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what is the average lifespan of an OEM D2R bulb ?? My 98 Ls400 with 157K miles has the HID's. I dont ever recall changing them.
Philips officially says that the lifespan is around 3000 hrs, the bulb is at 50% brightness. This means, a bulb may still be working long after that but it is getting darker. http://philipsxenonkit.com/tag/hid-l.../#.VkU3_3r7vtQ
I have replaced mine 2 years ago when it was at 150,000km aged 15 years for the first time. I noticed the big difference of the brightness. I'd say almost twice brighter than before and it made me much easier to drive at night.