Heat transfer of glass

I'm looking for some form of glass, or glass with a coating that is highly effective at passing heat energy from a lightbulb, even to the point of absorbing the energy from the lamp side and radiating it to the room side. I want something that will reflect a very minimal amount - zero if possible.

this glass will need to stand up to fairly high heat conditions. I can work with sheet stock as long as it can be cut, drilled, etc. by the normal methods. If the sheet has a fine texture all the better. I would also consider something that may need to be custom molded.

Application is recessed lighting fixture lenses.

Thanks for any help you can give.