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8 Despite all of the advantages, traditional 10,000 lux SAD lamps are not exclusively beneficial. There is evidence that the light that they emit is too bright to the point of distraction and discomfort (Anderson et al., 2016). In these cases, the light is actually detrimental. When lights are too bright they begin to show negative influences on certain cognitive functions, such as delayed reaction times in attention tasks (Min, Jung, Kim, & Park, 2013). A different experiment found that the level of physiological agitation (i.e., increased heart rate and skin conductance) can be manipulated through the brightness of a light (Sugimoto and Hataoka, 1986). Another study showed that a higher color temperature led to less favorable mood ratings (Smolders & de Kort, 2017). This would imply that the current use of SAD lamps that imitate sunlight as closely as possible instead of using a dimmer light, may actually end up making people feel less positive, a hypothesis in opposition to the “therapeutic” ideal of a light therapy lamp. 1.4 The Current Study 1.4.1 Rationale Although a fair amount of research has been devoted to comparing white light versus blue light in terms of using light therapy to decrease SAD, there are few studies that also include a third, control condition. As a result, it remains difficult to determine the magnitude of effects of SAD lights relative to light that we are normally exposed to on a daily basis. In addition, it has been shown that the effects of SAD lamps are not always beneficial or therapeutic, especially since some of their shortcomings seem to be rectified by using a lower-intensity blue light instead. Therefore, it important to expand research in this area. Finally, while previous studies have either focused on how these lights might help treat SAD, or how they influence one specific aspect of cognition, no previous study has explored the effects of such lights on a broad range of basic psychological processes. The current study involved manipulations of interior lighting in order to study how lighting can influence emotion, cognition, and basic physiology. Three different lighting conditions were tested in a within-subjects design: light therapy (10,000 lux, full-PDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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