I would say go for it, especially if it's free. Free is a very good price, but most things aren't really free. 400 watters get hot. You will need ventilation, preferably with real duct piping, not the coiled dryer stuff. You will need about $300 worth of fans. You need to spend MORE on ventilation than on a lamp. I would be cutting holes in the housing of that light to make it a sealed hood where air is pumped over the lamp.