Figure 6. Comparison of alertness level before and after the trial between light sources

From

Effects of Light’s Colour Temperatures on Visual Comfort Level, Task Performances, and Alertness among Students

B.M.T Shamsul, C.C. Sia, Y.G Ng, K. Karmegan

American Journal of Public Health Research. 2013, 1(7), 159-165 doi:10.12691/ajphr-1-7-3