SATCO Lighting S21335 8W BT15 LED, Clear, Medium Base, 90 CRI, 4000K, 120V

Yes. The S21335 is an enclosed rated lamp, so it can run inside a closed globe, jar fixture, or sealed vanity shade without voiding the rating. It also burns in any position (universal burning position), so base-up, base-down, or horizontal sockets are all fine.

It is rated for indoor and outdoor use, with a wet location rating, so exposed porch lights, post lanterns, and open soffit fixtures are within spec. Standard 120V medium base socket.

Yes. At 8 watts it puts out 800 lumens, which is the 60W incandescent equivalent, so light output stays the same while draw falls to 0.067 amps on a 120V/60Hz circuit. Useful when you are reloading a lot of sockets on one branch circuit.

No. The S21335 is a fixed 4000K neutral white and is not CCT selectable, so it will read noticeably cooler and whiter next to 2700K or 3000K lamps. Use it where the whole room or the whole run is being changed over, such as corridors, laundry rooms, and stairwells. For a warm-toned lobby or guest room, order the warmer color temperature of the same lamp instead.

The lamp is dimmable on 120V. It is an LED filament lamp, not an incandescent, so pair it with an LED-compatible (electronic low-voltage or LED/CFL rated) dimmer; older magnetic incandescent dimmers are the usual cause of flicker and limited low-end range. It is not a three-way bulb, so it will not step in a 3-way socket.

A clear BT15 shows the LED filaments, which is what you want in exposed-socket fixtures: Edison pendants, open chandeliers, cage sconces, bath bars with the bulb visible. The 300 degree beam spread throws light nearly all the way around rather than forward like a reflector lamp. If the bulb is hidden behind a shade or sitting in a recessed can, a frosted A-shape or a reflector lamp is the better buy, since the decorative filament is wasted and the clear glass can show glare.

The S21335 is 90 CRI, which is the threshold most hospitality, healthcare, and retail specs call for when color accuracy matters, finishes, skin tone, and merchandise all read truer than under a typical 80 CRI lamp. Paired with the fixed 4000K neutral white, it suits exam areas, back-of-house, and display lighting where you want crisp white rather than warm.

It is Title 24 compliant and FCC compliant, so it can be used where California energy code applies. It is not DLC approved, so it will not qualify under rebate programs that require a DesignLights Consortium listing. Check your utility's program, many residential lamp rebates work off ENERGY STAR or Title 24 rather than DLC, which is a commercial fixture list.

Satco Lighting S21335 is the part number: 8 watt BT15 LED filament, clear glass, medium base, 90 CRI, 4000K, 120 volt. Clear is the only finish this lamp is built in, so the MPN alone pins down the order.

Rated average life is 15,000 hours. On a 12 hour per day corridor or exterior schedule that works out to roughly three and a half years between relamps, which is why property managers standardize on one lamp across a building rather than chasing one-off replacements.

Glass with a nickel plated aluminum base. Each lamp weighs 0.055 lb, so even full-case quantities of the BT15 add almost nothing to a freight line, it ships as a volume item rather than a weight item.