With regard to heat I feel like I gotta make a semi snarky observation.
Yes LEDs get hot, but they do so significantly less so than halogens.
Set aside efficiency and the fact that the tungsten filament is literally so hot that it glows with black body radiation vs semi conductors that usually burn out at under 140C and just look at power consumption.
Standard halogen is 21w vs equivalent LED at 3w.
No matter how you slice it that means a lot less power in the form of heat being put into the housing.
That's just kinda physics 101. You don't get energy you never put into the system.
Not to say that you couldn't have crappy LEDs that have bad hotspots, but overall the heat load on the light will have to be significantly less.
Just saying
