Duo 14 LED Module  Ref: E60970-FIXO
Performance: Because the 14 LED module is regulated and has variable output the spec sheets for these are complex and to be honest difficult to convert into reality. So, to sum it up....

The 14LED Module: This can be switched at any time between any of its three output levels, providing a good flood with a central diffused beam.

Low: <15m beam A comfortable amount of light to cave on and lasts for ages.
Middle: <25m beam For general caving this is the setting you'd use most, providing a good amount of light but still giving good duration. You'll see pretty much all there is to see on this setting.
High: <34m beam Loads of light! good for illuminating large chambers, passages and pitches.

Duration: If you're using good quality alkaline, or high capacity (2500mAh) NiMh AA cells, and cave most of the time on the middle setting, sometimes on high, and keep it on low in crawls, sitting about or waiting, you'll easily do 10 hours without having to change the batteries. With care, using the low setting more of the time, more than 24 hours can be achieved.