The Lumedyne HRF1 Ring Flash works on almost all Lumedyne Power Packs. It has 12 LED modeling lights that have a 20' range, for focusing and previewing in the viewfinder prior to exposure.
This ring flash is extemely efficient. In tests, a lens aperture of f/8 was used successully, @ 200 ISO, @ only 12 watt/seconds, from a distance of 4 - 5 feet.
This ring flash features Lumedyne electronics and flashtube in a Hensel designed reflector and assembly.
Sturdy universal camera mount, lightweight plastic body
Coiled pack to head cord extends from 3 - 7 feet.
The LED modeling lights put out a little less than 25 watts tungsten equivalent, but use less than half of the battery energy as a 25 watt modeling light.