The Frezzolini Spreader/Diffuser & 3200K to 5600K Filter works with both Micro Fill on-camera lights and the 10W & 15W versions of the Micro-Sun Gun HMI. The spreader/diffuser spreads light about 90% wider than the lamp does on its own, and meanwhile softens the light.
This assembly also features a flip-down filter that converts the color temperature of Micro Fill lights from 3200K to 5600K daylight. This color-correction filter is especially useful if you're shooting outdoors with a Micro Fill.