Output Recipe for a RGB Laser

[PackCat]

I am looking at various RGB entertainment Lasers, but I am confused by their quotients and power output mixtures.
I would summize to say, a perfect recipe would create a nearly pure white light output of RGB.

In my experience, the lower blue range needs an exponential multiplier to create the same amout of visible light as green or red beams do...

Some examples:
600mw RGB:
300mw @ 635nm (red)
200mw @ 532nm (green)
100mw @ 473nm (blue)

500mw RGB:
200mw @ 635nm (red)
100mw @ 532nm (green)
100mw @ 473nm (blue)

1000mw RGB:
800mw @ 635nm (red)
200mw @ 532nm (green)
100mw @ 473nm (blue)

How could all 3 RGB lasers create a similar presentation? albeit (different sized rooms and ambient light allowed)
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Is there a recipe that dictates what the fractional percentages should be for each color using (635nm, 532nm, & 473nm) beams, to create a true RGB?

Thanks in advance,
john

 

[karlthev]

No expert by any means on this one however, as the human eye is used in measuring light levels and, we know that the human eye is most sensitive to Green and less so Red and Blue, I would suggest that you consult a chart giving some "normal" human eye sensitivities to the various electromagnetic visual light spectrums and then chart those sensitivities to establish what percentages of each individual light display (intensities) are needed. Each eye will have its own variances from the "norm" however there should be an "average" sensitivity range (s) identified. There is yet another factor of the bottom "threshold" of the eye in terms of seeing any light whatsoever. As we are aware (or not!), there are basically two different types of cells in the eye which are responsible for vision (at least for the purpose of this dioscussion)--the rods and the cones. The cones provide us with color vision and are useful in higher intensities, the rods give us low light vision but that same vision relegated to greys.


Karl

 

[allthatwhichis]

From my experience a good ratio is g1:b2:r4, depending on what wavelength of R and B you are using. That scale is for 635R and 473B. I think I am running a 1:2:5 ratio with 660R. There are several threads on this topic over at photonlexicon. Here is a good thread to start with. It links to several others.

 

[Athoul]

4:1:2 of R/G/B as mentioned is a very good ratio and should work very well.