Blackstar 600

Can anyone (other than factory Rep) tell me if they have been successfull using the Blackstar 600 to grow from seedling to flower?
I've had a problems with bleaching and stunted growth, the same plants when brought into the sun recover but I can't seem to get the indoor plants to improve by adjusting the light distance. What's even more confusing is that one seedling (I think an indica) seems to be doing fine regardless of the light distance while all other struggle?

how far away is the light? with a higher power system is puts out a greater amount of light that is more focused than say 2 300w systems since the leds are alot closer to eachother. i do not have a blackstar. i have a pro-grow

Thanks DS, I started about a ft. away and within 3 days the green started bleaching out of the leaves. Like most of the threads say, I thought it was a nute problem, but I removed some of the plants from under the light and put them into the sun without changing any nute or water conditions. The sunlight plants started filling out and started to spread out and grow. I raised the light to about 30 inches but everything under it is just struggling. The plants seem to send out new leaves that only develop to about 2 inches long and the a new set of leaves start to develop and it's like everything else stops growing. 14 out of 15 plants show extreme stress while one misfit is growing great. Well great may be an overstatement but it's dark green as seems to be filling out.