If you read these pages regularly then you'll know I'm a huge fan of a freeware programme called Flux. It continually adjusts the colour scheme on your monitor so that it matches daylight conditions where you are (according to time, not weather). So during the day, when there's a lot of blue light around, your display will have a higher "colour temperature". As evening falls, the temperature is lowered so the display contains less blue light.
This helps avoid eye strain, and prevents you from being too "awake" if you use your computer shortly before you go to bed.
If you don't already use Flux, go get it now. It's free from www.justgetflux.com and a recent update has added some new tweaks, fixes and features. The interface is clearer, and if you're a user of Remote Desktop then you'll find that it works better with that too.
If you haven't come across colour temperature before, all you really need to know is that it's measured in degrees of Kelvin (K). Daylight is around 6000K. As the sun fades, the colour is nearer 4000K. You'll see these numbers marked on light bulbs when you buy them. If you like a really pure daylight white, you'll notice that your bulbs are probably marked as 6000K. The more subdued lighting, which looks slightly yellow,comes from bulbs with a temperature of around 3500K. So now you know.
Either way, just get flux. Your eyes will thank you.
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