I know I have 3 different K running in my grow room for my veg. I have 5 23w 6500k, 1 Growtek 6500k light, 2 13w 2700k CFLs. I also have 1 7800k light. But I have this 4 foot fixture with plant and aquarium lights on it. what is the kelvin on that and how beneficial is it to my plant