| Summary: | 碩士 === 國防大學 === 運籌管理學系 === 105 === Light-emitting diodes (LEDs) do have many advantages and this advanced technology has been applied to replace traditional general illumination in various occasions. LED is a point light source and thus it is more probable to induce glare to disturb human's visual sensation. LED panel light has widely used the light guide technology to improve into a surface light source. Because the light emitting area becomes wider, users would not feel the effect of glare when the light shot directly into their eyes. The BOE, Bureau of Energy, of Ministry of Economic Affairs initiated the voluntary “Energy Label” program about the standard of indoor lighting (2012). With the development of LED panel lighting fixtures, the BOE announced the “Energy Label” program for the LED panel lighting fixtures (2015).
The first experiment was to investigate the effects of color temperature (6000K，4200K，3000K) and illuminance (300lux，750lux) on eyestrain (△CFF), searching performance (airplane graphics, and 12 and 6 pt size of numbers), and subjective evaluation. Eight participants were recruited. Different combinations of color temperature and illuminance did not affect △CFF or searching performance (airplane graphics and 12 pt size of numbers) significantly. As to search smaller size numbers (6 pt), female had better performance than male did; the influence of six combinations depended on gender. For subjective evaluation, in general, the combination of 6000K/750LUX was better. Additionally, the second experiment was designed to assess the subjective preferences among the same six combinations of color temperature and illuminance. The result indicated that 6000K and 4200K under 750 LUX was most preferred, and 3000K was the last one for female. Above results could be a reference for the LED lighting manufactures when they promote their products.
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