SATCO Lighting S8531 9W LED PL 2-Pin, 3000K, 950 Lumens, G24d Base, 50000 Avg Rated Hours, Horizontal, Type B, Ballast Bypass

Yes. The S8531 is a Type B ballast bypass lamp, so the fixture has to be rewired to run line voltage directly to the sockets and the existing CFL ballast taken out of the circuit. Drop it into a fixture with a live ballast and it will not run correctly. If you want a lamp that plugs into a working ballast with no rewiring, you need a Type A (ballast compatible) PL lamp instead.

No. The S8531 has a G24d 2-pin base, which only seats in a 2-pin G24d socket. A 4-pin fixture uses a G24q socket and the keying will not accept this lamp. For a 4-pin can or sconce you need the 4-pin version of the PL lamp, not this one.

It is specified for horizontal orientation. The 120 degree beam angle is thrown off the side of the lamp, so in a horizontal-burn fixture such as a wall sconce, stairwell fixture, or horizontal can it puts light where you want it. Mount it base-up in a vertical downlight and the output goes out the sides of the can rather than down through the aperture.

At 9 watts and 950 lumens, the S8531 covers the output range of the common 18W and 26W 2-pin compact fluorescent PL lamps used in commercial sconces and downlights. The draw drops to 9 watts per socket, and rated life is 50,000 hours, which is what makes the rewire worth doing across a building full of fixtures.

The S8531 is 3000K, a warm white. If your corridors and units are already running 3000K lamps it will blend in. It will read noticeably yellower next to 3500K or 4000K neutral lamps, so if the rest of the property is on 4000K, order the 4000K version of the PL lamp instead of mixing them in the same space.

Converting a fixture for the S8531 means opening the fixture, removing the CFL ballast, and landing line voltage on the sockets. That is line-voltage work on the fixture wiring, so it typically falls to a licensed electrician rather than general maintenance, and existing sockets should be confirmed as rated for direct line voltage before the lamp goes in.

Treat it as non-dimming. The S8531 is a ballast bypass PL lamp run straight off line voltage, with no dimming function stated for it. If the fixture is on a dimmer circuit, either take the fixture off the dimmer or specify a lamp that is explicitly rated for dimming.

Frost. The frosted lens diffuses the LED array so you do not get visible diode hot spots through an open-bottom fixture or a clear lens, which matters in sconces where the lamp is in view.