The 6P is the light that started it all. The first light to use lithium batteries and a high-output xenon bulb. A good idea is a good idea. The updated 6P is still precision-machined from aerospace-grade aluminum. The 6P produces 65 lumens of light for 60 minutes (as bright as a much larger four D-cell flashlight), or 120 lumens for 20 minutes with the optional ultra high output lamp.