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FrozenGate by Avery

Holy @#$%... $100 488nm diode!!

Re: Holy @#$%... $120 488nm diode!!

ZRaffleticket said:
Edit: Just so everyone is aware, as someone who got his hands on one of the 473nm diodes styropyro got a while back, these will probably fluctuate wavelength a good bit per power. The more you give them, the greener they'll be.
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That was right with DoRam 488 nm too.
 





Re: Holy @#$%... $120 488nm diode!!

astralist said:
488_vs_473.png
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Have not seen both 473 & 488 for awhile but they're much better than this picture :tinfoil:
 
Re: Holy @#$%... $120 488nm diode!!

astralist said:
WOW!! i want one!!
But, it could have been a typo and really is 750 GBP LOL :na:

BONUS:
488_vs_447.png


488_vs_465.png


488_vs_473.png


488_vs_520.png


488_vs_532.png
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I've been thinking about those. I've seen 445, 450, 473, 488, 520 and 532. The 488 did not seem brighter than 520 or 532. Considering that 555 is at the peak during the day, I'd expect the 520 and 532 to also appear brighter.
 
Re: Holy @#$%... $120 488nm diode!!

Dr_Evil said:
I've been thinking about those. I've seen 445, 450, 473, 488, 520 and 532. The 488 did not seem brighter than 520 or 532. Considering that 555 is at the peak during the day, I'd expect the 520 and 532 to also appear brighter.
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He is using the 1951 scotopic vision chart -- scotopic vision is produced exclusively through rod cells which are most sensitive to wavelengths of light around 505 nm (green-blue) and are insensitive to wavelengths longer than about 640 nm (red). The sensitivity to light in scotopic vision varies with wavelength, though the perception is essentially black-and-white. The Purkinje shift is the relation between the absorption maximum of rhodopsin, reaching a maximum at about 500 nm, and that of the opsins in the long-wavelength and medium-wavelength cones that dominate in photopic vision, about 555 nm---so the relative brightness calculations don't reflect actual subjective human vision/perception in the real world.

As one member put it here in post #29 here: http://laserpointerforums.com/f44/new-tool-calculate-relative-brightness-wavelengths-nm-61238-2.html
"There is one glitch with the scotopic curve where lasers are concerned, however - it is rather unlikely for a person to view a typical laser beam using scotopic vision! In fact, I can't remember EVER viewing a laser beam with scotopic vision!
Here's a big hint...if you can even vaguely tell what color the laser beam is, then you are not seeing it with scotopic vision!
What you are using when you view a laser beam under subdued or nighttime conditions (but can still tell what color it is), is mixed-mode vision (both rods & cones active).
In this case, the response curve is the combination of both the photopic and scotopic curves! The relative ratio of each will depend on how active each visual system is - the darker it is, the more it will shift away from photopic and towards scotopic."
 
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Re: Holy @#$%... $120 488nm diode!!

Man I hope it's not a typo, I want 2 ASAP!
 
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Re: Holy @#$%... $120 488nm diode!!

This is wonderful news, I'm probably in for a GB!
 
Re: Holy @#$%... $120 488nm diode!!

Hopefully that just means a wait until Sunday night/Monday. I'm in for two.
 
Re: Holy @#$%... $120 488nm diode!!

Encap said:
He is using the 1951 scotopic vision chart -- scotopic vision is produced exclusively through rod cells which are most sensitive to wavelengths of light around 505 nm (green-blue) and are insensitive to wavelengths longer than about 640 nm (red). The sensitivity to light in scotopic vision varies with wavelength, though the perception is essentially black-and-white. The Purkinje shift is the relation between the absorption maximum of rhodopsin, reaching a maximum at about 500 nm, and that of the opsins in the long-wavelength and medium-wavelength cones that dominate in photopic vision, about 555 nm---so the relative brightness calculations don't reflect actual subjective human vision/perception in the real world.

As one member put it here in post #29 here: http://laserpointerforums.com/f44/new-tool-calculate-relative-brightness-wavelengths-nm-61238-2.html
"There is one glitch with the scotopic curve where lasers are concerned, however - it is rather unlikely for a person to view a typical laser beam using scotopic vision! In fact, I can't remember EVER viewing a laser beam with scotopic vision!
Here's a big hint...if you can even vaguely tell what color the laser beam is, then you are not seeing it with scotopic vision!
What you are using when you view a laser beam under subdued or nighttime conditions (but can still tell what color it is), is mixed-mode vision (both rods & cones active).
In this case, the response curve is the combination of both the photopic and scotopic curves! The relative ratio of each will depend on how active each visual system is - the darker it is, the more it will shift away from photopic and towards scotopic."
Click to expand...

Interesting. For me, viewing a low powered 405 in a dark room mostly renders it as grey, perhaps that's one of the only cases it comes into effect.
 
Re: Holy @#$%... $120 488nm diode!!

trencheel303 said:
Interesting. For me, viewing a low powered 405 in a dark room mostly renders it as grey, perhaps that's one of the only cases it comes into effect.
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Agreed, only time I've ever seen a gray beam was my "5mW" 405 wish night vision adjusted, and sometimes my lower powered 473 labby when it's just warming up.
 
Re: Holy @#$%... $120 488nm diode!!

I can confirm I only see in scotopic mode with low power 405nm and only when it's completely dark. The beam looks greyish and brighter than usual.

I don't think it's reasonable to use the scotopic curve for beam brightness comparison at all.
 
Re: Holy @#$%... $120 488nm diode!!

Count me in for two if there is a group buy :beer:
Assuming these diodes are 488 proven.
 
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