Red and Blue light(400 nm and 640 nm) are the most efficient wavelength for Photosynthesis so it could help. Many growlights consist only of red and blue LEDs however they turn everything a weird pink color so most people don't find them appealing visually but plants will grow fine under them. I have a terrarium that is about 12 inches tall and a 9 W Jungle Dawn LED (also 6500K I think) and its just barely enough for things on the bottom but fine for everything else so you could go a bit brighter as yours is bigger. As for the fan, I think more than once or twice a day is good. I run my fan on a cycle of a half hour on, followed an hour off and repeat. Keep in mind the idea is to circulate the internal air, not bring in outside air that would lower the humidity and that you just want to prevent any stagnant areas, not have a tornado.
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