Yes, heat is a concern but shouldn't be a problem in a large, glass light. I had a pair of 100/80s that I used for a decade, moving them from large round lights to small, rectangular quads to large rectangular lights with no problems in any. You'll also hear concerns with current draw and wire size but there were never any problems there either. Designing a dedicated circuit with a relay and large wire is fairly cheap and easy to do and it may actually help. I'll let the electrical engineers debate that one. To me electricity is smoke, let the smoke out of the wire and it will quit working.