Spot the 100W light bulb!
You'd probably find it among other 40W to 60W lamps quite easily with your naked eye - if you were at that place in person (you see a sort of storage rooms) but a limited dynamic range of a camera makes things more difficult. So... which one is it?
Correct! The bright circle on the ceiling betrays.
Btw. these fixtures are big enough for 150W or even 200W lamps but their socket would suffer from the heat going up.
Yeah I saw the circle and that's what tipped me off lol. Yeah they look pretty big. I guess the sockets could be changed for higher temperatures ones if needed.
There are ceramic sockets inside but the metallic contacts tend to lose their mechanical properties when exposed to heat for a few years. I'm not sure if there are sockets with contacts from a special alloy that would stand the heat better/longer...?
You said the metallic contacts loose their mechanical properties. I assume you meant the socket gets too hot? A pulse-rated socket for HID lamps is definitely designed to withstand extreme heat.
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Btw. these fixtures are big enough for 150W or even 200W lamps but their socket would suffer from the heat going up.
But yes - HID sockets need to be heat resistant.