Output: The white light produced by the LED appears ever so slightly purplish relative to direct sunlight, but you'll never notice it in actual use. In a dark room it appears pure white.
By my estimates it is producing
about 139 lumens on the High setting, which means
it outclasses both the P60 and the brighter P61 incandescent modules used in many Surefire 2x123A lights in terms of lumens output. It also beats them in runtime. It runs for about 1.5 hours regulated with two 123A cells while the P60 runs for about an hour with declining output, and the P61 only runs 20 minutes. By the way, the Low setting with 123A cells produces about 13.9 lumens. See
this page about how I calculated these lumen estimates.
With 123A cells, output is regulated until the batteries can no longer supply enough current. It can also use 18650 rechargeable 3.7V Lithium-Ion cells (commonly known as the Pila 600P) to produce diminishing output over time, but longer runtimes....
Are there any rechargeable options from 3.7-6V that can be used in the stock 6P? I was planning on modding one, thinking that a 18650 would fit in there ok. 
. Appreciate the help!
. Does that weaken the tube significantly? This light will likely take a beating. And it's good to hear that you like the WE cree--I don't have it yet. How does it compare to their stock 3.7V D26? Thanks again!
