In an article published to LED Magazine on April 1, 2016, Peter Shackle describes improving flicker characteristics with new “AC-LED” technology.  The technology appears to be a race to the bottom in terms of costs at the expense of those sensitive to flicker.  Unfortunately, the targets appear to based on the flawed notion that flicker of 200 Hz and higher is imperceptible to the human brain.  He writes:

A consistent picture emerges here. Half of human beings cannot perceive flicker above 60 Hz as documented by the LRC, yet the work of Berman shows that frequencies up to 200 Hz are indeed being transmitted to the brain, and Jaen confirms that visual performance is degraded even when subjects cannot perceive the flicker. The 200-Hz limit corresponds to a frequency having a time period of 5 msec (milliseconds), which makes the point that a gap in a waveform on the order of, say, 2 msec or less will be imperceptible because the human eye cannot detect and signal the existence of such fast events. This knowledge can serve as the basis of a circuit that achieves simultaneously low flicker index and high power factor.

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