4 ms·
I'm tempted to experiment. If I take a blue LED and a green LED in the dark, when I focus on one the other should appear blurred.
by aimor 5y ago
I'm tempted to experiment. If I take a blue LED and a green LED in the dark, when I focus on one the other should appear blurred.
- klodolph 5y agoMy experience is that in the dark, I can't focus on a blue LED at all. It will just look a bit blurry.
- floatrock 5y agoBlue LED clocks (like on 'high end' microwaves or appliances) are one of my biggest pet peeve. I'm not an old fart by any stretch -- my eyes are fine -- but the blue blur when looking at the clock at night is a real thing. Fun fact: this phenomenon is similar to why older cars had yellow-tinged fog lights. It's partly light scattering in suspended water droplets (fog), it's partly the perception factors talked about in the article, but basically reds and yellows have lowest "light scatter". You're not gonna build a red foglight for red-is-danger reasons, so yellow foglights are the next best thing.
- SomeHacker44 5y agoYep, exactly. Scattering of light is proportional to the fourth power of the frequency (or, equivalently, inversely proportional to the fourth power of the wavelength). I've been telling this to my kids whenever I got the inevitable "why is the sky blue" line. :)
- gompertz 5y agoMajor pet peeve of mine too.... Blue leds on appliances are an instant deal breaker for me. Green looks cheap. Fortunately starting to see some white led displays on appliances, but hard to come across still.