SATCO Lighting S49978 14W, 4 Foot LED T8, Medium Bi Pin Base, 5000K, 50000 Avg Rated Hours, 2200 Lumens, Type A, Ballast dependent

Yes. The S49978 is a Type A, ballast dependent LED T8, which means it runs off the fluorescent ballast already in the fixture. You drop it into the existing medium bi-pin tombstones, no rewiring and no ballast bypass. The trade-off is that the lamp only works as long as that ballast works, and it has to be a compatible instant-start or programmed-start electronic ballast. If the ballast is already failing, a Type B (direct wire) lamp is the better call because it removes the ballast from the system entirely.

It will. The lamp is 48 inches long with a medium bi-pin base at each end, the same form factor as a standard 4 foot F32T8 fluorescent tube, so it seats in 4 foot strips, wraps, and 2x4 troffers built for T8.

The S49978 draws 14 watts and puts out 2200 lumens at 5000K. A 32 watt T8 fluorescent is typically in the 2800 to 2950 lumen range, so expect somewhat less raw output per lamp at well under half the wattage. In a two or four lamp troffer in an office, corridor, or back-of-house space that usually reads fine, but for a task area where you are already short on light, a higher lumen lamp is the safer choice.

5000K is a crisp, daylight-white color, noticeably cooler and bluer than the 3500K or 4100K tubes common in older office installs. If the rest of your building is lamped at 4100K, mixing in the S49978 will be visible from across the room. For a fleet retrofit, relamp a whole space or a whole floor at one color temperature rather than swapping tube by tube. Color rendering is 80+ CRI, which is standard for commercial linear lighting.

It is listed as dimmable, but as a Type A ballast dependent lamp the dimming is governed by the fluorescent ballast in the fixture. You need a dimming ballast and a matched control already in place. On a standard non-dimming instant-start ballast the lamp will simply run at full output.

The S49978 has a glass body. In a warehouse aisle, a gym, a school corridor, or anywhere with lift traffic or ball impact, a glass tube is more vulnerable than a coated or plastic-bodied lamp, and shattered glass over a food or production area is a real problem. For those locations specify a shatter-resistant or plastic-body T8. For offices, corridors, and standard commercial ceilings glass is not a concern.

Rated life is 50,000 average hours. At roughly 12 hours a day that is about 11 years of service, which is why most MRO groups relamp a whole fixture at once rather than chasing individual failures. Keep in mind that because this is a ballast dependent lamp, your service interval in practice is set by whichever fails first, the lamp or the existing fluorescent ballast.

Order by Satco part number S49978. Each lamp weighs 0.41 lb, which matters if you are palletizing a multi-case relamp order for a building. The tube is finished gloss white.