SATCO Lighting S39928 12W T8 LED, 3ft, 4000K, Medium Bi Pin Base, 50000 Avg Rated Hours, 1450 Lumens, Type B, Ballast Bypass

The S39928 is a Type B ballast bypass tube, so the fixture's fluorescent ballast comes out and line voltage goes straight to the sockets. It accepts either single-ended or double-ended wiring, so it works with whichever socket configuration the fixture already has. If you want a lamp that plugs into a working ballast with no rewiring, this is not it, you need a Type A tube instead.

No. Once a fixture is converted for the S39928, the ballast is removed and the sockets carry line voltage, which will destroy a fluorescent lamp and is a safety issue. Convert the whole fixture and lamp every socket in it with bypass tubes. In a multi-lamp fixture, all lamps go together.

4000K is neutral white, a clean look that reads slightly cooler than the warmer 3500K often used in offices and noticeably warmer than 5000K daylight. It is the common choice for corridors, back-of-house, retail stock rooms and shops. If you are relamping only part of a building, match 4000K across the whole space or the difference between fixtures will be obvious.

1450 lumens from 12 watts. A standard 3-foot T8 fluorescent is a 25 watt lamp, so you are cutting lamp wattage by roughly half, and you also drop the ballast draw entirely because the tube runs on line voltage. Rated life is 50,000 hours.

Order by the Satco MPN S39928 to keep every opening the same: 12W, 3ft T8, 4000K, 1450 lumens, medium bi-pin, Type B bypass. Because bypass conversion changes the fixture wiring, count fixtures and sockets, not just lamps, and plan on non-shunted or shunted lampholders to suit whether you wire single-ended or double-ended.

The S39928 carries a 50,000 hour average rated life. On a 12 hour per day schedule that is over 11 years of service, which is why bypass tubes get specified in high-ceiling and hard-to-reach fixtures where the labor to get a ladder up there costs more than the lamp.