how high should a 250w hps be from the little ones

hey i got three Auto-AK47 babies two days old in a 2x2x4 with a 250w hps my light is 20in above the plants is it two high yes/no the temps 78-80

thats a bit hot.

i grow with the same wattage i keep my light 12 inches above. my plants grow really well with it. u should do the same just make sure it doesnt go pass 80 degrees in your room. but your fine with that.