> In Japan, the stricter rules for passing the Harding Test have resulted in techniques known as “dimming” and “ghosting”.
These are also used in the UK, and in fact are automatically applied to video going through the broadcast chain, in order that live broadcasts are also considered "safe". If the system detects bright flashing at any point, the white point of the video is clamped down to a lower level, until the flashing has stopped.