Heat Lamp Question

I have been to Home Depot, Lowes, Etc. I have been looking at light sockets to screw a inferred bulb into. The only one I can find that has a ceramic socket has a (for a lack of a better description) 10 inch shade.

Is this the size others are using? There are smaller ones but they don’t have the ceramic socket.It seems like a lot of misdirected heat with the larger shade.

Any help would be appreciated.

Start Jan 1,2009 5.75" BPEL and 5.55" EG

Longterm goal 8" BPEL and 6" EG