The first two are cheap knockoffs of the third. Cardboard, you can do that yourself.... Can't tell what the first one is made from but you definitely want to be able to lower and raise your lights. The one with the HPS is going to give you the best yield, plain and simple.... Plus it looks to be made of steel or aluminum, durable, plus you can snap on a carbon filter....

A famous and well respected grower here on cancom says, "if you go cheap, you grow cheap!". Indoor growing is not something that is inexpensive to do especially if you want better than ok results.... $500 is just the beginning....

Good luck to you and your decision....

CGI::::::