WE were very happy with our ceramic metal halide grow lights - it made such a difference!
Last year I had got a full spectrum 1000 watt LED but it was not the white LED and I was not happy with it at all even though it did the job for growing decent veggies, you couldn't tell what was happening with the leaves and such because of the weird pink glow it put on every thing! (did make for some beautiful picture with the pink glow on the snow outside though!)
With the white light you should be fine. and it will definitely cover that area. I haven't had any experience growing cannabis under LED before the CMH we had a high pressure sodium light which produced fine but not as good as the CMH!