Been running these for 18 months now. Just bought two of the blackstar 900's. Keep you posted.
bought the 500's from lighthousehydro.com in NY, bought the 900 from bcledgrow.ca here in canada. a little more cash but close to home. longer warranty???
Just joined this thread. I'm using the same Blackstar 500's. two tents 4x4x6.5. 1 dirt, 1 hydro. Both GC strain. Keeping the light at 12"-14" during flower Ph is 6.5 on soil and 5.8 on hydro. Let it grow, let it grow, let it grow...