I added a 13W UVB bulb. A very nice even flat canopy has developed however im still having a slight leaving browning problem pooping up ever so slightly only present on maybe 5 percent of the older fan leaves.
Looking good mate, she's thickened up heaps!
As for the browning, looks like it may have been nute burn, the new shoots look green though so i wouldnt worry too much unless it gets worse.