DFI,
Battery in the 15 mcp Thor is the same, 7 amps, I was hoping it was larger too.
lots and java,
I thought surface brightness determines throw, so it wouldn't make a difference, a grape sized 200 watt HID may be the same as a tiny spot of a 35 watt HID when it comes to throw.
3rd shift,
At 75 or 150 watts, I'd worry about heat from the ballast and the bulb next to it all mixing together in a closed space. As Shrek says, "better outside than in".