INFLUENCE OF FREQUENCY, WAVEFORM AND COLOUR ON THE VISIBILITY OF THE PHANTOM ARRAY EFFECT (OP23, 138-146)

One of the temporal light artefacts, which can occur in temporally modulated light systems, is the phantom array effect, also known as ghosting. This paper studies the influence of frequency, waveform and colour of light output of a LED source on the visibility of the phantom array effect. Results indicate that the visibility of this effect depends on frequency, following a U-shape form, with the effect being most visible at around 600 Hz. Next to that, the phantom array effect is more readily perceived when the light waveform is square, compared to sinusoidal wave. The results also show how the visibility of the phantom array effect depends on the colour of light output; blue light results in less visible effect, compared to red and white light.