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Bought the 270W (~180W actual) to partner with a more expensive LED in a 4x2 tent. This light held down its half of the tent very nicely and the end results were very good. This is a solid mid-grade light that got the job done over a 2 x 2 area. Could probably cover 3x2 but I didn't need it to. Runs pretty cool. Fans are a little loud, but easily swapped if you can do basic wiring.
I've had two of these now and they've both died on me. The first one wasn't giving me reliable results so I contacted Hanna to ensure that I was doing everything correctly and they said I was so they sent a replacement. The replacement completely stopped working within a couple weeks. I went back to using the unreliable reader because I didn't feel like asking for another replacement and that one also eventually died on me. Bottom line: If you get one that works, it won't work for very long.