if your going to use cfls 2 inches is way to far.. if you look into cfls you will find after a inch the lumins go way downn by over 50%. on top of that you should only have the sides of the cfl facing the canopy... socket side face up is used to give light to the side or bottom....the side or the coil section is where the most light is produced...personally 42 watters are too hott in a small or micro grow... 26 watters are alot cheaper and more can be used... now if u have the same wattage you will actually end up getting a better yield with smaller bulbs because smaller the wattage of cfls the more lumins per watt are produced........also the lower wattage are cooler and can be place almost ontop of the leaves without a burn at all.... cfl=== Cover the Fucker in LightI BUILT THIS LIGHT IT IS CHEAP TO BUILD AND IN THAT SPACE IT WON'T BE TO HOT AND WILL GIVE YOUR GIRLS 16800 LUMENS 6-42W 6500K FOR VEG AND 2700K FOR FLOWERING.. HERE IS A PIC OF MINE, IM USING A TOTE LINED WITH FOIL FOR A REFLECTOR RIGHT NOW UNTIL I CAN AFORD TO BUILD A BETTER ONE....I HAVE 4 26W 6500K AND 2-42W 6500K BECAUSE THIS IS JUST A TOTE AND THE TEMP STAYS AT 82. BUY A CHEAP CLIP FAN AND BLOW IT ACROSS THE BOTTOM OF THE LIGHT IF THEY BECOME TO HOT. I CAN KEEP MY LIGHT 2" AWAY FROM MY PLANTS... GOOD LUCK WITH YOUR GROW.. FEEL FREE TO ASK ME QUESTIONS.. BUT I AM STILL A NEW GROWER MYSELF. IF I DONT KNOW THE ANSWER I WILL PROBABLY BE ABLE TO FIND IT.. I HAVE BEEN DOING ALOT ALOT ALOT OF REASERCH..