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I need to replace the ceiling-fan light-bulbs in my living room in North America, there's a standard-looking 3-light-bulb installation with the fan, and each of the three sockets are only marked "660W 250V", without the designation of what the final appliance accepts. The prior owner left me with one working CFL and two burned out incandescents (one 40W, another 60W). The light cover is made from glass, and is tulpan/cone like (looks very similar to http://www.amazon.com/Westinghouse-Lighting-7781400-Three-Light-Ribbed-Glass/dp/B003KQLJJW, and these are probably supposed to be spec'ed for 60W incandescents).

Can I install two A19 72W halogen 100W-incandescent-replacement bulbs to replace the burned out 40W and 60W incandescent light bulbs? After all, the sockets are marked 660W 250V each — I'd only be using 72W 120V out of them, way below the electrically-advised spec.

cnst
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    How does a socket look like 60W? – DMoore Feb 19 '14 at 19:45
  • @DMoore, from prior empirical experience, it looks just like all those other light fixtures that had a 60W marking on them. – cnst Feb 19 '14 at 20:16
  • Often the entire fixture might have 660W 250V on it but the individual lighting fixtures may have another marking. I was wondering if you said 60W because you saw another marking. – DMoore Feb 19 '14 at 20:26
  • Since you don't know the max wattage, and it "looks" like a 60W socket, I wouldn't go with bigger bulbs. The actual limit could be 40W, so the 72W bulbs are almost twice that - the limit may not be there because of the socket, but because of light gauge wire used internally. If you need more light, I'd look at using an LED or CFL. – Johnny Feb 19 '14 at 20:43
  • @DMoore, no, as I said, "660W 250V" is the marking on *each* of the 3 individual sockets, each. There are no visible marking on the fixture itself. – cnst Feb 19 '14 at 20:53
  • @Johnny, I highly doubt it'd be 40W -- the cover is made out of glass, these would not be limited to just the 40W (usually only non-glass ones are), and I have a feeling that a 72W halogen would have an almost equal amount of heat as a 60W banned-by-the-end-of-the-year incandescent, since it produces almost twice as much light (leaving less power for heat). – cnst Feb 19 '14 at 20:57
  • If you're sure that the socket can handle the heat of the larger bulb (despite not know what the manufacturer limit is), then the only question is whether or not the wiring is up to the task. Some ceiling fans may limit total lighting wattage to [190 watts](http://diy.stackexchange.com/a/16083/12620) – Johnny Feb 19 '14 at 21:12
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    The 660W 250V is the rating of the socket itself, not the fixture that it is installed in. Fixtures are made from stock parts, each of which has its own limits. Those individual ratings have nothing to do with how much the assembled fixture can handle, which is limited to its *weakest* components and often mostly heat buildup. – bib Feb 19 '14 at 21:32
  • @bib, exactly, and I'm just trying to figure out whether 72W halogen would be ok in place of a 60W incandescent. – cnst Feb 19 '14 at 21:59
  • Would I just use the 72W halogens? Yes. I know they emit about 30% less heat than incandescent which puts me well under 60W equivalent. But next time these needed to be changed out I would buy CFLs. – DMoore Feb 20 '14 at 05:07
  • @DMoore, well, they're 28% more efficient, presumably in the W/lm metric, compared to incandescents; I'm not exactly sure it's the same as producing "30% less heat", is it? – cnst Feb 20 '14 at 14:59
  • @DMoore - a 72W halogen emits 30% less heat than a 100W incandescent, but it emits about 20% more heat than a 60W incandescent. A standard incandescent is only about [2% efficient](http://en.wikipedia.org/wiki/Luminous_efficacy#Examples_2) at converting electricity to light, so even if a halogen is 30% more efficient than a standard inscandescent, it's still converting nearly all of its energy to heat. If the socket is rated for a 60W incandescent, I wouldn't put a 72W Halogen bulb in the socket, since it will be running about 20% hotter than it is rated for. – Johnny Feb 20 '14 at 23:20
  • @Johnny - depends on the halogen bulbs. The new generation ones are supposed to emit much less heat. This is really impossible to answer without getting the exacts on the bulb from manufacturer. – DMoore Feb 20 '14 at 23:28
  • @DMoore - A new 72W Halogen is rated to emit the same amount of light (lumens) as a 100W incandescent, making it around 30% more efficient than the old incandescent. So instead of turning 2.5% of watts into light, it turns around 3.5% of watts into light. So that 72W Halogen bulb is still emitting around 70W of heat. – Johnny Feb 21 '14 at 00:09
  • 1k views today, yet still 0 votes! "welcome to stack overflow!" – cnst Jul 24 '16 at 16:50

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If the fan light fixture is newer and meets EPAct05 compliance then there will be a circuit in place to limit the total power to 190W. Exceeding that total wattage should cause the circuit to interrupt the current. I believe the circuit should reset itself when power is removed, load reduced, and power restored.

However, I had one fan light fixture for which I had installed CFLs. The fixture wasn't rated for CFL use and the EPAAct05 prevention device got fried and permanently opened.

EPA Standards for Ceiling Fan Light Kits

Tom S
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  • Interesting info. Also, I was shopping for light bulbs yesterday, and was surprised that big Kmart still has stock of A15 for fans that don't have lumen ratings -- shows how stale their inventory is. :-) – cnst Feb 22 '14 at 14:50
  • The 190W rule only applies to torchieres and fan lights. I've never heard of a device which limits power to 190W, but on the other hand most torchieres and fan fixtures have dimmers, so Congress' intent may have been that this circuit should be built into the dimmer. CFLs don't play well woth dimmers, unless they are engineered to. – Harper - Reinstate Monica Nov 11 '17 at 00:58
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bulbs should be rated for a ceiling fan or they will burn out fast from the vibrations.
I have seen sockets with a high rating like that but that is just for the socket and not the fixture or wiring. There should be markings some place else but it maybe be just a sticker that has already fallen off. It probably is 60watts some are only 40watts. You probably shouldnt use 72watts just to be safe but also because its probably to rated for a ceiling fan and will be a waste of money.

Justin K
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