Another thing I found with clf's in the past is that the number of bulbs contrubutes to heat more than higher wattage. IE it seems that a 14w cfl gets as hot as a 23w. So it would make more sense that my 5 105 watt bulbs will run cooler than say 23 x 23watt bulbs. I would also think that is why your 7 23 watt bulbs are giving you heat problems as supposed to adding another 2 125w?