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broadgage · 23rd Feb 2018, 3:33 am

I have somewhere an old brass BC lamp holder that is marked "max 660 watts" since AFAIK lamps with a BC cap were not generally available in more than 200 watts, the rating suggests that the makers allowed for plugging in other loads like electric irons.

I have also seen lamp holders marked "5 amps" possibly for the same reason, or perhaps to allow for the use of ELV lamps.
25 volt, 100 watt lamps certainly existed and would of course use about 4 amps.

23rd Feb 2018, 3:33 am	#27
broadgage Nonode Join Date: Jan 2010 Location: North Somerset, UK. Posts: 2,129	Re: Lamp adapter query. I have somewhere an old brass BC lamp holder that is marked "max 660 watts" since AFAIK lamps with a BC cap were not generally available in more than 200 watts, the rating suggests that the makers allowed for plugging in other loads like electric irons. I have also seen lamp holders marked "5 amps" possibly for the same reason, or perhaps to allow for the use of ELV lamps. 25 volt, 100 watt lamps certainly existed and would of course use about 4 amps.