Old 09-14-2007, 07:57 AM #1
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Default 555nm for day / ???nm for night

I've seen posts on how the human eye shifts its sensitivity to the blue end of the color spectrum at night. While 555nm is the "holy grail" wavelength, many of us use lasers at night for better visibility.

Anyone know the exact wavelength that the eye acquires best when dark adapted or have a link to a chart?

Thanks, Kwiz



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Old 09-14-2007, 12:04 PM #2
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Default Re: 555nm for day / ???nm for night

Photopic vision (or daylight vision) has a peak frequency response of 555nm. Scotopic vision however, (night or dark adapted vision) Shifts its frequency further into the blue region of the spectrum and peaks at 507nm.

Here is a little graph to explain.

Jase.

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Old 09-14-2007, 07:29 PM #3
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Default Re: 555nm for day / ???nm for night

Ah. That's what I was looking for.

thanks.

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Old 09-15-2007, 05:45 AM #4
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Default Re: 555nm for day / ???nm for night

** Wishes he had a variable frequency laser... : **

--DDL
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Old 09-15-2007, 04:09 PM #5
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Default Re: 555nm for day / ???nm for night

Quote:
Originally Posted by Daedal
** Wishes he had a variable frequency laser... : **

--DDL
Methinks you misunderstand. Photopic and Scotopic sensitivity occur under ambient lighting. If you were to compare two lasers with the same power output, but of 555 and 507 nm the green laser would appear the brighter of the two even at night
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