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I am trying to build my own flickering light stimulation device. The light source will be a COB Red LED cluster (~627nm) (like one of these) with brightness controlled using Pulse Width Modulation through an Arduino.

This article mentions that using a square wave to drive the light source leads to harmonics in the SSVEP. This suggests that I should use a waveform that is close to sinusoidal.

Considering the luminous efficiency function of the human eye how should I modify this waveform so that the subjective "brightness" perceived by the generalized human eye is sinusoidal?

If this question is not sufficiently focused, please advise in the comments and I will edit accordingly.

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