Quote:
Originally Posted by dmforcier
The aluminum foil makes an obvious difference to the light level at the plant. Presumably the towel contributes too.
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I respect your opinion. The towel gets my vote over the foil, though. Flat white has a diffusing affect on the light it reflects, allowing more to hit the plants.
The best reflector is a mirror....but not one you buy at Wal-Mart, it would be more like the mirrors they used on the Hubble Space Telescope, which are polished to microscopic perfection. Under a microscope, the Wal-Mart mirror isn't flat at all, but our human eyes can't see that. Every imperfection will reflect light unevenly, which is what happens with foil and mylar.
I think most gardening trays and pots are black with the thinking that they will be in a greenhouse trying to gain heat from the sun in the winter or early spring. In that case, black plastic works great. But for indoor gardening, I think white plastic makes a lot more sense, for the sake of reflection alone.