The r4 lamp is small enough to use as a head torch yet still gives out 2000 1500 measured lumens for use on the most demanding rides hope r4 led lamp features uses 4 of the latest cree led39s to produce 2000 lumens 1500 measured two power sequences each with three light levels allows users to maximise power or burntime kit comes with a 2 cell es battery energy status battery illuminated power switch so you can see which power setting you are using 6