Originally Posted by
gecho
Assuming a generous efficiency of 150 lumens per watt, a 1500 lumen headlight needs 10 watts while a dynamo produces 3 watts.
Lumens is a dumb way to rate bicycle lights, but I think I get why they love to use it (bigger numbers.) If a light isn't focused well, it needs to spray out a lot more light to accomplish its job. With the brighter and brighter LEDs available now, there's less incentive to do a good job of that.
100
lux headlights are pretty impressive, though, and can be powered by an ordinary 3 watt hub. If that's not enough for you, you must be riding a lot faster than me at night. Chapeau.
