The Briese Yellow Cube 2400 i with 2400ws is reliable, has a short flash duration up to 1/4545 sec and high repeat accuracy. The Yellow Cube series from Briese has 2 lamp outputs, and is adjustable in 1/4 steps via 4 f-stops. They are known for their fast recharging. The devices are very robust and resilient. The lamp outputs can be operated in parallel, whereby the 25% channel outputs 2 f-stops less power than the 100% channel. The modelling lamp can be controlled separately from the flash. On the 25% channel, you can still operate the modelling lamp in 100% (650W) to have enough modelling light for focusing. A photocell is built-in. Sync sockets are 6,3mm. Adjustable recharging time to protect the fuses in locations with weak electricity network.