The Octalight uses an inner silver coating as well as double diffusers to produce a very even light, with very small differences between the center and the corners of the box. By removing both diffusers the Octalight turns into a large reflector, creating sparkling highlights and smooth shadows.This softbox will fit all Profoto lamp heads as well as virtually any other manufacturer’s lamp heads (speedring required for use with non-Profoto heads).