I had a few hamilton 6.5k MH lights go bad on me and apparently this is happening a lot with the current batch they have. I can either wait 2 weeks to get new 6.5k that work (meaning no light for 2 weeks) or I can get them to send me 10k ones now. Is there a real difference in how plants grow under the different lights or is it just a visual thing? I have read that plants are fine between 6-10k but I just wanted to see if anyone here had any practical experience with the 10k. Thanks.