dome

The 8 1/2 inch ones would probably be better. The spread the heat out better and they don't tip over as easy as the smaller ones.
 
The 8.5 inch ones also expel a lot of brightness, which is beneficial for most chams. Definitely go with an 8.5 but since it does seem to disperse the heat more efficiently, you might wanna use a lower wattage bulb than usual. 100w for me was way too much, I use 60-75w for my 8.5" domes.
 
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