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When on, the power button cycles through the modes from a 5 lumen eco, to a 30 lumen low, a 80 lumen medium and a 260 lumen high
The cuff and shell have an interlocking Y-shaped spine connector, for excellent support and drive and a surprisingly smooth flex that ramps up as you push further forward with your leg
For very high power flashlights or ones with a head diameter later than 100mm, I use one of my homemade integrating spheres, with a calibrated flashlight for calibration purposes
Different battery types have different output characteristics and energy density
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