Aputure Accent B7cTunable color wireless practical bulb with built in battery Light at the Flip of a Switch Accent B7c is a tunable color bulb with a standard E26 E27 socket designed for use on camera. With a wide color range and SSI of 85, it can match nearly any white light source or output rich colors. Rig and Roll Accent B7c bulbs contain a built in battery for over 70 minutes of power at max output. With AC power, Accent B7c behaves like a traditional bulb and