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4 current study. Lux is the intensity of illumination at a given location. Lumens refers to the amount of light radiated from a light source. These two concepts are related but are not interchangeable because lux varies depending on the distance from the light source as well as the angle of the beam of light, while lumens does not. Color temperature is a measure that helps indicate the color of the light. Color temperature is measured in Kelvins. Typical household lightbulbs may vary from 2000°K to 6500°K. Most 2000°K lights are warm in tone and are categorized by their yellow glow. 3100°K lights are “cool whites,” a cool-toned, slightly blue white lights, and 4600°K and above are considered “daylight” style lights. These daylight lightbulbs that are still primarily white but with even more blue in their tone, making them a more accurate imitation of actual sunlight on a sunny day. Color wavelength is another measure to indicate the color of a light. Different light sources have differing wavelength combinations of light, measured in nanometers. Spikes of energy at different wavelengths change the overall appearance of the color of a light, as well as the color rendering index of the objects it illuminates. Spectral power distributions (SPD) of various wavelengths, ultimately determine the color of the light. However, wavelength and color temperature are different entities. Lights vary in the intensity where specific nanometers peak, ultimately combining into something that converts into a color that can be measured in Kelvins. To preview, one of the lights used in the current experiment for the blue condition was 470nm, thus it had no other wavelengths compromising the color. As a result, the blue light was a concentrated form, atypical for most household lightbulbs.PDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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