The Heser Second Edition has a luminous flux of at least 300 lm. The LED head is pressure resistant up to 20 bar.

Powerful 4W LED A well-focused beam of light 27mm outlet diameter High reliability Shock resistant Fully sealed LED unit (continues to function even when the case is flooded) Good LED cooling due to the nickel-plated aluminum battery tube. Without electronic control 2 O-ring seals Baby C batteries (3, not included. Depending on battery quality, it may provide 6 hours or more of autonomy)