hi lordsoth,if i were you i'd take the 150w down an let the 400w get on with it.save the 150 as a back up lamp,as if it get's as hot as you say i'ts a fire hazard!!!!aslo i think lamp's are a bit close together...don't want one of them poppin another fire hazard..the 400w i had did the job nice!only i moved house 2 year's ago, an got a bigger growroom now,so i been saving an got me a 600w..sweet.hope this help's...love an respect..spliffbuilder.