I have been running 6 of these for the past 4 weeks over some TH Snow and I am actually blown away by how much crystal is producing and the density of the buds. These are the first LEDs that I can actually say will indeed replace a 1000w HPS. The footprint is a good 4x4 and the most incredible thing is that these lights are almost completely silent despite running 5 cooling fans. I'm impressed, these lights are the real deal! 5 stars!!!