A sidebar reference off that page points at a good deal on the BD Zenix IQ, a much better headlamp, IMO. LEDs for both high and low beams and a boost regulator circuit that keeps the lamp at full intensity as the batteries go down. (Also gives full intensity from NiMH batts.) http://www.backcountryoutlet.com/outlet/BLD0721/Black-Diamond-Zenix-IQ-Headlamp.html
Also no connection with either company. I just have and like the headlamp.