CONVENTIONAL FLASH VS. IGBT CONTROL Geschrieben am 24 September 2017 Durch Paul. C. Buff 0 CONVENTIONAL FLASH VS. IGBT CONTROL Conventional Variable Voltage Control: Figures 1 and 2 show the flash waveform from a conventional variable voltage monoflash. As power is reduced, both the t.5 and t.1 flash durations become longer as power is reduced. Note that even beyond the t.1 point the flash continues to trail off slowly, adding motion blur. The color temperature drops as power is reduced. Einstein E640 IGBT Control: In Figures 3 and 4 below, notice the flash abruptly shuts off at whatever point is needed to produce the desired output. The t.1 flash durations can be as fast as 1/13,500 second at low power, producing crisp action freezing. But the color temperature rises as power is reduced. This depicts the Einstein Action Mode. In the Constant Color Mode, the Einstein processor compensates by adjusting both the shutoff time and the voltage such that a constant 5600ºK color is achieved. The flash duration drops less rapidly as power is reduced, but still produces very short t.1 times (1/8000 second at minimum power) and extremely sharp action freezing.