what FG said
get the HPS and built a new box asap. You re risking a fire hazard with that paper box.
Get the 150W about 12" away from the seedlings for starters or 7" as long as u got good ventilation in there. They r stretching already.
If u r serious about growing some good bud, built the box.
Micromark clip-on fans are great. Get one if u can.
Also get aluminium ducting and a 4" extraction fan.
dont worry about the yellowing on the leafs for the time been.
Water by weight of the pot.
paint the walls white
i ll stop here, cause i m repeating FG's post
