I am doing a bit of B&W film testing using fluorescent lighting. It suddenly occurred to me that in the USA the lights will flicker at 120 Hz, twice the line frequency. At slow speeds this shouldn't matter, but at higher shutter speeds (perhaps 1/60 or 1/125 and beyond) there will be uneven lighting at various points in the film plane due to this flicker. This could throw off the film testing somewhat if the flicker is very prominent. If the phosphors have a long phosphorescent lifetime then the flicker will be negligible. However, if the phosphors have a short phosphorescent lifetime then the flicker will be prominent. Does anyone know how bad the fluorescent light flicker really is and whether it is prominent enough to affect film testing at high shutter speeds?