As Seen On TV provides us with the Dremel mototool or irs equivalents. Cut the b****r apart on the glued or ultrasonically welded joints for easy reassembly. To me a watt per mile per hour - minimum - is a rule of thumb I just invented. There is a kids cartoon show where the lead character holds his sword to the sky as lightning bolts spray thru the air and yells, "I have the Power!" It is the way I feel about bike lights.