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5 Figure 1: Spectral Power Distributions of Two Lights (SPD Samples, 2018) This figure highlights the difference between natural sunlight and a 4000K fluorescent light. The intensity of different wavelengths of light is shown to be variable depending on the specific type of light source. Lights considered full spectrum are closer to 5600°K, but there is no official standard for what is considered full spectrum. Full spectrum bulbs use a higher color temperature in order to more accurately imitate sunlight, which can get up to 10,000°K on a very sunny day and hovers around 4000°K for regular, direct sunlight. 1.3.2 Seasonal Affective Disorder A specific sub-category of lights is often used to treat a relatively common condition known as Seasonal Affective Disorder (SAD). SAD refers to a reoccurring state of depression brought on by a shift in the seasons, particularly during the gray winter months of the year (Melrose, 2015). Symptoms include increased sadness, sleepiness, and appetite, as well as a lack of energy, and potentially an increase in suicidal thoughts. It is theorized that SAD occurs because the days in the winter months have a shorter photoperiod (period of daylight hours) than in the summer, shifting circadian rhythms (Boyce & Hopwood, 2013). It has also been theorized that onePDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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