Running a 12 volt LED driver at 24 volts

[tree707]

What are the dangers? Heat, equipment failure?

[bcroe]

What are the dangers? Heat, equipment failure?

You didn't specify what kind of driver. If you are over its voltage limit, expect a failure. If its not a switching type, it will likely get
much hotter. Bruce Roe

[Mike90250]

I would expect equipment failure, and it would not be covered under warranty, as you misused the gear. if not UL listed, you could expect fire too.