If you want to line a hood I suggest you find some of the silvered
mylar
materials that feature reflectivity well over 95%. 3M Silverlux was
once
discontinued, but I still see variations on it for sale around the
web.
The hydroponics.com franchises sell two kinds of reflective mylar. The
regular one doesn't stand up too well but the ehat and water resistant
one
will work and also has a claimed 95% reflectivity.
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