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 ridesquotuses 4 of the latest cree led39s to produce 2000 lumens 1500 measuredtwo power sequences each with three light levels allows users to maximise power or burntimekit comes with a 2 cell or 4 cell es battery energy status batteryilluminated power switch so you can see which power setting you are usingpower output is 2000 lumens measured 1500 lumens6 d