New projector build. RGB

[sbk]

I'm just going by the numbers. Rayleigh scattering makes short-wavelength laser beams appear brighter, but math is math. Here's my source. A value of 1 is most visible and occurs right around 555nm. The curve is a bell extending downward from that peak. The fact that 473nm is closer to green is the reason it is more visible. The 445nm laser may appear more visible to you, but with short wavelengths this varies considerably from person to person. I feel that going by the numbers rather than you own perception will lead to better color balance for all eyes that may one day witness the glory of your projector.

According to this chart, a 532nm beam would be 8.5x brighter than a 473nm beam, and 30x brighter than 445... According to my own experience (at least with 473 and 532), I can tell that is wrong and is only pure theory and maths. There's certainly another important factor to take into account

[Atlewee]

Thank you for all your quick answers.
After seeing allthatwhichis 1W KVANT it makes me think about a commercial laser projector. It seems awsome, and probably even better in real life.
But this cost a lot of money. probably worth it, but still a lot of money =) Especially when adding control software on top of that price.

Is there other projectors in that power range that I should have a look at?

[ElektroFreak]

According to this chart, a 532nm beam would be 8.5x brighter than a 473nm beam, and 30x brighter than 445... According to my own experience (at least with 473 and 532), I can tell that is wrong and is only pure theory and maths. There's certainly another important factor to take into account

In a way you're absolutely correct. I really should have started of by stating that much of this is theory, since individual color sensitivity varies considerably form person to person. All data that I have seen regarding color sensitivity is intended to be an average for human beings in general. Your own perceptions may make some wavelengths appear much brighter to you than another person (and as I said Rayleigh scattering plays a bit into this in the blue-violet range).

As an example, according to that chart 670nm and 445nm are near the same relative brightness, but to me the 445 always looks MUCH brighter. For that matter, to me a beam at 405nm looks at least 10 times brigher than 671nm.

But I'm getting off-topic with this. Apologies to the OP.