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Blue VS Green Laser Brightness

Joined
May 15, 2016
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So, according to the relative brightness calculator, a 532nm laser is 13.57x brighter then a 450nm laser of the same power. However, if I switch to beam brightness, and turn on mesopic correction, the blue laser's beam is actually 1.31x BRIGHTER then the green laser, when they are both 5mW. At 1W for both, the green laser is 1.17x brighter, and that increases with the power of both lasers. Is that even close to correct? A blue laser having a brighter or nearly as bright beam as a green laser with the exact same power just sounds so wrong...
 



gazer101

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Feb 23, 2020
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I think it has to do with rayleigh scattering being stronger at lower wavelengths but peak human eye sensitivity being stronger closer to 525nm (during the night)
 
Joined
May 15, 2016
Messages
113
Points
18
I think it has to do with rayleigh scattering being stronger at lower wavelengths but peak human eye sensitivity being stronger closer to 525nm (during the night)
I know that Rayleigh scattering makes blue beams brighter, but being pretty close to green just sounds wrong... I remember my laser 303 being almost as bright as my Gatling, though I never compared them side by side as the 303 died long before I even had the Gatling.
 

CurtisOliver

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Something else you are not accounting for in real world comparison is beam specs. Multimode 445’s have got wide rectangular beams. Often 5x2mm whereas a typical 532 can have a 2-3mm round Gaussian profile.
 
Joined
May 15, 2016
Messages
113
Points
18
Something else you are not accounting for in real world comparison is beam specs. Multimode 445’s have got wide rectangular beams. Often 5x2mm whereas a typical 532 can have a 2-3mm round Gaussian profile.
That makes sense. The 303's beam was about 1-2mm in diameter. The Gatling has 2x4.5mm beam. That should be about 3-4x the cross-sectional area.
 




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