The YN900 is a professional portable studio light with LED technology. It consists of 450 LEDs with a temperature of 3200K and 450 LEDs with a temperature of 5500K, featuring top CRI 95+ ratings ensuring superior color accuracy. By adjusting the intensity of the warm and cool LEDs, you can achieve intermediate light temperatures. The YN900K has a digital display to control the lighting power. It can operate with power (the power adapter is NOT included in the package) or with Sony L series batteries (not included).