I bought a GL60 tent, which measures 24"x24"x53". I plan on separating it into a small veg chamber on bottom and larger flowering chamber on top. Obviously, being a small space, heat is a concern -- in my current tiny homemade cab my 150W HPS will raise temps to 105 in a couple of minutes without my fan on. CMH bulbs are appealing to me because my understanding is that they emit less heat. Can anybody attest to how much less? How does, say, a 150W HPS compare to a 250W CMH?