How to find the right Fluorescent Tubes AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Fluorescent Tubes
- Tube diameter
- The T number is the diameter in eighths of an inch (T5 is 5/8 inch, T8 is 1 inch, T12 is 1.5 inch); match it to the fixture and ballast T8 and T12 share the G13 bi-pin base but need different ballasts, and T5 uses the smaller G5 base.
- Color code
- In codes such as 841 or 835, the first digit gives the CRI decade and the last two give color temperature (841 is CRI 80s at 4100K) This lets you match existing tubes in a room.
- Length and wattage
- Match nominal length (for example 48 inch) and lamp wattage to the ballast label Wrong lamps shorten ballast and lamp life.
- LED tube type
- Type A plugs into the existing ballast, Type B requires bypassing the ballast, Type A/B works either way Type B rewiring removes ballast failures but must be done to the tube's wiring diagram.
Brands that matter
- Philips: Alto low-mercury fluorescent tubes.
- Sylvania (Ledvance): Octron T8 tubes.
- GE: Long-standing fluorescent tube range.
What to avoid
- Installing T12 tubes on T8 electronic ballasts or the reverse
- Putting a ballast-bypass LED tube into an unmodified fixture
- Disposing of fluorescent tubes in regular trash
Questions
Why are T12 tubes hard to find?
Efficiency regulations removed most T12 lamps from production, so converting the fixture to T8 or LED is usually the better route.