闪光灯发出的闪光是由储存于主电容中的电能转换的。每次闪光所释放的能量如下式所示：（焦耳）式中C是主电容的容量，单位为F（法拉）；V、VO分别为主电容的工作电压和闪光放电后的剩余电压，单位为V（伏）。常用小型闪光灯（包括机载闪光灯）的主电容容量在160μF～800μF之 The flash emitted by the flash is converted by the electrical energy stored in the main capacitor. The energy released by each flash is as follows: (Joule) where C is the capacitance of the main capacitor in F (farad); V and VO are the operating voltage of the main capacitor and the residual voltage after the flash discharge, respectively, in units of V (volts). Commonly used small flash (including on-board flash) the main capacitor capacity of 160μF ~ 800μF of