In a word: awesome.
I’ve now tested the new 26° Betty II (two of them actually), and the light output is fantastic for mountain biking on trails and fire roads (and road cycling too).
The September 2011 Lupine Betty II now offers up to 2600 lumens, with several different LED boards and custom-designed lens systems for various coverage options (angle):
- 26° / 2600 Lumen.
- 22° / 2300 Lumen.
- 16° / 2050 Lumen.
Note that these lumen ratings are measured in an integrating sphere and are NOT the fraudulent theoretical ratings you’ll find with most other brands.