[teruakohatu]

It seems the harder difficulty is red and yellow, see the comments in this article, but led lights have improved the situation for some:

https://www.color-blindness.com/2007/02/06/colorblind-at-the...

[NegativeK]

There are a few different types of colorblindness, so I wouldn't extrapolate that.

For me personally, the green light looks much closer to a white than to, say, the green of a grass.

[smolder]

I just happen to have a friend with red-green blindness, who was my reference point in answering. It's good to point out there are different types with different impacts, though.