The Boltzen 55w Video Light includes an adjustable Fresnel lens to help focus the light and provide a longer throw. When used without the lens, the light becomes a wider flood and the included barn doors help to control the spill. This versatility allows you to go from a tight spot to a wide flood all in one continuous light. The Boltzen 55 Watt video light shares the exact same housing as our Boltzen 30w Fresnel with the exception of a built in cooling fan to dissipate the extra heat. Our fan is barely audible at a distance of 1 meter. The CAME-TV Boltzen 55w Fresnel Video Light light can be powered from AC (with included power adapter), NP Series battery or V-Mount battery via the included V-Mount adapter cable providing convenient use on set and on location. CAME-TV engaged an independent lab to conduct standardized photobiological testing on the Boltzen series lights to which they passed.