Department of Energy (DOE) as an energy savings strategy. The results of this study do not support the spectrally enhanced lighting (SEL) method advocated by the U.S. The conditions at 5000 K were judged to be too cool, especially for those who had daylight in their work areas. However, the increase in spatial brightness perception came with lower satisfaction, worse visual comfort, and worse self-reported productivity. The luminous conditions at 5000 K (visually cooler) were rated to be brighter than those at 3500 K (visually warmer), especially when higher lumen output was in place. The results from the EMA (60.0% response rate) and web-based (77.2% response rate) surveys were generally consistent, indicating that CCT significantly affected spatial brightness perception, visual comfort, satisfaction, and self-reported productivity. Participants also completed a web-based survey on the last day of each condition. In other words, lumens measure the amount of light your LED light puts out. The term lumen means light, which makes sense when you understand what this measures. This is different than Watts, which measure the amount of energy in a light. Two of the daily EMAs included questions about lighting. In LED lighting, lumens measure the brightness of a light. The distance and intensity of the Lumen count will work best on long distances. This is why larger areas can be illuminated, such as parking lots or athletic fields. The higher the amount of lumens, the more distance is given to adjust for the Lumen count. During the second week they completed ecological momentary assessments (EMAs) three times daily using smart phones. The scale is referring to the output of lumens measured within a square meter. Under each condition, participants adapted during the first week. Four lamp types were selected to create luminous conditions organized as a 2 × 2 factorial design, comprising two levels of CCT (i.e., 35 K) and lumen output (i.e., 2330 and ≈3000 lm). Ten of them had daylight access in their personal work areas. Twenty-six participants were recruited (mean age = 38.8 years age range = 23–55 years). A field study was performed to examine the effects of correlated color temperature (CCT) and lumen output of fluorescent lighting on office occupants' visual comfort, brightness perception, satisfaction, and self-reported productivity.
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