SATCO Lighting S39913 14W T8 LED, 4Ft, 3000K, Medium Bi Pin Base, 50000 Avg Rated Hours, 1700 Lumens, Type B, Ballast Bypass

No. The S39913 is a Type B ballast bypass lamp, which means the fixture's fluorescent ballast must be removed or bypassed and line voltage wired directly to the sockets. Leaving the ballast in circuit will not run this lamp. It accepts single-ended or double-ended wiring, so it works with either rewiring approach, and it runs on 120V through 277V at 50/60Hz. If you want a lamp that works on the existing ballast, you need a Type A (plug-and-play) tube instead.

The S39913 accepts either wiring method. Double-ended puts line on one end of the fixture and neutral on the other, which is often the fewer-steps conversion on an existing strip fixture. Single-ended brings both line and neutral to the same lampholder, so the opposite end becomes a non-powered support; it is the safer choice during relamping because only one socket is live. Either way the ballast comes out and shunted versus non-shunted tombstones matter, so plan the socket change into the job. Lamp runs on 120V-277V at 50/60Hz, and it is FCC compliant.

The S39913 puts out 1700 lumens at 14 watts, which Satco rates as a 75W incandescent equivalent. That is below the output of a typical 32W F32T8 fluorescent, so in a space where light levels matter (a shop bench, a garage, task areas) a single-tube swap will read dimmer. In multi-lamp troffers across an office or corridor it usually reads fine. Beam spread is 210 degrees, so the light throws wide rather than down a narrow cone.

The S39913 carries a damp location rating and is listed for indoor or outdoor use, so a covered, unheated area such as a parking deck, a canopy, or a stairwell is within its rating as long as the fixture itself is rated for that location and the lamp is not exposed to direct water or jets. Damp is not wet, so a hose-down or rain-exposed position needs a wet-rated enclosure.

Rated life is 50,000 average hours. At roughly 12 hours a day that is over a decade of service, which is why facilities crews standardize on these to get off an annual fluorescent relamp cycle. Current draw is 0.117A at 120V down to 0.051A at 277V, so a four-lamp troffer pulls under half an amp on a 120V branch circuit and you can load a lot of fixtures per 20A circuit.

No. The S39913 is not a three-way lamp, and as a ballast bypass tube it is wired straight to line voltage. Put it on a standard on/off switch or a relay. If the space needs dimming, specify a dimmable LED tube with a compatible driver and control, not this one.

Yes. Burning position is universal, so the S39913 can be installed horizontally, vertically, or at an angle without affecting operation or rated life. That matters for stairwell and wall-mount strip fixtures where the tube is not lying flat.

The S39913 uses a glass lens and glass base material, with a gloss white finish and a white housing. Glass tubes handle heat well and will not yellow the way some plastic lenses do, but they break like a fluorescent tube, so for gyms, school corridors, or anywhere impact is a concern a plastic or coated-glass tube is the safer pick.

Yes, the S39913 is marked lawful for sale in California, so it clears the state's lamp regulations for distribution and installation there.