Extremely Durable, light output in order

I have these lamps now been built over 2 years in my vehicle. Since relamping is always a work in mühseelige my vehicle, because you have to remove various attachments to get to the spotlight, it should be long-life lamps. From the bulbs with supposedly 50% more light, but I had only about 4 -6-month lifetime because of the effort in exchange enough. This to me is not really understandable, because a lamp exchange is relevant to safety and should be achieved without tool kit with a few simple steps. Do not ever want and you can for relamping a specialist workshop, as recommended in the board manual, endeavor. Anyway, I've bought because of yet confident warranty of three years, Osram Ultra Life and has not been disappointed. The shelf life is already great. The light output is, however not overwhelming, but no worse than the standard bulbs, but probably by design do not change. Nevertheless, I shall keep this lamp currently me for a long time before the nightmare scenario, the lamp failure, night in a rural area. Thank you and therefore also strong buy recommendation.