It will stay polished for a while. When it oxidizes, polish again. Should be much easier to repolish once you get the first polish done. Or you could try to find a highly reflective white paint. At work, we switched over most of the specular (special reflective coating) aluminum reflectors to the white paint. It reflects ~95% and is cheaper.
Just by coincidence I had to light up a 400W metal halide lamp today to see how it performed in a light fixture. Even through a white acrylic cylinder the lamp was almost too bright to look at. I thought of you guys.
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joesgarage, watercooling a HID bulb takes away about 40% light intensity. Also, you dont want to use a HPS light for this application. Stick with MH.
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True, the color would be bad and the price is outrageous. Close to US$1000 for the whole setup! HPS for growing, MH for projecting.