I replace my lamps every two years and have never had one burn out, but Venture lamps burn out in 7 months or thereabouts.
My other HID lamps are Sylvania and I have never had one burn out.
Avoid Venture lamps....the price is reasonable, the lamps are not.......
I have tested a lot with light. I find 6500 Kelvin is the best !!!
All @ my Tests :
http://www.chili-balkon.de/forum/viewtopic.php?t=298&postdays=0&postorder=asc&start=165
http://www.chili-balkon.de/forum/viewtopic.php?t=298&postdays=0&postorder=asc&start=195
http://www.chili-balkon.de/forum/viewtopic.php?t=298&postdays=0&postorder=asc&start=225
Greez Jogi