How can I control and change the illumination spot of my ML4 LED HeadLight?

The HEINE ML4 LED HeadLight has an adjustable illumination spot size with a spot size range of 30 mm to 80 mm (at a working distance of 420 mm). The spot size can be controlled via the aperture lever on the headlight.

Which Binocular Loupes can be mounted on the HEINE ML4 LED HeadLight?

All HEINE HR- and HRP-Binocular Loupes can be mounted on the ML4 LED HeadLight.