Domakihub How to Replace a Fluorescent Tube Safely and Correctly
A clear, step-by-step walkthrough for swapping a dead fluorescent tube in any home, rental, or hotel room.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 4 min read
A flickering or dark fluorescent tube is one of the most common lighting problems in Greek homes, holiday apartments, and hotel rooms — and it is one of the easiest to fix yourself. The video above from eSpares walks through the removal and fitting process visually, while this guide breaks it down into clear, ordered steps with the practical details you need. No electrician is required for a straight tube swap, and the whole job typically takes under ten minutes.
Understanding Fluorescent Tube Types
Fluorescent tubes come in a handful of standard sizes. The most common in Greek residential and commercial properties are the T8 (26 mm diameter) and the older T12 (38 mm diameter). The number on the label — for example G13 or G5 — refers to the cap type, which determines how the tube locks into the fitting. Before buying a replacement, note the wattage, length, and cap type printed on the side of the old tube.
If the fitting is several decades old it likely uses an older T12 ballast, while modern fittings are usually T8 or T5. Mixing the wrong tube with the wrong ballast will either prevent it from starting or shorten its life significantly, so matching the specification is the single most important preparation step.
Safety First: Power and Handling
Always switch off the light at the wall and — if you want to be completely safe — trip the relevant circuit breaker before touching the fitting. Fluorescent tubes contain a small amount of mercury vapour, which means a broken tube should be treated as hazardous waste: ventilate the room, avoid breathing any dust, wrap the pieces in newspaper, and take them to a municipal recycling point rather than the household bin.
Never grip a fluorescent tube by the glass when twisting it out of the holder. Use both hands on the body of the tube and keep a firm but gentle hold to avoid cracking it.
How to Replace a Fluorescent Tube: 5 Steps
- 1
Switch Off the Power and Let the Tube Cool
Turn the light off at the wall switch and wait at least two minutes. A fluorescent tube that has been running gets warm at both ends near the pins, and working on a cool tube gives you a safer, more comfortable grip. If the fitting is on a ceiling, position a stable stepladder so you can reach it comfortably with both hands free.
- 2
Identify the Tube Type and Buy the Right Replacement
Read the label on the existing tube before you remove it. Note the length (common lengths: 600 mm, 1200 mm, 1500 mm), the wattage (typically 18 W, 36 W, or 58 W for T8), and the cap code (G13 for T8, G5 for T5). Take a photo with your phone so you have the reference at the hardware store. Buying an identical specification is the safest choice; upgrading to an LED-compatible T8 tube is possible but requires checking ballast compatibility first.
- 3
Remove the Old Tube
Most T8 tubes are held by rotating them a quarter-turn (90 degrees) and then sliding the pins out of the spring-loaded end cap. Some fittings have a clip or cover that needs to be unclipped first. Rotate the tube gently until you feel the pins align with the slots, then lower one end at a time. Keep the tube horizontal as you bring it down to avoid flexing the glass.
- 4
Fit the New Tube
Align the two pins at one end of the new tube with the slots in the holder, push in lightly, then do the same at the other end. Once both ends are seated, rotate the tube a quarter-turn in the direction that locks the pins — you will feel a small click or resistance when they are secure. Give the tube a gentle tug to confirm it is not loose before letting go.
- 5
Restore Power and Test
Turn the circuit breaker back on if you tripped it, then flick the wall switch. A new fluorescent tube may flicker briefly for the first few seconds while the ballast and starter warm up — this is normal. If it fails to light after 10–15 seconds, switch off immediately and check that the pins are fully seated and the tube specification matches the fitting.
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FAQ
- Can I replace a fluorescent tube with an LED tube without changing the fitting?
- Often yes, but it depends on the ballast. Type A LED tubes are designed to work with an existing compatible electronic ballast. Type B tubes require bypassing the ballast entirely, which involves a small wiring change inside the fitting. Check the LED tube packaging for ballast compatibility before buying, or choose a Type A/B hybrid tube that handles both.
- My new tube is the right size but it still won't light up — what should I check?
- First confirm the pins are fully engaged in both end caps. If they are, the starter (a small aluminium cylinder plugged into the fitting body) may have failed — starters are inexpensive and easy to swap by pushing, turning a quarter-turn anti-clockwise, and pulling out. If a new starter does not solve it, the ballast itself may need professional replacement.
- Where do I dispose of old fluorescent tubes in Greece?
- Fluorescent tubes are classified as hazardous waste because of their mercury content. In Greece, take them to a municipal recycling centre (Κέντρο Ανακύκλωσης) or a certified electrical-goods retailer that accepts lighting waste. The national scheme Φωτοδότης coordinates collection points across the country. Never break them or put them in general household waste.