Another color balance question...

[Dr Laser]

I always go by 1(green)x1.2(blue)x2(red) ratio for 635nm 1x1.2x4 for 650nm
1x1.2x6 for 660nm and by 8 for 671nm. If you combining for example 300red @ 635 with 800mw @ 650 the result will be 500mw @ 635nm. to balance this out you will need 250 green and 300 blue. And the total power of this projector will be 1W of visible RGB.......No it will not make 1.6W.

[mixedgas]

Ah we are approaching convergence in the numbersand starting to get a correlation. This is good.

And Pitts, the die size or energy density in the low cost 645 diodes is not down to where it is in the 658s, so when you collimate it, things are fat. You are seeing the "donut effect"
And you are correct.


Yoda say, Paduwon Learner Stuka, you have in questioning well done.

3 hard working research types and one professional geek(me) got headaches and did math for free, thus it was a good question!

Steve

[mixedgas]

"And the total power of this projector will be 1W of visible RGB.......No it will not make 1.6W.[/QUOTE]

Least we have any confusion, lets phrase that correctly shall we?, radiometric power (Ptot) will be 1.6 watts, Total Visual Effective power, (PVeff)=1 watt, the energy does not cancel, the eye just doesnt use the long wavelengths well.

Steve

[Stuka]

...

Yoda say, Paduwon Learner Stuka, you have in questioning well done.

3 hard working research types and one professional geek(me) got headaches and did math for free, thus it was a good question!

Steve

Glad I could be the source for the mental challenge taken on by such a learned audience, oh Master ObiYodaMixedGas.....

[Jem]

400mW 532nm
400mW 660nm
550mW 635nm
500mW 473nm

So, now I want, err... No, i'll rephrase that... Now I *NEED* to add some 445nm deep blue to the above. How much do I need and will it throw the colour balance out by a lot?

Jem

[tocket]

another matlab user! I guess we know who the PhD candidate is. seems like our numbers agree relatively well.

Matlab rocks! It's been almost a year since I last used it, so my skills are pretty rusty I noticed.

I need to figure out how to account for scattering effects though. Is scattering simply I ∝ 1/λ^4?

So, now I want, err... No, i'll rephrase that... Now I *NEED* to add some 445nm deep blue to the above. How much do I need and will it throw the colour balance out by a lot?

Ok, this is going to sound weird, but I actually get a good color balance using less 445nm than is required with 473nm. Here are the numbers:
400mW 532nm
400mW 660nm
400mW 635nm
250mW 445nm

Makes you wonder if you're doing something wrong, but according to CIE 1931 this gives a white point of about 5500K. I do believe you get a good white out of this, but the problem is that the blue is going to be much weaker than the other colors. I guess adding a little red and green to the blue will make it more powerful while still keeping it blue.