SATCO Lighting S16504 LED Circline, 16W, T9, 4000K, G10Q Base, 120-277V, Type B, Ballast Bypass

No. The S16504 is a Type B ballast bypass lamp, which means it runs on line voltage direct to the sockets. The existing magnetic or electronic ballast has to be removed or bypassed and the socket wired straight to 120-277V. Drop it into a ballasted fixture as-is and it either won't light or won't last. Budget the rewire time per fixture before you commit to a building-wide swap.

Yes, the base is G10q four-pin, the standard circline socket, and the lamp is a T9 shape. If the fixture you are pulling from has a four-pin G10q holder, the lamp seats in it. What still has to be checked is the ring diameter of the old lamp against the fixture opening, and the ballast bypass wiring.

No. The S16504 is non-dimmable and it is not three-way. Wire it to a plain switched circuit. If the fixture is on an existing dimmer or a three-way arrangement feeding a dimmer, the lamp can flicker or fail early, so the dimmer has to come out first.

Yes, it is an enclosed rated lamp, so a closed drum, a schoolhouse globe, or a covered ceiling pan is fair use. It also carries a damp location rating, so covered porches, bathrooms, and laundry rooms are in scope. Wet locations, direct rain, or sprayed-down areas are not.

At 16 watts the lamp delivers 1760 lumens, which Satco rates as a 100W incandescent equivalent. For property managers replacing a 22W or 32W fluorescent circline in a kitchen or hallway ceiling fixture, that is a real drop in connected load, and current draw runs 0.133A at 120V down to 0.058A at 277V.

The S16504 is fixed at 4000K, a neutral white, with 80 CRI. It is not a CCT selectable lamp, so there is no field switch to bring it to 3000K or 5000K. If the adjacent fixtures in a corridor or unit are running warm white, mixing this in will read visibly cooler side by side. For fleet work, standardize the whole run on one temperature.

Burning position is universal, so the lamp can run in any orientation: ceiling flush, wall sconce, or inverted in a pendant. No position derating to work around when you are specifying across mixed fixture types in a facility.

Yes, the S16504 is Title 24 compliant and FCC compliant. Worth noting for spec work: it is not DLC listed, so if a utility rebate program on your project requires a DLC qualified product, this lamp will not carry that particular claim.

Yes. The S16504 runs the full 120-277V range at 50/60Hz, so one part number covers apartment kitchen fixtures on 120V and 277V commercial corridor lighting. That is one SKU to stock instead of two, which matters when a maintenance shop is carrying lamps for a mixed portfolio.

Rated life is 50,000 hours. On a common area fixture burning 12 hours a day that is over eleven years of service, which is the argument for absorbing the one-time ballast bypass rewire on the first visit rather than continuing to restock fluorescent circlines.

The lamp has a frosted lens and a 135 degree beam spread, so light comes off the ring diffused and wide rather than as a bare point source. The housing is white. In an open globe or a shallow pan where the lamp is partly visible, that frost is what keeps the LEDs from reading as individual dots.

Satco Lighting part number S16504, the 16W 4000K LED circline with the G10q base, comes one way: frost finish. There is no separate color temperature or finish choice to specify on the order. Give a distributor the S16504 designation and there is no second decision to make.