if it's only 1 bulb and you have some 400$ plants thats like .5 wpg you probally need like 2-3wpg and if you want them to be more lush and green EVEN more and need a co2 system to prevent algae and i dont recommend leaving lights on for more then 12 hours without co2trojan09;3556338; said:i have regular compact lighting. 55 watts.