Finding your information to be inaccurate...like I said before, you can see my temps and see that it's not an oven...I've seen people with wooden boxes run higher temps than me. CFLS do NOT put out more heat than HPS and CFLs actually put out the same amount (maybe even more) of USEFUL light that HPS does. Before you argue with me, check out this post by Roseman...the CFL and Bubbleponics master:
Plants use mostly red and blue light. Yellow and green light is of little use to them, so light that is emitted in these spectrums is wasted energy. Most of the light emitted by HPS lamps is in the yellow spectrum. Only a small amount of the emitted light is is in the orange or red spectrums, which plants use efficiently. Warm white fluorescents (2700 Kelvin) emit a greater portion in the red and orange sectors.
Although fluorescents produce only about 75% of the light per watt that the HPS does, the amount of light usable by the plant is equal or probably higher with the fluorescents. You may wish to experiment to see if adding a single cool white CFL to replace one warm white results in shorter, stouter stems and more vigorous growth. The reasoning is that warm whites don't emit much blue light, which the plants use for photosynthesis and to regulate their growth. The cool white bulb supplies the blue light.
My call for your unit would be to use several (three to five) CFLs with a total input of between 120-160 watts. Although the 150 watt HPS is a bit more efficient that the CFLs in total output, watt for watt the fluorescents provide as much useful light as the HPS lamp. Heat is another consideration. The HPS runs much hotter and emits more heat than the flourescents.
By the way, Roseman pulls 3-4 ounces off one plant. That's not bad for small growers who don't want to invest in the ventilation and electrical costs of running a an expensive lighting system in a small area. Hell, an HPS won't even fit in most micro grows. It's easier to use CFLs.