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Old 11-07-2010, 11:25 AM #1
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Default 593nm vs 473nm visibility

Hi!

I'm buying a 50mw 593.5nm and I would like to know how the visibility of the beam at dark conditions will compare to a >100mw 473nm. I love my 473nm beam and I hope the 593nm will have at least the same beam visibility.

Thanks


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Old 11-07-2010, 04:04 PM #2
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Default Re: 593nm vs 473nm visibility

Around 565nm wave length is the most visible to eye.

So the yellow should be more visible than blue. but considering the 50mw and 100mw they should be the same
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Old 11-07-2010, 04:15 PM #3
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Default Re: 593nm vs 473nm visibility

I think that the orange laser should be just as visible as the blue one.
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Old 11-07-2010, 05:15 PM #4
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Default Re: 593nm vs 473nm visibility

In THEORY according to the CIE tables...

The blue would be 7 lumens, and the amber would be 25 lumens. According to the root of the ratio, the amber DOT would be almost twice as bright assuming the sizes were the same. But since blue is more affected by Raleigh Scattering, the blue BEAM might appear brighter.
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Old 11-08-2010, 01:25 AM #5
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Default Re: 593nm vs 473nm visibility

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Originally Posted by Cyparagon View Post
In THEORY according to the CIE tables...

The blue would be 7 lumens, and the amber would be 25 lumens. According to the root of the ratio, the amber DOT would be almost twice as bright assuming the sizes were the same. But since blue is more affected by Raleigh Scattering, the blue BEAM might appear brighter.
This.

My old 5mw 594nm laser's dot was roughly the same as my 17 mw 473nm blue laser's dot. However, if the air was clear, my 594's beam would be practically invisible no matter the lighting. However, the 473's beam is fairly well visible in even dim lighting, and is strikingly visible in total darkness. I've found a 473's BEAM to be about as bright as the BEAM of a 532nm green whose DOT is twice as bright as the 473's DOT.
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Old 11-08-2010, 02:18 PM #6
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Default Re: 593nm vs 473nm visibility

555nm is the peak sensitivity of the eye.
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Old 11-08-2010, 02:21 PM #7
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Default Re: 593nm vs 473nm visibility

Quote:
Originally Posted by reginak View Post
Hi!

I'm buying a 50mw 593.5nm and I would like to know how the visibility of the beam at dark conditions will compare to a >100mw 473nm. I love my 473nm beam and I hope the 593nm will have at least the same beam visibility.

Thanks
Relative Visibility of Light at Various Wavelengths
Link Sam's Laser FAQ - Items of Interest
473 nm .104 Blue Blue frequency doubled Nd:YAG
555 nm 1.000 Yellow-Green Reference (peak) wavelength
594.1 nm .706 Orange-yellow Yellow HeNe laser

I've color code the text so you can detect a difference in apparent brightness.
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Old 11-30-2010, 08:01 AM #8
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Default Re: 593nm vs 473nm visibility

I wonder how many people will say that 555nm is the peak sensitivity to the Eye. Lol

555nm is also the peak for your cones, 515nm is best for your rods. Just measure the + or - from 555 or 515. Its a bell curve (Or close to one) So you should be good. Whatever one is closer, you SHOULD be able to see better.

I THINK that lower wavelengths are a little more visible because of Scattering, but I am not sure. Dont quote me on this
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Old 11-30-2010, 07:30 PM #9
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Default Re: 593nm vs 473nm visibility

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555nm is also the peak for your cones, 515nm is best for your rods.
Close, but not quite. 555 is the peak for photopic vision, and ~498 is the peak for scotopic vision. Mesopic vision has a peak somewhere in between depending on light level.
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Old 11-30-2010, 09:58 PM #10
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Default Re: 593nm vs 473nm visibility

Wikipedia. Psh lol damn I cant remember where I heard 515nm.. Other sources says 507.
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Old 12-01-2010, 02:26 AM #11
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Default Re: 593nm vs 473nm visibility

@Quadcam That would be because that 473 is a lower wavelength which has more energy per unit. This causes the beam to have more energy, while the dot still has the SAME amount of energy.
@Steve001 Color coding will not help as the LCD compensates for the change in apparent brightness. Nice try though
@reginak the 473 will be brightest overall.
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Old 12-01-2010, 03:17 AM #12
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Default Re: 593nm vs 473nm visibility

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Originally Posted by Tikilaser View Post
@Quadcam That would be because that 473 is a lower wavelength which has more energy per unit. This causes the beam to have more energy, while the dot still has the SAME amount of energy.
@Steve001 Color coding will not help as the LCD compensates for the change in apparent brightness. Nice try though
@reginak the 473 will be brightest overall.
Though the monitor may average brightness apparent brightness is what the brain does when it perceives different colors. There's no actual difference if all things are equal.

All things being equal. If you were to compare these two wavelenghts of light under dark conditions projected upon a surface the green light of 555nm would appear brighter. But looking at the two wavelengths side by side [ the beam] blue would be the most noticeable as long as your eyes have had time to become dark adapted.
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Old 12-01-2010, 03:25 AM #13
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Default Re: 593nm vs 473nm visibility

As one would think from quadcam's remarks, the dark adapted eye has it's sensitivity peak shift towards blue, and air scatters more in shorter wl's so, the blue is more easily seen per mW in sighting the beam in the dark. -GH
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Old 12-01-2010, 10:46 AM #14
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Default Re: 593nm vs 473nm visibility

@steve001 The colors have no difference....the apparent brightness is accounted fpr and so they all appear the same although more energy is in the pixels for the orange and blue to compensate.
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Old 12-01-2010, 12:24 PM #15
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Default Re: 593nm vs 473nm visibility

I got the 45mW 594.5nm laser and the beam from the 100mW 473nm is MUCH more visible.

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Old 12-01-2010, 01:53 PM #16
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Default Re: 593nm vs 473nm visibility

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@steve001 The colors have no difference....the apparent brightness is accounted fpr and so they all appear the same although more energy is in the pixels for the orange and blue to compensate.
Apparent brightness means a subjective interpretation performed by your brain based upon the eyes response to various wavelengths of light under normally lit viewing condition. That's what the table listed on SAMS LASER FAQ shows. Under dark conditions with only natural ambient light that peak then shifts to the blue. However, if you where to introduce light that is photopically closer to the peak and of the same luminosity as the ambient light then that introduced light would appear brighter.

As I'm writing this on my monitor there appears this in the upper right: Logged in as steve001. A portion of that text is in white. My screen name is in green. Both are balanced to have the same luminosity, but to my eye the my screen name appears to be apparently brighter.
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