When you fire your flash unit, it releases all of the energy stored in its flash capacitors in order to emit the flash of light. Before you can fire the unit again, the capacitors must have time to recycle, or build up enough energy in the capacitors in order to fire again. AlienBee flash units boast extremely fast recycle times, which are lessened as you decrease the flashpower. On the X-Series X800 unit, for example, the unit may be used at full power and will recycle in under 1 second! Fast recycle times are important for rapid shooting, as you can take shot after shot without pausing to wait for your flash unit to keep up.