Dipping my toe in the pool of RGB

[Carl B]

Hi People

Hopefully should be taking delivery of the BLUE and RED from Mark (Fluff) this week and have borrowed a hazer from Karl (Banthai) for the photo shoot. Thanks for that Karl.

In the mean time would someone be kind enough to run the two laser setups listed below through the Chroma program.

setup 1
532nm - 180mW
473nm - 135mW
671nm - 330mW

setup 2
as above plus 642nm - 150mW.

Thanks in advance to any volunteers

Carl

[Carl B]

Got a PM from Fluff today and the lasers are in transit and should be in my hands tomorrow.

In the mean time I was having a little play tonight with the 180mW CNI green and my 7mW red HeNe. I pointed the green through a line grating giving me a line of green spots on the room wall. Then with the Red I pointed it at number of the green spots to see what shades of yellow I got. With the green spots from the grating varying in intensity I got to see colours from Orange to Yellow to Lemon/Lime Green. I even pointed the Red and Green without grating onto the same point on the wall and could still see the colour move towards yellow. It was very interesting to see that only a small amount of Red was needed to make a notable change in colour.

I'm sorry but never thought to take any photos but will do tomorrow when I start playing with the new Red and Blue with the Green plus I'll set up what I did tonight with the HeNe again and show you the results.

Carl

[soforene]

blah blah blah ....

Steady on Son.
You were interesting with the Laser Harp and now you are babbling about different coloured dots on a wall.
Have a lie down for a while.
Sounds like you need one.

[Carl B]

Hey Soforene.

The laser harp is still an ongoing project but this little obsession with playing with colours is at the forefront of my curiosity at the moment. There are so many routes of distraction in this hobby. I'm sure you understand.

Carl

[White-Light]

You're well into a green heavy balance Carl:




It would take around 1.5 Watts red at 671 to balance it to white so it looks like you're going to have to scale back green in the software to achieve a better balance. White looks impossible without more red.

[White-Light]

I've re-run it through Chroma reducing 532 to 90mw. Still couldn't get a balance though. Perfectly centred vertically but still heavily biased into the blue / green area on the X axis.

Its the 671 thats the problem. To achieve a good white balance I had to up this to 800mw despite dropping 532nm to 90mw!

Only advice I could offer is go down in wavelength on the red, changing it to 650nm red at 330mw gives an absolutely perfect balance with 90mw green and 135mw blue.

650nm red substituted:

[Carl B]

Thanks White Light.

I was expecting to be Green heavy. But regards the Red I'm thinking of cubing it with 100 - 150mW of 642nm when funds permit it. How would that look on the Chroma graph?

Carl

[White-Light]

Keep the green modulated down to 90mw and its absolutely perfect with 150mw of 642 added:



To summarise:

90mw 532
330mw 671
135mw 473
150mw 642

My short experience with Tockets utlility suggests that white light requires a lot of red, far more than blue as both blue and green shift the balance to the left so the red is having to counteract the pull of both other lasers.

[allthatwhichis]

I forgot I don't have the newest chroma installed... I don't agree with the results of mine, either before optics (rated) or after:

before optics (rated)
532 - 300
640 - 300
445 - 500

after(real measurements take at aperature)
532 - 300(ish)
640 - 250
445 - 380

If you run those they look very blue, and to me the white is close to perfect. Blueish maybe but nothing like the results shown.

So Carl, did you call into sick for tomorrow?

[Carl B]

Thanks Again Whit Light. That's looking real good.

The Blue and Red landed today and what a change it is to see colours other than Green. Had a little play as soon as I got home. I pointed them at the same point on the wall and I was looking at a sort of White light. It was a sort of cool White with a ting of Green but not as much as I was expecting. I will get the hazer and camera out and get a bundle of photos post tonight.

Carl