Our results imply that under equivalent and low screen luminance conditions, white light, 500 lux and color text were the better visual task setting conditions. Further, the effect size shows that the illumination intensity has the greatest impact on short-term visual tasks and text color has the most significant impact on long-term visual tasks. If yellow light is necessary (e.g. for the etching process in the photo area of semi-conductor factories), under equivalent screen luminance condition, it is better to use blue as the text color.