The mesh do not get that warm actually. I'm guessing the mesh-attribute does not allow much of the heat to actually be absorbed by it. When using it on a 12 inches tall terrarium, you probably want to dimm it, but since the lamp already have a built-in dimmer, that's not a problem
(Just two little side questions:
1. What's considered a "standard 10 gallon" in the USA?
2. What kind of animal are going to be heated by the lamp?

)