SATCO Lighting S18403 4.5W LED PL 2-PIN, 4000K, 450 Lumens, G23 Base, 360 degree Beam Angle, Type B, Ballast Bypass

The S18403 is a Type B ballast bypass lamp, which means the existing fluorescent ballast must be removed and line voltage wired directly to the lamp sockets. It will not operate on an existing magnetic or electronic PL ballast. The driver is onboard and accepts 120V through 277V at 50/60Hz, so the same lamp works on either common commercial circuit voltage. Plan on an electrician for the rewire in each fixture.

No. The S18403 is non-dimmable and has no three-way function. On a dimmer circuit expect flicker, buzz, or no start at all. If the fixture is on a dimmer, either replace the dimmer with a standard switch or pick a lamp specified as dimmable.

Yes on both counts. It carries an enclosed rated lamp designation, so it can go in a sealed or gasketed housing without voiding the rating, and it is rated for damp locations such as a covered exterior soffit, a shower area, or a garage. Damp is not wet, so keep it out of fixtures exposed to direct water spray.

At 4.5 watts the lamp puts out 450 lumens, equivalent to a 40W incandescent. That output lands it in the range of a 9W to 13W 2-pin CFL for light level, so it is a straight swap in low-wattage PL fixtures like stairwell cans, wall sconces, and under-cabinet housings. Current draw is 0.038A to 0.016A depending on supply voltage, which matters if you are loading up a circuit with a large lamp count.

No. Burning position is universal, so the lamp can run base up, base down, or horizontal with no effect on rated life. The beam spread is 360 degrees, which suits the diffused, all-around light a PL fixture is built for, and the frosted lens keeps the source from showing hard hot spots through a diffuser.

4000K is neutral white, cooler and cleaner-looking than the 2700K to 3000K warm white common in residential and hospitality spaces, and warmer than 5000K daylight. It is the usual choice for corridors, stairwells, restrooms, and back-of-house in commercial and multi-family buildings. Color rendering is 80 CRI, and the color temperature is fixed, not field selectable, so order all lamps in a shared space at the same CCT if you want them to match.

No. The S18403 is not DLC listed, so it will not qualify under utility programs that require DesignLights Consortium listing. It is FCC compliant for electromagnetic interference. If a rebate is driving the project, specify a DLC-qualified lamp instead.

Average rated life is 50,000 hours. On a 12-hour-per-day corridor or stairwell schedule that is roughly 11 years of service, which is the main reason property managers convert PL cans to ballast bypass LED rather than restocking CFL tubes. The fixture rewire is a one-time cost per housing.

Body and base are plastic with a white housing, and the lens is frosted polystyrene. There is no glass tube to break, which is a practical advantage in stairwells, laundry rooms, and tenant spaces where a dropped lamp is common. Plastic construction also means no mercury to handle on disposal, unlike the CFL it replaces.

Order Satco Lighting S18403. It is a single configuration: 4.5W, 4000K, 450 lumens, G23 2-pin base, frost lens, Type B ballast bypass. There are no wattage or color temperature variations under this number, so the part number alone fully specifies the lamp.