Blue light from electronic devices is bad for our health.  It deprives us of good sleep.  I try to stop all my work by 10 pm, so that I will be able to rest well by 11 pm.  It's not easy at all.  I use glasses (with power for short sight) that cut off the blue light, and another pair with amber lenses, that are supposed to reduce blue light from the tablet and the laptop.

"The negative effects of sleep deprivation are serious: sleep durations that are consistently shorter than 7 hours in a 24-hour period are associated with cardiovascular disease and diabetes risk factors, depression, automobile and workplace accidents, learning and memory problems, and an overall increase in mortality"

http://chriskresser.com/how-artificial-light-is-wrecking-your-sleep-and-what-to-do-about-it/

http://www.gunnars.com/how-they-work/

Hi Tolgahan,

I assume the "blue light" that is being referred to is transmitted from our smartphone, tablet, iPad etc.  If this is the case, beside light protector coating, we can adjust those devices into "night mode" or wearing special goggles.  You can refer to the following links for more details.  Wishing you all the best.

http://chriskresser.com/how-artificial-light-is-wrecking-your-sleep-and-what-to-do-about-it/

http://the-digital-reader.com/2015/06/27/the-better-way-to-read-at-night-on-your-tablet-ipad-or-smartphone/

http://www.fastcompany.com/3042717/sleep-week/8-ways-to-use-your-gadgets-at-night-and-still-get-a-good-nights-sleep

Regards,

Fung

the best you can do, better than filters whatsoever, is to reduce exposure.

Shorter times, dimmer screens, early switch off

As people before me, I am going to suggest several ways how you may lower the negative impact of blue part of the light spectrum:

1. When talking about electronical devices, you can use software filters - I believe they are available for all platforms - f.lux, Twilight,....

2. You can use special glasses with amber/red lenses which reduce the amount of short wavelengths - there are many types available on the martket

3. I've seen some "hardware" filters which you can directly attach onto the screen of your device

4. In your bedroom, just use bulbs with a lower CCT (correlated color temperature) value. 2700K bulbs emit less blue light than 6500K bulbs. 

Reducing "blue" output via filters or software features that make the screens appear yellowish are reasonable, but the circadian system can still be affected by "warm" light if the brightness/intensity is sufficiently high. Best to reduce screen brightness as well to the minimum for visibility, if screens must be used at night. There seems to be lots of focus on spectrum/color lately regarding circadian impacts of light and screens at night, but intensity is still the primary driving factor.