If your running 1000watts of led it should be much higher than 10 inches. I keep my 600w full spectrum sun at 15inches. And it was yellowing leaves(light burn) at 12 inches. You want some stretch in her so go a little high until you see her stretching then when she's where you want her height wise bring your lights back down a little at a time and see how she responds. Led is different than other light as it's intensity goes by PAR(or PUR to be more accurate) check your lights manufacturer recommendations. They more than likely have an expensive par meter and have listed the best height for most intensity