Hello, I've been looking around for a reliable grow light. I've looked at the GYO2002 400w on amazon and it seems too good of a deal to be true for that price. For $43 more the 600w from htgsupply seems to be a decent deal. The brand is digital greenhouse-from a few searches on google there doesn't seem to be many complaints about them. Basically, what I'm asking for is if anyone has had any issues with the cheap ballasts or are brands like Lumatek or Nextgen that much better? I dont want to make a poor investment and end up with a broken ballast later 3 months later, but to save some money would be nice. Of course, from what I have read the yield increase for a 600 is a lot better than a 400 and the heat increase isn't monumental (electrical cost does add up though). Is there anything that I should consider? Anyone have any other good websites? I've looked at indoorgrowsource-they seem to have a good deal on a 400w lumatek and dchydro-their website seems disorganized with missing pictures and multiple links to the same item on a page for me to trust them.