I got a 6" dia. aluminum half sphere to try testing instead of the dog bowl

. I'd like to check the light output and lamp temperature with no reflector, a white sheet reflector, a spherical reflector, and a parabolic reflector.
The picture from left to right shows the ballast and 150 watt metal halide lamp, a light meter that measures lux and foot-candles, the parabolic reflector, a thermometer, and the spherical reflector. All are sitting on top of the white sheet reflector.
killernoodle - the aluminum half sphere was in bad shape inside. It was spun from aluminum sheet. It had a hole in the center so I put a 2" long 1/4" carriage bolt through the hole from the inside and used two washers and a nut on the other side to make a pin I could put in the chuck of an electric hand drill. While the drill was running, I went from sandpaper to 0000 steel wool to automotive polishing compound on the inside.