I personally just went through an overhaul here switching out all my Powersuns for dual fixture fluorescent with halogen spot lights in all my melamine cages. Yes, Powersun bulbs do have warrantees where if the bulb blows before 12 months they will replace it if you ship it back with your receipt. I personally can't remember the last MVB I had bought last over six months, and most blew after 2-3. I personally just had enough with them blowing, and switched back to dual fixtures that hold two Repti-Sun 5.0's. Not sure if my electricity was the problem, surges, or what, but I treated these MVB bulbs like diamonds not touching the bulbs with bare hands, and once putting them in not moving them at all like recommended by Zoomed, and still they blew prematurely. In all these cages I had to use 100 watt Powersuns cause the 160 was too hot, and after seeing the results of some tests on the 100 watt flood bulbs I was not happy. Seemed they died in UVB output big time after the first 2 months. I feel comfortable with the dual fluorescent as even before the Powersun MVB I did fine raising up reptiles without MBD or growth issues. I use to use 1 fluorescent Repti-sun 5.0 and supplemented with rep-cal with d3 before the Powersun came out. The 100 watt MVB only covered the basking spot in my cages, and now with the long tubes and the larger basking area, they will receive UVB throughout most of the cage, and because I use mostly melamine enclosures, and not glass I was able to attach them half way down the back wall and within 8 inches of the basking logs that are more then 2/3rds the length of my cages just like the fixtures. I doubt they will get less UVB exposure especially with the dual bulbs at the close distance. The fluorescents are recommended to be switched out every 6-7 months. The Powersun supposedly last 12 months putting out high UVB, but it seemed with the 100 watt flood bulbs after 2-3 months it equaled the power of a strip light at proper close distances. The 160 gives out more after 2 months, but they start with more as well. Not sure if I was able to use the 160's without the blow outs every 3 months I would have switched, but I'm happy with the dual strips now and my cages are nice, and the brightest they ever been with much whiter light then I had with the Powersun and a cheap fluorescent going. Some places you can go to see some test results are at www.beautifuldragons.com and at the yahoo group copy & paste http://groups.yahoo.com/group/UVB_Meter_Owners
Either way if you can get the 160 watt MVB to last without blowing, and don't have many cages to worry if they blow and take a while to get replacement by Zoomed, or use a dual fluorescent fixture with repti-sun 5.0's and switch them out the reccomended 6-7 months you will be providing nice UVB for your dragons
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