I have bought from AH supply several times and I'm very happy with my purchases. I have bought 4x (separately) 2x55w kits, and 1x (for customer) 4x96w kits. I have had only one set burn out after more than one year. It happened to be a 2x55w kit, and it lasted approximately 18 months which is what I've been told to expect from CF bulbs. The one that failed was a 5300K bulb set (2 5300K CF bulbs), but the 6500K bulbs that were in the same setup are still going for more than 3 years now. They have since then stopped producing the 5300K bulbs and now only produce 5500K bulbs (near that kelvin). I believe their 5300K bulbs (which I never saw being sold anywhere else) may have been slightly more fragile than the 6500K bulbs. I don't know about this or their average bulb life, other than to report my own experience. The customer tank I setup is fairly new (at 4x6500K) and has only been running for 6 weeks.