Philips Lighting 927905783530 PL-C 18W/835/2P/ALTO 10PK

No, not if the fixture runs an electronic instant or programmed start ballast that expects a 4-pin lamp. The PL-C 18W/835/2P is a 2-pin lamp, which carries an internal starter and is built for magnetic preheat ballasts only. A 2-pin base will not seat in a 4-pin socket, and 2-pin lamps cannot be dimmed. If your fixture takes a 4-pin PL-C, you need the 4P version of the same wattage.

No. Each PL-C wattage uses a different pin/base keying and is matched to its own ballast, so an 18 watt 2-pin lamp is not a drop-in for a 13 watt or 26 watt socket. Philips offers the PL-C in 13, 18 and 26 watts, so order by the wattage printed on the lamp you are pulling out, and match the color designation too if you want the fixtures to look consistent.

It is sold as a 10 pack, which is why maintenance buyers standardizing a floor of downlights order it this way. All ten are the same 18 watt, 3500K, 2-pin ALTO lamp.

Rated average life is 10,000 hours. That rating assumes lamps are restarted no more often than once every three operating hours, so a stairwell or restroom on a short-cycle occupancy sensor will fall short of it, while a lobby or corridor left on for long runs will typically beat it.

Some, yes. The PL-C 18W holds 80 percent of its light output in a base-up position, which is the normal orientation in a recessed downlight. Philips rates the same 80 percent output across an ambient range of 55 to 127 degrees F, so unheated parking garages and cold vestibules below that band will read dimmer.

It is a compact quad tube built for downlights and wall washers in general lighting, and for wall sconces on the decorative side. The quad tube folds the arc into a short envelope, which is what lets an 18 watt lamp sit inside a small recessed can or a shallow sconce housing.

ALTO is Philips low-mercury lamp technology. For a facility or institutional buyer it matters at end of life, because that is the branding Philips puts on its reduced-mercury fluorescent line. Handle spent lamps through your normal lamp recycling program regardless.