It has been difficult to differentiate statistically among lighting conditions. A questionnaire, using 12 positive adjectives, was developed which was sensitive enough to show differences among lighting variables. Twenty subjects each spent 20 minutes in each of 12 conditions. The 12 conditions were all combinations of screen glare (high and low), ambient light source (kiosk and kiosk + ceiling), and document luminance (25, 160 and 320 cd/m2). The criterion was put on a scale of 0–100%. Kiosk + ceiling lighting (score = 69%) was preferred to kiosk lighting (59%). Medium document brightness (73%) was preferred to high (63%) and low (56%). Low glare (67%) was preferred to high glare (61%).
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