If it's not giving off light than it's basking bulb. Is it ceramic? Or is it red? Either way, it'll work, but I wouldn't worry about dimming it. However, a radiant heat panel will work better because it won't suck up humidity.
Spraying by hand will also work, but you need to keep the humidity HIGH or you'll be plucking eye caps, so I recommend a mistking, depending on your enclosure, to keep it easy. Spray the enclosure, not the snake.
Are you sure it's CBB? Most on the market are wild caught. Wild caught can have parasites and such that can effect eating, so it does make a difference.