Anyone see the episode of mythbusters where they tested infared? They put a 1/2 thick piece of glass infront of the heat source, and it completely hides the heat from the infarered device, like ones helicopters and nosey nieghbors have. Makes me think glass outside and a reflector inside would be the ultimate box!
i saw that episode and was surprised that it was so easy to trick, definately a good bit of knowledge for growers.