SATCO Lighting S8778 20W LED A21, High lumen output, 4000K, Medium Base, 120V

Yes. The S8778 is an enclosed rated lamp, so it can go in a fully enclosed ceiling fixture, jar fixture, or glass globe without voiding its rating. It also carries a Damp location rating, which covers covered porches, soffits, and bathrooms, but not direct rain or wet exposure. Burning position is universal, so base up, base down, or horizontal all work.

Yes, on light output. The Satco S8778 draws 20 watts and is rated as a 150W incandescent equivalent, putting out 2747 lumens at 4000K. That is a cool, neutral white, noticeably whiter than the warm 2700K look of the incandescent it replaces, so if you are swapping one fixture in a room full of warm bulbs the color difference will show.

Yes, the S8778 is a dimmable lamp. It is not a three-way bulb, so do not put it in a three-way socket expecting three light levels. For dimming, use an LED-rated dimmer; older incandescent-era dimmers running a single 20 watt load often sit below their minimum load and cause flicker or drop-out.

4000K reads as neutral white, cleaner than the warm yellow of 2700K and without the blue cast of 5000K. It suits corridors, stairwells, garages, back-of-house, utility rooms, and retail where you want things to look crisp. For apartment living rooms and bedrooms where tenants expect a warm look, 4000K will feel cold. CRI is 80+, which is standard for general lighting but below what you would want for color-critical display work. This lamp is fixed at 4000K, not CCT selectable.

Beam spread is 280 degrees, so it throws light in nearly every direction rather than down in a cone. That makes it a fit for table lamps, open shades, wall sconces, and bare-socket utility fixtures where you want the whole room lit. If you need directional light into a work surface or a display, a reflector lamp such as a BR or PAR is the better choice. The frosted lens helps diffuse the source and soften glare.

Under a covered porch, soffit, or carport, yes. The lamp is rated for indoor and outdoor use with a Damp location rating, which means protected exposure to moisture. It is not wet rated, so keep it out of fixtures subject to direct rain, sprinkler spray, or standing water.

No. The S8778 is not DLC approved, so it will not qualify under rebate programs that require a DLC listing. It is FCC compliant for electromagnetic interference. If a rebate is driving the purchase, confirm which qualified products list your utility accepts before you spec the lamp.

Rated average life is 25,000 hours. Running continuously, that is a little under three years of service; on a 12 hour per day schedule it stretches to roughly five and a half years. For an MRO buyer planning a relamp cycle in common areas, that is the number to budget against.

Yes. The S8778 is noted as lawful for sale in California, so it can be specified on California jobs without running into state lamp restrictions.

The manufacturer part number is S8778 from Satco Lighting, a 20W LED A21 at 4000K with a medium base on 120V, frosted finish. Each lamp weighs 0.34 lb, which is the figure to use when estimating freight on case or pallet quantities. Country of origin is China.