Hydrofarm Quantum QT600 Dimmable 600W Digital Ballast, 600 W

Missing the 120 power cord when I opened it up

Excellent product, arrived on time.

I bought 4 of these ballasts a little over a year ago and am happy for the most part with the product itself except the cooling fans on 2 of them are quite noisy. My biggest problem with them is the warranty, I had one go out on the 29th of December and my one year for returning them to the seller was up on the 28th....how ironic so I tried contacting Quantum but they have been bought out by HYDROFARM the only way to contact thier customer service dept is by email. I sent the first email out Dec 29th took a few days to get back to me and a few more days for them to review the proof of purchase then approved it and sent me a return authorization and return label fed ex picked it up 3 days ago so i sent another email asking for the status and this is the reply "we are currently looking into this for you, we will attempt to resolve any issues as soon as possible." so Im not sure when I will get my unit back I do know I will not buy HYDROFARM products again

I’ve had 9 of these in the last 1 1/2 years. Only 1 still fires HPS bulb. 3 still work on MH bulbs. The rest were sent back, 2 didn’t work at all, the rest quit firing HPS bulbs within 3-5 weeks. I love the features and if they all were like the 1 good one I’d give 5 stars but...

I absolutely love this ballast, its the best one I have ever owned. The dimmable capability is essential for lowering temps in the tent and dialing in on the right settings for your environment. It has high quality construction, has a fan that keeps it cool, and its smaller than any ballast I have seen before. It is a bit loud, but my exhaust fans are much louder than the ballast, so I dont notice any extra noise. All in all, I recommend this ballast. IMO it tops the Lumateks, as Ive heard about some compatibility issues with the Hortilux bulbs (although Hortilux makes "e-ballast friendly" bulbs now too). This Quantum ballast boots every bulb I throw at it with no issues whatsoever.