I am designing and spec'ing a very large commercial job and am wanting to use fixtures that utilize PAR20 39W MH HID lamps as well as T6 39W MH HID lamps. The life rating on these is typically 10,000 hours. I just got a note from another lighting designer that there is some concern that the lower wattage (under 100w) Metal Halide lamps do not last to rated lifetime. Does anyone have any experience with this? Or if you have heard similar or conflicting reports, please share. Thanks.