I know when I go outside at night I can see that it is not totaly dark.
unmeg Reviewed by unmeg on . White Black White? Was wondering if anyone can help? I went to buy some Mylar the other day and was told that if my growroom isn't totally free from outside light then Mylar is pointless. The guy said that you need to put white black white on 1st to make sure all gaps from external light are covered and then put Mylar on. Any advice much appreciated Rating: 5