Use a 750W bulb in a 575W Fixture?

A 575W Source Four unit is only UL tested and certified safe for a 575W lamp and lower.

mmeskill said:

A 575W Source Four unit is only UL tested and certified safe for a 575W lamp and lower.

As well, the 750w lamp has a third pin specifically so it cannot be used in a 575w rated fixture, whose socket does not accept the 750w lamp, so simply buying the lamps will not work.

There has however, been talk across the forums over the years as to whether a 575w fixture can be UPGRADED to accept a 750.  Besides the socket, the lamp cap is different, so that might need a swap out, but as question to ETC folks, what else, *if anything*, is required to upgrade the 575w fixture ?.

Good question Steve. I'm fairly sure you can buy and replace just the end-cap of a S4. So no need to get a whole new unit. We will see if someone else jumps in otherwise I'll ask around at work tomorrow.

There's actually a Wiki article on this topic.

There's actually a Wiki article on this topic.

Thanks Matt !.

SB