GrowFAQ:

Can I use foil to reflect light?

  Added by: MedMan  Last edited by: 10k  Viewed: 779 times  Rated by 14 users: 8.33/10
Yes, but you must use the dull side to reflect your light as the shinny side will produce concentrated hotspots. Using aluminum foil is a cheap alternative to using mylar or white paint, but it does not perform nearly as well.
  Last modified: 21:11 - Oct 21, 2001 

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faq:1117 "Can I use foil to reflect light?"