400mW 640nm vs 1.1 watt 650nm - Pics and videos! ;)

[flecom]

but not very well as in real life the output is completely different.

because most of his power isnt hitting the mirrors perhaps?

[norty303]

because most of his power isnt hitting the mirrors perhaps?

Why do people use 'most' when in fact it's more like 'an itty bitty bit on the edges'?
I refuse to believe that 50% of the power is getting lost off the mirrors.

As a guideline Chroma is great for where to aim for, but it doesn't take into account power density in relation to important factors like diameter and divergence, and whilst it's clearly theoretically correct in it's calculations, real-world experience is telling us that combinations that simply shouldn't work very well, actually do.

[loopee]

Norty303

Nice comparison of the 640nm (I'm still waiting for mine!)

but not very well as in real life the output is completely different.

The problem here is that you have so many other variables that Chroma doesn’t/can’t calculate for, things like:

• The display you’re viewing it on (LCD backlights differ, color calibration differ, etc)
  
• The true measured power and wavelength output of the actual lasers
• Losses in optics and
• Your eyes responsiveness

Like flecom stated, it provides a method of quickly calculating luminance and displays expected color.


BTW, Tocket did list the limitations of Chroma

Limitations:

• Wavelengths are limited to 380 to 825 nm with 1 nm resolution (spline interpolated from 5 nm).
• The chromaticity diagram is converted to sRGB, which means that most colors are outside of its gamut (and thus not correctly displayed). Keep in mind that most computer displays can't even display the whole sRGB gamut.
• The calculated chromatic coordinates are only completely accurate for a beam reflected off a perfectly white surface. Viewing a beam in particle-free air will yield a different color due to strongly wavelength dependent Rayleigh scattering. In fog or haze the deviation will be far smaller as Mie scattering is only weakly wavelength dependent.

[Xytrell]

...80.4lm vs 43.6lm... says it should be almost twice as bright

But power is logarithmically proportional to perceived brightness, so it's closer to maybe 1.5 times as bright.

Isn't 650 a generic label for "red"? It may be 655, 658, or 660, right?

[CDBEAM]

OK...even though this will likely further lower the re-sale value of my Maxyz modules....the LW 640nm @ 430 mW does truly blow away the brightness of of the Maxyz 658nm @ 458mW duals....OH well...technology marches on !!!!! Hey....the Maxyz will burn thru electrical tape quicker !!!! hahahahaha !!

NOTE: I will sell the Maxyz's...very cheap !!! drop me a PM if interested !!

CDBEAM / Terrawatt

[flecom]

Why do people use 'most' when in fact it's more like 'an itty bitty bit on the edges'?
I refuse to believe that 50% of the power is getting lost off the mirrors.

maybe not off maxyz modules, but check out someones projector that has a red flashlight (650/635nm) and see how much power loss there is, I guarantee you its a lot

[ElektroFreak]

I'm using a nice fat 300mW 650nm multimode red in my RGB projector and the power after optics is around 200mW. Pretty much 1/3 of it gets lost in the optics and off the sides of the mirrors..

[FloggedSynapse]

according to chroma 1.1W @ 650 should be 80.4lm vs 43.6lm for 400mW of 642

so I am happy to see the difference is not that noticeable, even if the math says it should be almost twice as bright

Hm, I think part of the problem is the non-linear nature of our perception. It requires something like a 4-fold increase in power to appear twice as bright. 2x the power level will not appear twice as bright.

[CDBEAM]

When I look at the output of my LW 640nm @ 430mW vs the Mayxz 658nm @ 450 mW....My eye sez....The 640 is noticably brighter !!!.....That is my perception !!! Perhaps....mmmmm??
I have a " Golden Eye " hahahaha Nothing against Chroma !!!!....But is not response / perception based upon how close the nm is to 555nm....555nm being the peak response wavelength for the human eye !! so....640nm is closer to 555nm....so for equal power...640 will kick butt ??? I suppose I could/should tinker with Chroma.......but....
My eye sez the two side by side displays from Norty are equal in brightness....the 640 nm on the left has a slight more orange in it....I just refer to the "Wavelength Response Chart"...see below...pulled from SAMS Reference area....for what to expect in perceived luminosity.

Wavelength Response Color Typical Source/Application
-------------------------------------------------------------------------------
350 nm .00001? UV
380 nm .0002 Near UV
400 nm .0028 Border UV Nichia violet GaN laser diode
410 nm .0074 " "
420 nm .0175 Violet
442 nm .0398 Violet-blue Violet-blue line of HeCd laser
450 nm .0468 Blue
457.5 nm .0556 " Blue frequency doubled Nd:YVO4
457.9 nm .0562 " Blue line of argon ion laser
473 nm .104 " Blue frequency doubled Nd:YAG
488 nm .191 Green-blue Green-blue line of argon ion laser
500 nm .323 Blue-green
510 nm .503 Green Emerald green line of copper vapor laser
514.5 nm .588 " Green line of argon ion laser
532 nm .885 " Green frequency doubled Nd:YAG or Nd:YVO4
543.5 nm .974 " Green HeNe laser
550 nm .995 Yellow-green
555 nm 1.000 " Reference (peak) wavelength
567 nm .969 " Green line of Helium-Mercury laser
568 nm .964 " Y-G line of some krypton ion lasers
578 nm .889 Yellow Gold line of copper vapor laser
580 nm .870 "
594.1 nm .706 Orange-yellow Yellow HeNe laser
600 nm .631 Orange
611.9 nm .479 Red-orange Orange HeNe laser
615 nm .441 " Orange line of Helium-Mercury laser
627 nm .298 " Orange line of Gold Vapor Laser
632.8 nm .237 Orange-red Red HeNe laser
635 nm .217 " Laser diode (DVD, newer laser pointers)
640 nm .175 " "
645 nm .138 " "
647.1 nm .125 Red Red line of krypton or Ar/Kr ion laser
650 nm .107 " Laser diode (DVD, newer laser pointers)
655 nm .082 " Laser diode
660 nm .061 " "
670 nm .032 " Laser diode (UPC scanners, old pointers)
680 nm .017 "
685 nm .0119 Deep red
690 nm .0082 "
694.3 nm .006 " Ruby laser
700 nm .0041 Border IR
750 nm .00012 Near IR
780 nm .000015 " CD player/CDROM/LaserDisc laser diode
800 nm 3.7*10-6 " Laser diodes for pumping Nd:YAG, Nd:YVO4
850 nm 1.1*10-7 "
900 nm 3.2*10-9 "
1,064 nm 3*10-14 " Nd lasers (including YAG)
1,523.1 nm 0.0000 " IR HeNe laser
3,390 nm 0.0000 Mid-IR IR HeNe laser
10,600 nm 0.0000 Far-IR CO2 laser

[Stoney3K]

Maybe slightly OT here, but I'm pretty surprised by the difference of apparent brightness of 473nm and 488nm blues.

Add to that, the fact that 100mW+ argon heads are becoming cheaper since everyone wants a DPSS, guess what I'm going to use for my blue.

Sure, the main unit would probably be a bit bigger, more power consuming and needs a little more cooling, but if that means a brighter RGB show, I think it's totally worth it.