SATCO Lighting S8544 5 Watt/15 Watt/21W, A21 LED, 3-way, Frosted, 4000K, Medium Base, 120V

Yes. The S8544 is a true 3-way A21 LED with a medium base, so in a 3-way socket and turn-key switch it steps 5W, 15W, 21W, putting out 600, 1600 and 2150 lumens. Drop it in a standard single-circuit socket and you only get the lowest level, since the center contact never gets switched.

No. The S8544 is non-dimmable. It changes level through the three-way socket switch only. On a dimmer you risk flicker, buzz and early failure, so wire it to a standard on/off or a 3-way turn-key socket instead.

4000K is a neutral white, noticeably crisper than the 2700K soft white most residential table lamps use. It reads well in corridors, lobbies, laundry and back-of-house areas, and in reading lamps where you want contrast. For guest-room or apartment living-room lamps where tenants expect warm incandescent color, a 2700K or 3000K 3-way is the closer match. The frosted finish keeps the diodes from showing through an open-top shade.

The S8544 is a 120 volt lamp. It is for standard line-voltage 120V residential and commercial sockets only. For 277V lighting circuits in a commercial building you need a lamp rated for that input; do not install this one.

Each lamp draws 5W, 15W or 21W depending on the step, against roughly 50/100/150W for the incandescent 3-way it replaces, while still delivering 600/1600/2150 lumens. On the top step that is about a seven-to-one reduction in draw. Because the bulb is non-dimmable, confirm none of the lamps in the units are on dimmer sockets before standardizing.

80+ CRI covers general residential and commercial use, including guest rooms, corridors and offices. Color rendering at that level is fine for everyday tasks. Where color judgment matters, such as retail merchandise display, paint matching or a salon, specify a 90+ CRI lamp instead.

Order Satco S8544. It ships in one configuration, a frosted A21, 4000K, medium base, 120V, 5/15/21W. Country of origin is China.