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01-19-2018, 11:04 PM #1
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ldrago125
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math equasion converting the brightness of green laser to blue

if a green laser was 50mW, how many mW would a blue one have to be to have the same brightness.

I would guess 50mW green = 75mW blue..

thanks

01-19-2018, 11:09 PM #2
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Hap
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Re: math equasion converting the brightness of green laser to blue

Relative Laser Beam Brightness Calculator: (409nm 1mw) vs. (527nm 1mw)

-Alex
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01-19-2018, 11:50 PM #3
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diachi
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Re: math equasion converting the brightness of green laser to blue

Quote:
 Originally Posted by ldrago125 if a green laser was 50mW, how many mW would a blue one have to be to have the same brightness. I would guess 50mW green = 75mW blue.. thanks

You need to be more specific than just "blue" or "green" too, there are a whole range of wavelengths that can be considered blue and green.
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01-20-2018, 12:12 AM #4
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hakzaw1
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Re: math equasion converting the brightness of green laser to blue

Quote:
 Originally Posted by diachi You need to be more specific than just "blue" or "green" too, there are a whole range of wavelengths that can be considered blue and green.
Member 'Astrail' has an awesome one in his sig- best I have ever seen. And while you are there dwnld his divergence tool.. again its the best one out there.

As Diachi noted just blue or red wont work at all.

EXAMPLE... one might assume that 660-650 red looks as bright as 635, 638 or 640 BUT you would be wrong-- 1000mW of the best thin beam 640 is as bright to our eyes as 3 or 4000mW of 660 red.
Its a fairly common mistake to buy hi power green only to find you must spend a LOT to get a good white in the end.... best to match the green's power to your existing R &/or B.

100mW of 520 of 532 green laser is a LOT of brightness ...punch in the numbers-- 100mW 520 takes like 5000mW of 405 violet. Also 'white' does not look the same to everyone. Black laser on the other hand is safe and cheap, not requiring eyeware. jk
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Last edited by hakzaw1; 01-20-2018 at 12:19 AM.

01-20-2018, 12:13 AM #5
 Class 4 Laser Join Date: Sep 2007 Location: Wisconsin Posts: 9,315 Rep Power: 385035
Cyparagon
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Re: math equasion converting the brightness of green laser to blue

There are also several distinct ways to measure the colloquial "brightness." Do you want power, luminous flux, luminous energy, illuminance, power density, or luminous efficacy?
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01-20-2018, 12:28 AM #6
 Class 4 Laser Join Date: Apr 2009 Location: 'Deep in the Heart Of Texas..." Posts: 8,666 Rep Power: 1094905
hakzaw1
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Re: math equasion converting the brightness of green laser to blue

Quote:
 Originally Posted by Cyparagon There are also several distinct ways to measure the colloquial "brightness." Do you want power, luminous flux, luminous energy, illuminance, power density, or luminous efficacy?

^^^ great point!!! +rep when sys allows.
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IF YOU ARE NEW HERE- READ ALL THIS http://laserpointerforums.com/f37/an...ml#post1353314
& Spend some hours reading at LASERPOINTERSAFETY.COM

QS/FB3 +Beyond-APC40-Mamba Black(clone) 5paghettix2 and I-show x2-Kasio synth-midi
KGB- 532 1.1W 445 2.2W 655 1.3W DT Pro 40 still needs more red.
KGB1W+ 532 DT Pro 40 soon to be GB.
Laserking 1300RGB FULL COLOR 30K(may be FS)
Laserking RGB LK PD2 500 and LK SD 850
REKE RGB 500- G 300
HeNes-(12)R(3)G-COH-594/5 mW-thnx DrSam
MULTILINE-147mW[
445nm 180mW-Mini spiro-Yob.
Spacelas 1178mW 655nm/AixiZ 300mW532&
2 B&W 473nm 5/6mW lab
JETLRS1.3W&1.2W-MGL-H
638 180mW ttl mimi lab (av. 230mW)
405 100mW ttl mini lab
445 300 mW ttl mni lab ^AixiZ^ all for a lumia PJ
*MightyMite 2000* RGB all diode 2.2W 30K- 637/520./450...NEW!!
Guide DIY Pjs by Dan-
http://nqlasers.com/scannerreference/index.php?title=Main_Page

01-20-2018, 05:58 PM #7
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Encap
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Re: math equasion converting the brightness of green laser to blue

Quote:
 Originally Posted by Cyparagon There are also several distinct ways to measure the colloquial "brightness." Do you want power, luminous flux, luminous energy, illuminance, power density, or luminous efficacy?
Exactly--it helps if you have at least a slight clue concerning what you are talking or asking about

idrago125 --- Keep in mind, visual perception are varies. No two people see exactly the same. Color is not a physical property; it is merely the brain’s interpretation of different wavelengths of light. Brightness is a similar situation---not a physical property.

Last edited by Encap; 01-21-2018 at 01:08 PM.

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