SATCO Lighting S21376 4W T6.5 LED, Frosted, Double Contact Bayonet Base, 3000K, 360 Lumens, 120V

Yes. The S21376 uses a double contact bayonet base (DC bayonet, the push-and-twist style with two pins on the sleeve), so it drops into an existing DC bayonet socket without an adapter. If your fixture takes a single contact bayonet or a screw base, this is the wrong bulb.

Line voltage. The S21376 runs on 120V direct, so it wires into a standard building circuit with no low voltage transformer or driver in the fixture. If your existing lamp is a 12V or 24V bayonet type, do not substitute this one.

It runs 3000K, a soft warm white. That is warmer than a 3500K or 4000K neutral lamp and cooler than a 2700K incandescent-look bulb, so if a fixture run is currently 2700K you will see the S21376 read slightly whiter alongside them. For consistency across a corridor or a lobby, keep the whole run at 3000K.

4 watts drawing 360 lumens. In the T6.5 tubular bayonet format, that output sits in the range of the small incandescent indicator and cabinet lamps it is meant to swap out, at a fraction of the draw. Judge the swap on the 360 lumen figure rather than on wattage.

Order Satco S21376. That single number covers the lamp as built: 4W, T6.5 tubular, frosted, double contact bayonet, 3000K, 360 lumens, 120V. There are no size or color temperature variations to specify against it.

For any fixture on a 120V circuit with a double contact bayonet socket, yes. The T6.5 envelope is the compact tubular size, so the main thing to verify before committing to a bulk changeover is enclosure clearance in your tightest fixture and that none of the sockets are single contact. Color temperature is fixed at 3000K across the part, which is what makes it usable as a standard.

Frosted. The frosted glass diffuses the LED chips so you do not see hot points through the envelope, which matters in exposed applications like sconces, exit and step fixtures, or anywhere the lamp itself is in view. Frost is the only finish this bulb is made in, so there is no clear version of the same part number.