SATCO Lighting S8779 20W LED A21, High lumen output, 4000K, Medium Base, 120-277V

No. The S8779 is a non-dimmable lamp, so it should only go on a standard on/off switch circuit. Putting it on a dimmer can cause flicker, buzz, or premature failure. It is also not a three-way bulb, so it will not step through levels in a three-way socket (it will typically just run at full output on one contact).

Yes on light output. The S8779 draws 20 watts and puts out 2828 lumens, which Satco rates as a 150W incandescent equivalent. Color is 4000K cool white, so if you are swapping out warm 150W incandescents the light will read noticeably whiter, not just brighter. CRI is 80+.

Yes. The S8779 is an enclosed rated lamp, so it can go in closed globes, jelly jars, and sealed ceiling fixtures where a non-enclosed-rated LED would overheat. Burning position is universal, so base-up, base-down, or horizontal all work.

Yes. The S8779 is a 120V-277V lamp at 50/60Hz, so the same bulb works on standard 120V residential circuits and on 277V lighting branch circuits in commercial buildings. Current draw runs 0.167A at the low end of the voltage range down to 0.072A at the high end. That single-SKU range is why facilities crews use it to standardize stock across mixed-voltage buildings.

It is rated for indoor and outdoor use, but only in damp locations. That covers covered porches, soffits, breezeways, and enclosed outdoor fixtures where the lamp is shielded from direct rain. For an open fixture taking direct water exposure you need a wet-location-rated lamp instead.

4000K is neutral to cool white, the usual pick for warehouses, corridors, stairwells, parking structures, and back-of-house areas where you want crisp task light. It is not a CCT-selectable lamp, so 4000K is fixed. If you are relamping guest rooms, lobbies, or apartment interiors where residents expect warm light, a 2700K or 3000K lamp is the better match.

No. The S8779 is not DLC listed, so it will not qualify under rebate programs that require DesignLights Consortium listing. It is FCC compliant, and Satco notes it as lawful for sale in California. If a utility incentive is driving the project, verify the program's qualified products list before you spec it.

Beam spread is 280 degrees, so it distributes nearly all the way around like an omnidirectional incandescent rather than throwing a narrow cone. The lamp is lensed with a frosted finish, which diffuses the diodes so you do not get hot spots or visible LED points in open or bare-socket fixtures.

Average rated life is 25,000 hours. Running continuously that works out to roughly 2.9 years; on a 12-hour-a-day schedule it is closer to 5.7 years. That is the figure MRO buyers use to set relamp cycles and stocking quantities.