How Reflective is Polystyrene Foam

I have a few thick sheets that i plan on putting under my grow trays for insulation , I was wondering if anyone knows how reflective it is for light ?... Could it be used to to reflect light back up from the lower part of the plants ?

well yes it does reflect some, but it isnt a very effecient reflector.

some spray glue and mylar could fix that though

NOWitall said:

well yes it does reflect some, but it isnt a very effecient reflector.

some spray glue and mylar could fix that though

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Thanks

Yeah ... not a bad idea , Might give that a shot