大家普遍了解色溫較高的光源比色溫低的光源來的容易使人警覺度提高，但卻鮮少有人探討或定義色溫相差多少即會有顯著的警覺度提升。本研究採用實驗室自製10種色溫，照度為325勒克斯的光源，並實際於下午時段施行腦波量測的人因實驗，藉此觀察受測者在接受不同光源後警覺度客觀的變化，並將結果以色溫低到色溫高配對出8組色溫對，另外亦將光源以c/p值量化，再透過內插法及拋物線方程式找出兩組可供預測其他色溫狀況的方程式。實驗結果亦發現，在警覺度達顯著提升的狀況下，色溫為5500K及6500K時所需提昇的色溫差最小，而這個色溫亦是我們日常工作環境中最頻繁接觸到的光源色溫。

Higher correlated color temperature (CCT) of lighting induces higher arousal level. However, what is the CCT increment for a given CCT to significantly increase the arousal level. This issue is hardly discussed. However, it is important to increase arousal level via changing the CCT or circadian to photometry ratio (c/p value) of the lighting condition. In our experiment, each of 8 different CCTs (TL,i) having 325±50lux at subject’s eye level is increased to TH,i, i=1,8 to induce just significantly higher alertness level. Using linear interpolation and the c/p values of these 8 pair of CCTs, we may estimate the corresponding TH to have significant alertness raise for any given TL not in our experiments. Besides, the lighting conditions of CCT in 5500K and 6500K have only the smallest CCT increment 2000K to have significantly increasing alertness level, and these CCTs are the closest CCT as our daylight and indoor lighting during the day.

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