I heard that around 6500k is best for plants. But i have read numerous articles where people run the typical marine lights like a 18000k and an actinic bulb to grow. So what gives, will the 18k and act. bulbs grow plants also. Which is the best bulbs to run. I have 4 flourescent tubes running 2 nutrigrow bulbs, and two all-glass aquarium bulbs, and thought about running an actnic bulb. But will that hurt plant growth? Just wondering best for plants??