Be seen either in the day or at night with the super powerful specialized flux expert tail light the flashing mode automatically boosts the light39s output to 110 lumens during the day for up to 14 hours while making you visible up to a two thirds of a mile or one kilometer in full daylight specialized flux expert tail light features maximum safety even in the brightest conditions 110 lumens output sets new benchmark visible up to 06 mile10 kilometer during