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Originally Posted by xendula
^ Interesting. If true, then the Kobo Glo and Nook Glowlight would cause the same sleep deprivation, since they have a blue shine to them.
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The amount of light is as important (or more so) as the hue. The Lighting Research Centre study that people keep referencing (Wood et al 2012) had to crank a full-size LCD tablet light to full brightness and expose people close-up for two hours before any significant melatonin suppression took place. The glowing frontlit devices on low are putting far, far less light into your eyes.
Out of interest, I set my Kobo Glo to high brightness, and put it next to my laptop, matched the laptop's brightness, then fiddled with the laptop's F.lux settings until they matched. A match occurred at a colour temperature of about 5400-5500: warmer than daylight, and way warmer than standard LCD settings.