Joined: Jan 2009
Posts: 44,338
Likes: 6,639
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
As someone else pointed out in another thread months ago, a more powerful light can be more useful not because of the higher output but because the battery has greater capacity. Then you can run it at half power and get more run time out of it.