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Abstract

This research investigated whether the amount of telepresence fill light required for a well-lit appearance was enough to cause discomfort glare. Thirty participants adjusted the output of two fill lights, one in front of them (focusing on discomfort), and one in front of the remote telepresence user (focusing on appearance). Ambient light levels (48–71 lux, 118–130 lux, 269–281 lux) and fill-light positions (top of display, 30.5 cm higher) were varied. For all conditions, the amount of light required to produce a pleasing portrayal was greater than the point of discomfort. The mean discomfort threshold was the same for all ambient light conditions (663.46 cd/m², 8.44 lux at 2.44 m). The amount of light that produced a well-lit appearance was about the same for dim and moderate ambient light (3,348.65 cd/m², 51.61 lux at 2.44 m), but lower for bright (1,204.47 cd/m², 17.81 lux at 2.44 m). Raising the light did not affect discomfort, but did require more light for a well-lit portrayal. Technology providers should consider collocating the fill light with the display, limiting its luminance to 663.46 cd/m² for low-light environments similar to this research, and raising or lowering that limit as the background luminance changes.

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Effects of Telepresence Light Height and Ambient Light on Glare and Appearance

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