Different color "505" laser modules

[Thefudger]

I ordered 505nm modules off of ebay and they have distinctly different wavelengths. Power out of the box was a touch different so I brought the dimmer one up to be the same as the brighter and then turned it up even more and no color shift. Cans look identical, drivers are identical, everything else completely identical. Any ideas? Tried searching for anything similar and came up dry. If there's a thread please shoot me a link.
Images are the two "505"'s and then a lineup of 488, "505" "505" and 532. It doesn't show up amazingly on camera but hopefully you can see the dimmer (previously the brighter of the pair) is more blue and the brighter a bit more green/yellow

My only guess would be they mixed up a 505 and a 520 but I would expect more of a difference. Unfortunately I don't have a reference 520

 

[Gryphon]

A lot of the 505nm diodes vary in wavelength quite a lot. I’ve got ones ranging from 499nm all the up to 513nm so it’s not uncommon for some to appear more blue while others are more green

 

[CurtisOliver]

I have 497nm up to 507nm in variation. 505nm diodes do have quite some variance. And being in a noticeable area of spectrum the difference can be obvious.

 

[Thefudger]

I have 497nm up to 507nm in variation. 505nm diodes do have quite some variance. And being in a noticeable area of spectrum the difference can be obvious.

Thanks! I had no idea, do you know off the top of your head others with a noticable variance? I've never seen any in the 450's and 660's I have multiples of.

 

[ZRaffleticket]

The sharp 488s have a similar variance, 482-495nm. Can also look at some cheap dpss modules from 550-565nm on ebay as those have some noticeable variance.

425nm could to a lesser degree, though those are way more expensive and most tend to be around 425nm. One of 7 I bought was 420 which is noticeable.

450, 405, 520, 635 and 660, even if some diode does, the color wouldn't be too different due to where it sits in human vision. Look up a color gamut chart with wavelengths shown, wider ranges of color per nm are places to look. Edit: for rgb, this is a consequence of design to center the colors in spaces that allow for variance for similar results in order to cover a large gamut

 

[CurtisOliver]

As Zack said, areas of the spectrum where the eye’s sensitivity to wavelength change is going to highlight variance more than areas where we are not as sensitive. For reference parts of the spectrum where the cones crossover are the most sensitive. Yellow (Lime green to orange) and Cyan (Light blue to teal) are the most responsive. Blue, green and the especially red can take 5nm or more to register a noticeable difference. Where more noticeable regions can be distinguished side by side even at less than 2nm apart. All diodes have variance. Nearly all spec sheets will state +/- 5nm on the central. Therefore for a 488nm diode (483-493nm) is a huge difference in colour. 650nm (645-655nm) you would highly struggle to see a change.

 

[CoolLaserUser]

I ordered 505nm modules off of ebay and they have distinctly different wavelengths. Power out of the box was a touch different so I brought the dimmer one up to be the same as the brighter and then turned it up even more and no color shift. Cans look identical, drivers are identical, everything else completely identical. Any ideas? Tried searching for anything similar and came up dry. If there's a thread please shoot me a link.
Images are the two "505"'s and then a lineup of 488, "505" "505" and 532. It doesn't show up amazingly on camera but hopefully you can see the dimmer (previously the brighter of the pair) is more blue and the brighter a bit more green/yellow

My only guess would be they mixed up a 505 and a 520 but I would expect more of a difference. Unfortunately I don't have a reference 520

My 498nm laser pointer literally looks like the same color of the first picture (the left one).