Veg under LED is where LED really shines, IMHO. This is where the claims of "90w LED = 400w HPS" are actually true. I have done much vegging under LED, and the results are just incredible.

For example - here are some pepper shots, day 1, 5, 9, 13, under 90w LED

There's a tomato on the other side, the next post will have shots of that in veg.