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Message: [QUOTE="Oliver Buckle, post: 239176, member: 12649"] I don't know. I don't grow under lights myself, but I have a couple of friends who do and they both swear by it, and I have seen it recommended elsewhere. Just looked on the web; they say the difference in light reflectivity is minimal, but foil also reflects dark objects, creases easily, tears easily and tarnishes. They are also talking about 'white' paint and paper. I think brilliant white is a bit more reflective, but it can't be much as they are talking 85-90% reflectivity. Foil may tarnish, but paint will discolour, however a fresh coat of paint is simpler than replacing foil. Some people seem to think the diffusion and heat transference effects are important too. [/QUOTE]