Inspire creativity by changing the color of your flash output to Red, Yellow, Green or Blue. The Gary Fong Gel Filter Set for the Lightsphere Collapsible Diffuser is designed to be used with your Lightsphere Collapsible. These filters are used to balance the outgoing flash light with many types of ambient background light. The yellow filter can also be used to lower the Kelvin temperature value of standard 5500-K daylight flash units to match the common range of typical tungsten-balanced household incandescent lamps. The green filter is used to skew the green/magenta balance of the flash to match the output of common fluorescent lamps.