Our most powerful head torch 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 you the ability to shed light on a very large area and the bulls eye spot beam can il