Last night I hooked up 2 commercial 2ft 2 light fixtures and put 4 of 20 watt standard glo lux bulbs in over my 26 gal bow front. I havent seen any drastic changes yet but the light was only on for maybe a hour.They really make the colors of the plants and the fish come out. I am curious to see what happens after a full 12 hours of use. Sam i notice on the packaging the bulb came in that it said the standard bulb was mainly for seeds and seedlings. Does that mean its got a higher output? What do you think that means?