S.A.D. Vocabulary: Words you need to know
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Kelvin: To find the bulb that will meet your color needs, you'll need to choose the right Kelvin (K), or color temperature. The warm colors of Standard Bulbs are between 2700 and 3000 Kelvin.
For example, Halogen Bulbs are 2700 Kelvin, a yellow light, close to morning sunshine. By contrast, light at 5000 Kelvin is very white, like high noon in July.
Higher Kelvins create an afternoon light that has a bluer, more relaxing color. The term daylight applies to fluorescent bulbs at 6500 Kelvin, as well as LED bulbs at 4000K, 5000K and 6500K. You'll need to read the box of each bulb to find the color temperature that's right for you.
CRI: CRI means Color Rending Index. Sunshine in any season has a CRI of 100. The common F32T88/4100K cool white lamps and Compact Fluorescent bulbs have a CRI of 82. Low CRI is one reason colors look funny under fluorescent lamps and the reason many people experience headaches when using these bulbs.
I call a Light bulb with a CRI of 92 or higher, Full Spectrum. Sunlan offers several bulbs with a 90+ CRI. They include Neodymium, Halogen, some LED bulbs, and Liner Fluorescents in several lengths.
LUX: Lux is a measurement of Lumens at a given distance from a light source. As you move away from the light, the number of Lux decreases. Seasonal Affective Disorder (SAD) products commonly advertise 10,000 Lux at 2 feet from fluorescent bulbs.
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