yes thats tin foil lol.... i know its bad but i ordered some mylar today along with a 400 watt hps... i scrapped the all fluoro grow, hps just seems much better. as for soil i am using fox farm ocean forest . the soil has a ph of around 6.8 the water im using has a ph of around 6.6-6.7, im gonna have a problem with cooling my closet when i get my hps because i am not able to put holes in my walls to vent it so i think im just going to be leaving the door open so the heat doesnt build up. is there a better way to cool that light? how much would it raise the temp in my closet if i kept the door closed? heres the link to the light i bout . let me know if its any good. i got it with the hortilux bulb

http://www.insidesun.com/index.php/action/item/id/739/