Are you sure it's the lamp, and not the inverter? It could be an inverter problem that's taking out the lamp.
Thanks for your reply, and no, I'm not sure it's the lamp. I'm no computer whiz but I'm very good with electronics and there's almost no way I burned through a second lamp inside 3 mos. when the first lasted 4 years. I'll look into the inverter right away, thanks much.