Can you put a 100W LED in a 60W fixture?

The sticker inside a fixture says something like Maximum 60W. The box of the LED you are holding says 100W equivalent. They look like the same measurement and they are not, which is the whole of this question.

The fixture's number is about power actually drawn, and therefore about heat and the current in its wiring. Waveform Lighting states the reason directly: the maximum wattage specification exists to reduce the risk of fire caused by too much wattage being carried through the socket's wiring, and from the heat released by an incandescent bulb.

The LED's number is a brightness comparison for shoppers who still think in incandescent terms. PacLights puts it as plainly as anyone: a 10-watt LED may be labeled equivalent to a 60-watt incandescent in terms of brightness, but the wattage of the LED bulb itself is still only 10 watts.

So a 100W-equivalent LED drawing 13 to 16 real watts is, in the only sense the fixture cares about, a 16 watt bulb.

Two situations deserve care, and both are about heat having nowhere to go.

Enclosed fixtures. LEDs run cooler than incandescents - Waveform puts it at about 15 percent of the heat - but they are not cold, and an LED's electronics are more heat-sensitive than a filament ever was. PacLights notes that a fixture not designed to dissipate heat can overheat even with lower wattage bulbs, and Philips Hue tells owners to avoid enclosed fixtures unless the bulb is rated for that use. The fix is a bulb with a published enclosed rating - see best LED bulbs for enclosed fixtures.

Old fixtures with old wiring. ESFI's safety booklet says a bulb of too high a wattage or of the wrong type may lead to fire through overheating, and that some ceiling fixtures and recessed lights can trap heat. Its instruction is to use a bulb of the correct type and wattage, and to contact the manufacturer if you do not know what that is. With an LED you are usually far under the limit, which is precisely why the swap is safe.

Worth noting that not every source phrases it the same way. Lamps Plus's bulb FAQ states flatly that you should never exceed a fixture's maximum wattage, without separating actual watts from equivalence. Read strictly, that would rule out a swap every other source considers safe - so check the actual wattage on the Lighting Facts panel and stay inside the rating, and everyone agrees.

The practical upshot is that a fixture labeled 60W maximum can usually carry far more light than it ever did, because the limit was written for filaments.

A 100W-equivalent A19 in a 60W fixture is the standard example: about 1,500 lumens where the original bulb gave 800, from a bulb drawing well under the sticker's limit. In a dim hallway or a single-fixture bedroom that is the cheapest upgrade available.

An enclosed-rated 100W equivalent for sealed fixtures covers the exception above: the same brightness gain in a flush mount or a globe, from a bulb whose maker publishes the enclosed rating.

A brighter BR30 in a recessed can is the same trick in a ceiling: 850 lumens where a tired old flood might be giving 500, at 11 actual watts.

The limit you will hit first is not electrical. It is glare - see when LED lights are too bright.

If the bulb is not rated for the fixture it is going in. Enclosed, damp, recessed or appliance ratings are published for a reason, and they are the ones to respect rather than the wattage line.

If the fixture or the socket looks scorched. Discoloration around a socket is a sign it has already been over-lamped or is failing. That is an electrician question, not a bulb question.

If it is an appliance socket. Ovens, microwaves and range hoods have their own rules, and the appliance maker's manual overrides everything here - see the best appliance bulbs.

If the room is already bright enough. The reason to fit a brighter bulb should be that the room is short of light, not that the fixture can take it.