weed wants to grow a little dirt a little water a little trial a little error your worry of fire might point you towrd floros because they run cooler the hps is the way to go point a fan directly at the light to help keep the temp down i am currently growing with floros and it works but it is verry sloooooooooww growin with minimal yeald and its time consumeing allways movein lights up

i hope this helps... good luck