Mirror
a Miror is very reflective but it will also duplacate hot spots as it does not difuse the light at all.. what seams to work good for MH bulbs is a shiny white reflector (ie gloss white paint in your hood, or white sheet metal) or if you can find it hammertone aluminum. if you are talking floressents it would be good as floressent light is already difused so why difuse it anymore.
some people feel that a miror will take away light (because it is going through glass first) but the amount of light that it filters is not realy measurable by our standards but the problem I do find with a miror is that high heat will cause most to delamanate and you will get dark non reflective spots so use on a MH would be short lived because of the heat.
Steve
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