My first 600 was a virtual sun digital, fuckin things sitting in the garage collecting dust. Gave off a ton of RFI and the damn thing wouldnt keep a hps bulb running at 600, mh bulb at 600 no problem, hps would keep shutting down, tried a different bulb and same thing, dimmed it to 400 and no problem, service dept wouldnt return my calls or emails, posted a review on their site that they obviously didnt publish, fuckers. Had my internet cut off til I got a lumatek and I no longer had this strange interference coming from my house.