FYI MVBs are supposed to have sufficient UVB output for 12 months (Dan is correct), not 6 months like a UVB tube light. I buy T-Rex because of the higher UVB output over the Powersun. The MegaRay is supposedly the same bulb as the T-Rex but I switched after mine burnt out early to see if I have better luck with the T-Rex (and it was cheaper by about $10 at the time). Yes, bulbs are very touchy and lots of things can go wrong with them either in manufacturing, shipping, handling/installation, or use. It would be amazing to never have a problem with one. To me, having the extra bulb sitting on the shelf is worth the peace of mind over having the warranty on it. I also like the idea of keeping the "old" bulb (12 months use) for use if the new one burns out as it would be ok to use until you can order a replacement. Then you don't have the warranty issue. Also, I wouldn't be surprised if a good company would still honor a warranty even if it had passed if you let them know how long you had used it (no personal experience with this in this product line though, only other types of warranties, guarantees, and return policies). There are good companies out there still. I have never seen such a good deal as to buy more than 1. The prices I see online are about the same. I know they have some slightly better deals at shows sometimes though.