pretty good i dont notice any diff really....no shock or anyting like that from the change of light if thats what your asking? I put one of the panels to the left of my hps and havnt got around to puttin the other on the right side yet (dunno if that will even happen since i plan on moving soon) but once i move i plan to use the 2 126w leds from veg to flower on their own and use a 220w t5 for my veg and cuttings Hope to have them on alternating schedules and get my perpetual back in rotation! Also i reconfigured my plant arrangement after the pics earlier and all of them are directly under the 600w now as opposed to before when they were to the left of the 600 and mainly under the led....good vibez bro