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Just got this, will use on a helmet as its a little large for just head use with largish front and rear battery compartment (2 x 18650) The main beam has good even spread when unfocussed, irritating but unavoidable circuit image when focussed. Sidelights are two dots for tight illumination. Sensor mode means no more button fiddling once you press and hold for 3 sec but it's all 3 LEDs on or off Batteries worked straight from the box, useful car and wall charger. Image is in a dark room with curtains drawn all three beams on at 11 am.