It's broken. 420 isn't green.

Okay the color should be super accurate right? I put in 589nm and it looked much yellower that I remembered (sodium spectrum, I had the impression they are orange.)

“Little Twelvetoes” from the classic album “Multiplication Rock”

You can get a pretty nice shade of magenta by combining 650nm and 473nm.

people whose favorite color is magenta are furious.

Gotta caliber your screen first, and then check if it can actually show the color chosen.

Screens have come a long way but there is a reason why expensive screens cost more.

What do you mean you don't know what 800nm light looks like?

Purple Haze, baby 😎

Try 808 too :)

Octarine?

809

Very interesting, thank you for this knowledge!

The base 10 number system wasn't universal for human civilization and certainly wasn't the first numeric system developed by humans. The sumerians used a base 60 counting system which they passed on to the Babylonians, which is why we we still measure our time and things like angles and coordinates in geometry by factors of 60. (Eg 60 seconds in a minute 60 minutes in an hour)

It originated by using our thumb to point to the 3 bones of our fingers, times that by 4 you get 12, times that by 5 fingers per batch of 12 and you get 60. (That last step at the end confuses me because it seems to contradict using your thumb to point to your 4 fingers but that's what the wiki seems to say)

https://en.m.wikipedia.org/wiki/Sexagesimal

Flow cytometry gang rise up

Schoolhouse Rock made a song about an alien with 6 digits on each limb; Was all about Base 12 number system.

Oh yay, Any chance to pimp Captain D

We have 10 fingers on our hands and the decimal system uses exactly 10 symbols to count. Imagine what we would of donr if we had 11 instead

700

This is useless in so many ways, but perhaps the most profound way that it is useless is that I already have goddamn eyes to tell me what color a wavelength of light is.

Before you do this, turn off any screen-adjustment settings like night mode or TrueTone. These will change how they look.

It's a cute idea... But ultimately I don't like it. First color I tried was 632 and it looked way way too orange. I know the color science and the gamut considerations and the dominant wavelength considerations, but it just doesn't seem to make a very good representation when it comes down to it. There's ways to perceptually change the gamut to make it look better, but this is one of those things where you just need a grating and a tungsten lamp

This is not how it works. Most monochromatic colors fall way outside the color gamut of a typical display, and are therefore impossible to show accurately.

For example, see this image: https://upload.wikimedia.org/wikipedia/commons/thumb/9/91/SRGB_chromaticity_CIE1931.svg/440px-SRGB_chromaticity_CIE1931.svg.png Your phone can probably show you all colors within the triangle. But monochromatic light traces the outline of the weird shape.

Yes

I want to do it the other way round & start off with brown & purple

Your experience is dependent on the color gamut of the display, and whether you ask for something that is in gamut or outside.