the batten is often the only light source in the room. Our page for renovating a secondary room covers these spaces that are lit by default.
LED fluorescent tube price: what makes the bill vary
It is not the tube that weighs, it is the time spent on the step ladder. A ballast-compatible tube is changed in two minutes, without tools. A tube to be wired requires opening the batten, identifying the wires and redoing each connection: the expense moves from the product to the labour.
In which room are you replacing your tube?
Ballast-compatible tube or direct wiring?
The compatible tube is chosen based on the ballast reference, not on the length alone. Direct wiring ignores the ballast and depends only on the tube.
- Compatible tube: explicit mention on the packaging, quarter-turn refitting
- Direct wiring: ballast removed or bypassed, tube powered at 230 V
- Magnetic ballast: never retained with an LED tube
- Old batten: accessible terminal block and sound connections required
Change the tube or the whole light fitting?
The tube is changed when the batten is sound and the terminal block is accessible. The complete unit is replaced when the fitting cracks, the diffuser yellows or the room changes use.
A diffuser that no longer clips on, a casing that heats abnormally, a fixing that has taken on moisture: three signs that call for replacement. Our article on choosing between tube, starter or complete light fitting details these borderline cases.
When the choice leans towards a new unit, a flat LED ceiling light replaces the fluorescent one without touching the ceiling. A ceiling fluorescent tube is also handled differently from an under-cabinet batten, with the weight of the unit and access to the terminal block at the top: see changing a ceiling fluorescent tube.
Which LED tube should you choose?
Length and colour temperature make up most of the choice. An LED tube is measured in 600 mm, 1200 mm or 1500 mm, and its light is decided according to what you look at underneath it: a worktop, a mirror, a car.
LED battens and light fittings to replace your tubes
A tube never lives alone. Our guide to switching to all-LED room by room shows how light sources complement each other instead of adding up.
T8 and T5 length: measure before ordering
A T8 is 26 mm in diameter, a T5 is 16 mm. The decisive figure remains the length, measured including the pins, with the type of cap at the ends.
- 600 mm: under-cabinet, cupboard, small pantry
- 1200 mm: the standard for kitchens and garages
- 1500 mm: workshop, long worktop
- Diameter: T8 at 26 mm, T5 at 16 mm, not interchangeable
Which colour temperature for each room?
A 4000 K makes a worktop readable without turning food blue. A 3000 K warms a bedroom. A 6500 K stays reserved for the garage and the workshop, where precision is what you are after.
| Temperature | Rendering | Room |
|---|---|---|
| 3000 K | Warm white | Bedroom, living room, hallway |
| 4000 K | Neutral white | Kitchen, utility room, bathroom |
| 6500 K | Cool white | Garage, workshop, pantry |
To decide between white or yellow light, the reliable reference remains the task to be lit, not the label on the box.
The catalogue counts 18,269 LED lighting references as of 29 September 2026. On a sample of 250 of these references on the same date, LED technology is stated on 249 listings and a 2-year warranty on 250. All-LED is therefore not an exception in a range, it is the baseline.
Under wall units, the batten does the job. Above an island, it is a kitchen light fitting that sets the tone for the room. And if the kitchen mixes tubes and spotlights, our caps and temperatures explained complete the basics.
How do you wire an LED batten, step by step?
Four steps: switch off at the circuit breaker, check that there is no voltage, identify live and neutral, then connect. On a two-tube setup, each receives the same supply, in parallel and never in series.
Before touching the wiring, understanding what heats up and what lasts in an LED explains why the ballast becomes unnecessary.
Switch off, check, identify
The circuit breaker is switched off first of all. The tester confirms that there is no voltage on each wire. Identification comes next: live on one side, neutral on the other, earth if the casing is metal.
- Circuit breaker: switched off and checked with a tester, not just the switch
- Terminal block: sound connections, no wire stripped along its length
- Live and neutral: identified before any dismantling
- Cross-section: 1.5 mm² is enough for a domestic batten
Connecting a double tube
Two tubes, two parallel supplies. The 230 V arrives on one side and each tube connects to the same terminal block. A series setup makes the whole thing flicker or lights only the first tube.
A direct tube comes in a single-ended version, both wires on the same side, or a double-ended version, with the supply split between both ends. The version stated on the packaging must match the wiring in place.
Our article on wiring an LED step by step covers these steps on other formats and other fittings.
Are you hesitating between keeping the ballast and switching to direct 230 V? Describe your light fitting and the ballast model, and we will confirm the diagram before you climb on the step ladder. The page for getting your wiring diagram validated accepts photos and the ballast reference.
An installer working through several rooms benefits from grouping their orders: our Designix trade space follows this pace. For a workshop or a garage, a surface-mounted industrial light fitting withstands dust and knocks better than a bare batten.
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