SATCO Lighting S21805 9.8W, A19 LED, 3000K, Candelabra Base, 220 degree Beam Angle, 120V

It needs a candelabra socket, not a standard medium one. The S21805 is an A19-shaped LED lamp with a candelabra base, which in North America is the E12 screw base used in chandeliers, sconces and decorative fixtures. The A19 refers to the bulb's shape and size, not the socket, so this one will not thread into the medium base sockets found in most recessed cans and table lamps.

3000K, which is the warm white end of the neutral range, a little crisper than the 2700K soft white most incandescents produced. If the rest of the fixtures in a lobby or corridor run at 3000K, this lamp will read the same; mixing it into a run of 2700K lamps shows a visible difference in a shared sightline. Standardizing a whole floor on one color temperature is the usual fix.

Straight 120 volt line voltage, so it goes directly into the existing socket with no transformer or remote driver. Anything wired for low voltage, such as a 12V or 24V decorative system, needs a different lamp.

220 degree beam angle, so it throws light nearly all the way around and back past the base rather than casting a cone forward. That suits open chandeliers, wall sconces and shaded fixtures where light needs to come off the whole bulb. For a directional wash on artwork or a narrow beam down a wall, a reflector lamp with a stated narrow beam is the better choice.

Frost. The frosted finish diffuses the LED sources inside so you do not see hot spots through the glass, which matters in open fixtures where the bulb is visible. If the fixture is a decorative one meant to show a filament, a clear lamp is what you want instead.

Satco Lighting S21805 is the manufacturer part number, covering the 9.8 watt A19 LED at 3000K on a candelabra base, 120 volt, in the frost finish. There is one configuration, so no suffix or option code has to be added when ordering.