Abstract
Luminance adjustment is widely used to evaluate discomfort due to glare. This paper reports an experiment conducted to investigate two factors of the luminance adjustment procedure, stimulus range bias and direct vs indirect control. Stimulus range bias describes the influence on subjective evaluations of the range of stimuli available to the test observer, with range being the minimum and maximum available glare source luminance in the current context. For the glare source, an artificial window, there were three ranges, having maximum luminances of 5 106, 7288 and 9469 cd/m2. The results suggest that luminance range had a significant effect on settings made, sufficient to change settings by an amount equivalent to one step of a Hopkinson-like discomfort sensation scale. The mean luminance associated with just intolerable discomfort with the low range was less than that associated with just uncomfortable with the high range. Past experiments have used direct control, where the observer makes the adjustment directly, and indirect control, where the observer instructs the experimenter to make the adjustment actions. Both methods were used in the current experiment. It was found that range bias was larger when using direct control than with indirect control. These findings contribute to an understanding of why different studies of discomfort glare have reported different results and hence proposed different discomfort models.
Highlights
It is generally accepted that well daylit conditions provide comfortable and healthy environments [1], too much daylight in the form of glare can be a problem [2,3]
Indirect control reduced the size of range bias, it still exerts a practically signiicant efect on glare settings made to the same discomfort sensations
This paper describes an experiment investigating discomfort due to glare from an artiicial window. 42 test participants were instructed set the luminance associated with a particular discomfort sensation using a luminance adjustment procedure
Summary
It is generally accepted that well daylit conditions provide comfortable and healthy environments [1], too much daylight in the form of glare can be a problem [2,3]. One reason for this is we are, as yet, unable to conidently predict the degree of discomfort due to glare. This arises partly because past studies have given insuicient consideration to the experimental methodologies that were used. Range efects have been found to afect many sensory responses when using the adjustment procedure to meet a given subjective sensation, including preferred colour [18,19], preferred brightness levels [18,20], and perceived loudness [21,22]
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