Ushio 40W 2G11 4-Pin 3500K Fluorescent Standard Bulb

Compact Fluorescent Lamp for Low-Profile Fixtures

The Ushio 40W 2G11 4-Pin 3500K Fluorescent Standard Bulb is a compact fluorescent lamp designed for low-profile fixtures needing high output. It delivers 3150 lumens at 87 lumens per watt with an 82 CRI tri-phosphor coating for good colour rendering. The single-tube design suits commercial and residential installations where space is limited. Rated life is 12000 hours average.

2G11 Four-Pin Base and Ballast Compatibility

The lamp uses a 2G11 four-pin base that plugs directly into matching sockets without screw threads. It operates on both instant start and rapid start electronic ballasts, so existing control gear often remains usable. The ULTRA-L series construction keeps the tube diameter small, allowing the lamp to fit slim recessed housings and cove lighting channels. No integrated starter or ballast is present.

Check Fixture Socket and Ballast Type Before

Verify the fixture accepts a 2G11 four-pin base; two-pin or other four-pin bases will not seat correctly. Confirm the installed ballast is labelled for instant start or rapid start operation with 40W compact fluorescent lamps. Buyers who need a different colour temperature, higher CRI, or a screw-base retrofit cannot use this lamp. Ensure the fixture’s maximum wattage rating meets or exceeds 40W.