What's the wavelength of pure blue?

[zyxwv99]

Obviously there can be color shift due to differences in brightness, not to mention color environment, body temperature, etc., but I'm going with 460nm.

447nm is indigo, except in a laser of more than 1mW, when it will shift towards blue because of Bezold–Brücke. (Bezold?Brücke shift - Wikipedia, the free encyclopedia)

473nm is part-way between blue and sky blue, which is something else altogether.

 

[Atomicrox]

@zyxwv99: I had noticed that effect before, good to know it has a name

Results so far:
votes: 37
average: 457.7nm
standard deviation: 8.4nm

 

[Teslanium]

I chose 460 as a nice "mid" blue. 450 is more "cobalt" blue, and 470 begins to me to have just a bit of cyan added, but still a nice color.

Of course, ALL visible single-spectral-line colors look good to me!op:

2c,
T.

 

[BurningLaserGuy]

I voted for 460nm... I personally think 445nm is to dark.