Is this too much light?

@Rogue
Well, I grew 3 different strains in soil (ocean forest) and used foxfarm nutes, just 3 plants from clone.

The overall yield I thought was nice and it may have been the strains, one got a lot more chunky than the other two. I kind of feel like I could of gotten better penetration from the lights.

I did keep them pretty close to the lights, probably 12 inches or so. I definitely want to increase the lights, just worried this is a large a leap.