I posted this somewhere else, but I bought a Bestva 1000 and a Viparspectra 450 Dimmable, which is a total of a little over 400 actual watts, or is supposed to be. When I first plugged them in, the Bestva was clearly a more powerful light, but its light was real red. I thought that might be a plus for flowering, but I wasn't entirely sure. Anyways, after growing for a while with them, the Viparspectra is clearly a superior light as compared to the Bestva. I don't know how to explain it other than to say, "it just seems like cleaner light." The plants underneath it always do better. No way I'd ever buy another Bestva light. I would buy another Viparspectra, though. The thing is you can get a HPS light for what you pay for one. The reason I haven't gone that route--YET--is because it's going to run the electric bill up, and after seeing how much the Bestva heats up my grow space, I'm not even in the position to deal with the heat an HPS fixture is gonna cause.