SYLVANIA 20591 FT55DL/835 55W 3500K 4800lm 2G11 standard bulb

55W 2G11 fluorescent tube

This 55 watt compact fluorescent lamp uses a 2G11 four-pin base and delivers 4800 lumens at a 3500K colour temperature. It is built for electronic ballasts in commercial or residential fixtures that accept a long single-tube shape. The 82 CRI rating provides acceptable colour rendering for general lighting tasks. Rated life reaches 12000 hours under normal switching cycles.

Electronic ballast compatibility

The lamp requires a compatible electronic ballast matched to 55 watt operation; it will not start on magnetic or mismatched gear. Its 21.1 inch overall length determines the minimum fixture cavity depth, so installers must verify housing dimensions before purchase. The four-pin 2G11 base plugs directly into the corresponding socket without adapters, simplifying replacement in existing troffers or downlights. No separate starter or capacitor is needed when the correct ballast is present.

4800 lumen output headroom

At 4800 lumens the tube suits offices, corridors and retail areas where medium illuminance levels are specified. The 3500K neutral white tone balances warmth and clarity for tasks such as reading or merchandise display. Output will gradually decline over the 12000 hour rating, so relamping schedules should anticipate reduced foot-candles near end of life. Spaces demanding higher lumen packages or dimming below ten percent will need alternative lamp types or LED retrofits.