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大功率LED闪烁问题

我用LM3433EVB 驱动大功率LED(80-100W),50hz和60hz PWM驱动,用光电二极管测的灯的光电响应频率也是50hz和60hz,可是能看到明显的闪烁,根据视觉残留现象,50hz应该都不闪了啊  为什么还是能看到闪烁呢?是跟亮度有关系吗?用小的LED灯50hz就不闪,市场上电视的刷新频率也是60hz,为什么?求解释!