Red wavelength comparison (ADD YOURS)

[DJZ]

Looks like a rather old thread that got dug up, hope no one minds me adding to it. I took this pic many years ago. Both lasers were outputting 200mW, no modulation, just a straight 5V on the modulation line. Can you guess which one is 660nm and which is 635nm?!

 

[zyxwv99]

That's a great photo. Right looks like 635, left 650. Not only does it seem to capture the color difference, it even captures the luminosity difference (i.e., apparent brightness).