You could bring it down a foot as is, just have a fan blowing over the plant, with an aircooled hood you could bring it down to 14-18 inches from the top.\
heck yeah man.. whats up with that light being so far away??? and only one plant??? man if i had that space i would have 15 large fems crankin me out a large amount of herb. lower the light to about 1-1.5 feet away from your plant and get some more plants in there and a larger fan. you can grow some large ladies with that space. for the smell get a carbon scrubber. i wish i had that much space. peace.