Yes research research research.. At the risk of coming across as some sort of sales guy, those lights are all old tech and not very efficient, fluence been the best of them and mars been the worst. Just take a look at what all the LED guys are using these days, theres a reason its none of those lights. Try to avoid amazon if possible, reviews don't count for much and 90% of the lights all use the same old diodes and come from the same factories. Also be wary of youtube, since most folk on there make a living from giving positive review videos. Although there are plenty of legit growers on there, defo check out growmau5 and his early HPS vs COB grow comparison and have a look for greengenes on there too. Anyhow, good luck with what ever you decide.