it does look confusing doesn't it? iirc the milliamps come from the output of a small photovoltaic cell Stingmon shines the light on...not reproduceable 'at home' unless you have the same equipment, though it's a good objective means for comparison of light output over time, i guess..poisonally, I prefer to look at comparison photos of the beams, side by side when possible, a picture is worth a thousand words, at least.
(edited) I reread your post and maybe you refer to the milliamps being used by the bulb and circuit if any? while the light is on, a break is found, or made, somewhere in the circuit, and the meter probes are inserted, sometimes this is as easy as removing a tail cap and touching the probes to the battery and the body of the flashlight -- Brock has described a 'paddle' - a thin sliver of material with probe wires attached onto foil glued on opposite sides, plus and minus, so that it may be slid in between a couple of batterys for a in series milliamp reading..hope I've been somewhat clear..?
