Hhahahah wow sounds like you had the same type of setup. We did the exact same thing.
and then we took a shoe box to put the pot in and lined it with tin foil, we also put tin foil behind and above the light to direct the heat and light more downward to the plants.

haha we also used a kite string ring, it was just big enough to slip over the bottom half and stop before it went all the way off the light socket/holder/lamp or whatever haha. :rasta: