Since my infrared bulb blew up, I went out and bought a ceramic heat emitter. I have a 20 gallon tank and it is a 60 watt CHE. I read at the store that my original dome fixture wasn't designed for a CHE so I bought the only one that said it was suited for a CHE which was a wire cage fixture.

I feel like it will let too much heat outward and not into the cage. When I put the wire fixture directly on the cage the CHE lays a good 3-4 inches above the mesh. I can hang what I believe is an aluminum dome ( which does have a ceramic fixture) as close to the mesh as I want, with the CHE hanging just inside the bottom of the dome.

which fixture should I use and why? Any dangers to using the enclosed dome? I do have a dimmer switch I can hook up to the CHE but it's only a 60 watt.