SATCO Lighting S39915 14W T8 LED, 4Ft, 4000K, Medium Bi Pin Base, 50000 Avg Rated Hours, 1800 Lumens, Type B, Ballast Bypass

No. The S39915 is a Type B ballast bypass lamp, which means the fluorescent ballast has to be removed and line voltage wired directly to the sockets. It runs on 120V to 277V at 50/60Hz and accepts either single-ended or double-ended wiring, so it works with most socket arrangements once the ballast is out. If you want a true drop-in that runs off the existing ballast, you need a Type A lamp instead.

The S39915 puts out 1800 lumens on 14 watts, which is a lower output than a typical 32W fluorescent tube, so in a space where the fixtures were already at the edge of adequate light you may see a drop. It suits hallways, stairwells, storage, and multi-lamp troffer retrofits where you have two to four lamps per fixture. Satco rates it against a 75W incandescent. For higher output you want a higher-wattage T8 LED in the same family.

4000K is neutral or cool white, the common commercial standard for offices, corridors, and back-of-house, and it will read noticeably cooler than a 3000K lamp and warmer than 5000K. The S39915 is fixed at 4000K, not CCT selectable, so every lamp you order matches. Color rendering is 82 CRI. If your existing lamps are 3500K or 5000K, mixing in the same room will be visible.

Damp location rated, and listed for indoor or outdoor use, so a covered walkway, garage, or unheated storage area is within rating as long as the lamp is not exposed to direct water. It is not a wet location lamp. Burning position is universal, so it can be mounted horizontally, vertically, or base up without affecting performance.

No. The S39915 is not a three-way lamp and is a ballast bypass linear LED intended for line voltage switching at 120V to 277V. Put it on a standard on/off circuit. If the fixtures are on dimming controls, you need a lamp or fixture specified for that control type.

Average rated life is 50,000 hours. On a 12-hour-a-day, 7-day schedule that is roughly 11 years of service, which is why ballast bypass retrofits make sense for high-ceiling or hard-access areas even though the install takes longer than a drop-in lamp. There is no ballast left in the fixture to fail either, since the ballast is removed as part of the conversion.

Current draw is 0.117A down to 0.051A across the 120V to 277V range, the higher figure at the low end of the voltage range and the lower figure at 277V. At 14 watts a lamp, a 20A branch circuit carries a large number of these, which is the practical reason multi-fixture retrofits often end up with spare circuit capacity after the fluorescent ballasts come out.

Both the lens and the base are glass with a white housing. Glass-bodied linear LEDs handle heat well and will not yellow, but they break like a fluorescent tube does, so for gymnasiums, food prep areas, or anywhere a shatter-resistant lamp is specified you want a coated or plastic-bodied lamp instead.