The Boltzen 55W High Output 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 barndoors 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 High Output Watt video light has 10% more output than our previous 55 Watt light and now has 2 battery slots for Sony style NPF batteries. There is a built in cooling fan to dissipate heat and is barely audible at a distance of 1 meter. The Came-TV Boltzen 55W High Output Fresnel Video Light can be powered from AC (with included power adapter), NP Series batteries or V-Mount battery via the included V-Mount adapter cable providing convenient use on set and on location.Frequency is a strobe setting and the new light has several different effects built in. When choosing frequency it is how fast/slow the strobing effect cycles. Came-TV engaged an independent lab to conduct standardized photobiological testing on the Boltzen series lights to which they passed.<b> Boltzen LED Commander </b>The Boltzen LED Commander is a remote that can control the following BOLTZEN LED lights: Q Series, Perseus, Andromeda, Cassiopeia. Compatible with RGBDT, BI-COLOR and DAYLIGHT versions. Can control lights up to 20 meters (6,500 ft) away. Requires 3 Pcs AAA batteries (Not Included).