Before I explain, obviously the answer is both, but I can't make both a priority at the current moment.

The 4x2x2 I have for my Merauke Blue Tongue only has 1 socket for a bulb. I've been using a ceramic heat emitter in this socket and I've duct taped a tube light fixture on the other side of the tank so he'd have UVB light. Recently the UVB bulb burned out and I'm having to order a replacement off of Amazon which won't arrive for a few days. I have a regular UVB bulb that gives off a little bit of heat that I can use instead, but I'd have to take out his CHE. With this alone his cool side stays at 72, but his hot side doesn't get above 80. Would it be better to keep the CHE in so he's warm (but in the dark) for a few days, or should I put the UVB in so he's still getting light?

Edit: Thanks so much, gonna keep the CHE in this week for him