Coast 4xaa varied light output 344 lumens pure beam focus head torch description our most powerful headlamp the hl8 has a blazing light output of up to 344 lumens and a runtime of up to 19 hours 15 minutes using 4 aa batteries the low beam gives you 66 lumens and a runtime of up to 79 hours 15 minutes making the hl8 a fantastic choice for heavy professional and industrial users or outdoor use where batteries may be scarce our pure beam focusing optic produces our largest flood beam giving