When looking at light spectrum charts, it helps to have a photosynthetic response chart for comparison:
http://www.sunmastergrowlamps.com/Im...esponse_01.jpg
Here's the graph for the light I use, EYE Hortilux BLUE:
http://www.eyehortilux.com/images/mt...ORhtl-sd-r.gif
btw HIDs don't put out THAT much heat. My 400 watt barely raises the ambient temperature in an 800 square foot room 2 degrees Fahrenheit.