I just purchased 4 more of these for a total of 12. I am realy happy with these, there 105 watts that put out 420 watts at 6600 lumes, 5000k,and rated at 10,000 hours. I removed my 2 600 watt soadiums and replaced them with 3 of these and droped my electric bill from 400.00 a month down to 168.00 a month and see no drifference in growth. The plants are doing great. I just thought you all might like to know. GREAT GROWS. TOAST PS. you can get them buylighting.com