I'm sure it works mate, I read in high times that THC is canna's sunscreen:
http://hightimes.com/grow/grow-hack-does-uv-light-increase-cannabis-potency/
...note if u growing for cbd this ain't gonna help and may in fact impede what you're after.
I've done it on all my grows, and I find that stuff gets me higher than any commercial stuff from mates...though I could be bias, could be better genetics, grown better etc etc, no way to know for sure apart from getting it tested.
It's only 24w, and only gets run 4hrs per day.