You should def. do 1 per bucket. this is my bucket system, 5 ladies 1 per bucket, 2 air pumps(1 for stones 1 for recirculation), 1 bucket controller, and 1 13g garbage can for a rez. Works pretty good.
I know it says they use these in physiological research and biotechnology industries. im thinking of starting up, and was wondering if someone had experience with these bulbs?