From Amazon:
High-intensity cycling headlight for urban and trail use that’s visible in daylight from more than 1 mile (1.6 km) away
Projects a steady blast of 800 lumens for up to 1.5 hours
Automatically adjusts to ambient light conditions, speed and ride profile to extend battery life
Shine bright with 5 light modes no matter the conditions
So smart, it can adjust to ambient light and speed to save battery life
Note this deal is from Amazon US. Amazon AU is $187. Sorry if there's any confusion with the title.
C3 shows lowest was $139.
Mod Update 15/03: Price has increased to $152.86
Do I read correctly that this needs an extra "garmin edge cycling computer" to actually enable the smart features?