Mettle 600W 600 True WS Dual Power AC/DC 110v Monolight Flash with Battery Pack Bowens Compatible The Cowboy Studio Dual Power AC/DC 110v Mettle 600W Flash, Indoor/Outdoor Professional Strobe Flash Light, with Rechargeable Battery Pack is used in photography to produces an instantaneous flash of artificial light at a color temperature of about 5500 K to help illuminate a scene.