Does anyone know where to get a "Deep 12-24 inch parabolic aluminum or steel mirrored reflector" ? Many of the science or lighting labs I find, don't seem to have "deep" dishes, only shallow ones with a small hole in the bottom. I need a bigger hole such as 3 inches or more. Glass is okay, such as from an old traffic light reflector.
jnwells

I really don't know.

Have you tried ebay?
Or maybe there's a forum somewhere for collectors of old traffic lights?

What's it for?

I ground a parabolic mirror out of porthole glass once, but that's not going to help you...

These guys Oriel Sales (http://www.newport.com/oriel/) use them in their solar simulators. It's a deep parobolic reflector, metalized aluminum, I believe, but they might cost you about a grand.

Manufacturer of Electroformed Metal Reflectors & Optical Collectors, Electroforms In Both Copper & Nickel - Phoenix Electroformed Products, Southern California (http://www.phoenixelectroforms.com)

i have a 24 inch glass mirror with a short focal length about 18 inches. it weighs about 80 lbs. i could let it go.

more info 24 inch mirror. it came with a corrector plate, half inch glass. the mirror has about a 3 inch hole in the center, i think it was made for some sort of projector.