This very robust obstacle Led light is easy to install and need no maintenance. The waterproofness is elaborated to guarantee that no water or humidity came into the light. A special physical barrier guarantee that no humidity can come from the connection (WatBar). The OBS MKII use 8 power LED from specially selected for their quality, lifespan (< 80’000 hours), and photometrical stability. Color of the glass dome is accorded to the LED direct color, it guarantees no chromatic or photometrical aberration.