CatEye 110 to 1000 lm Bicycle Headlights
About CatEye - "CatEye is the leading manufacturer of cycle computers, lights and reflectors to cyclists in the world. Founded in 1954 in Osaka, Japan, CatEye has always been a leader in innovation and technology."
A lumen is a measure of the total "amount" of visible light emitted by a source. The higher the lumen rating, the brighter the light.