I don't think mylar would stand up very well to heat. It is basically plastic with an aluminum film on it. It would deffinitly not be good for metal halides, with flourescents you would have to have lots of clearance and air movement for it to remain cool.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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