I read this article about how the blue lights of LEDs in our computers and phones is keeping us from sleeping and destroying our retinas. But it suggested a solution, a free app you can download to change the "temperature" of your device after sunset (or whenever) to have less blue light in the evening. It's called f.lux and I've been using it for the last two days. As I'm sitting here on my laptop (during your midterm) the screen slowly got less blue and more yellow because the sun had set. I think it's great. You can choose the effective blackbody temperature of your screen before and after sunset. I'm using 4000 K after sunset and 5900 K during the day.
Though it changes the hue (the wavelength dependence), I'm pretty sure it's not changing the flux per unit area by T^4. ;-)
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