Old 02-04-2015, 10:05 AM #1
Banned
 
Join Date: Jan 2015
Posts: 66
Rep Power: 0
iroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to all
iroquois iroquois is offline
Banned
 
Join Date: Jan 2015
Posts: 66
Rep Power: 0
iroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to all
Default perceived brightness for given wavelength?

I remember seeing a chart somewhere, though I may be mistaking it for something else.

I know beam diameter and divergence affects this a lot too.

Anyway, same power blue laser (445nm) appears less bright to the human eye than red and green wavelengths.
Is there anyway to find out how bright each wavelength appears to the human eye, or how their brightness compares?

Say you want to compare 445nm, 638nm and 520nm.


iroquois is offline   Reply With Quote


















Old 02-04-2015, 10:32 AM #2
BowtieGuy's Avatar
Class 4 Laser
 
Join Date: Oct 2012
Location: S.E. Michigan U.S.A.
Posts: 5,116
Rep Power: 21474862
BowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond repute
BowtieGuy BowtieGuy is online now
Class 4 Laser
BowtieGuy's Avatar
 
Join Date: Oct 2012
Location: S.E. Michigan U.S.A.
Posts: 5,116
Rep Power: 21474862
BowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond repute
Default Re: perceived brightness for given wavelength?

You were probably thinking of this:

http://http://users16.jabry.com/lsrtools/RelativeBrightness/

Although, it's not up and running right now.

Edit: Teej, and Pi have a working version posted!
__________________
405nm Solarstorm S3 (1.09W) • W/L Sonar (264mW)
405nm Custom JETLASERS Ti-B (1.08W)

445nm Build "Ole Blue" (2.8W+)
445nm 1.3W JETLASERS PL-E (1.5W)

450nm Custom JETLASERS Ti-B (327mW)
462nm Solarforce T2 (2.1W)-link-
465nm 1.4mW JETLASERS Mini (1.64W)
467nm "Maraxus" (2.3W)
470nm "Silver Bullet" (6.12W)
488nm Custom S.S. Solarstorm (138mW)
493nm Custom JETLASERS Ti-B (148mW)-link-
503nm Custom (101mW)
515nm 30mW Ehgemus titanium (84mW)
520nm S/S build (250mW) •50mW JETLASERS Ti-B (73mW)
520nm Ehgemus Custom (1.45W) •Coleman Jr. (234mW)

532nm 1.5W Goldenstar lab (3W)
532nm 500mW JETLASERS PL-E (754mW)
532nm 100mW JETLASERS Ti-B (161mW)
532nm 5mW "Eclipse" mints tin (54mW)

589nm 80mW CNI PGL-III-C (154mW)
589nm 50mW D/L Spartan (124mW)

594nm L/G Rigel-6 "LPF Anniv. Ed." (6.7mW)
635nm 20mW JETLASERS Ti (30mW)
638nm Custom JETLASERS Ti-B (232mW)
638nm "Coleman Special" (260mW)
638nm Sinner's "MS-SSW Stubby" (1.25W)
650nm W/L E2 (89mW) • Laserbtb PL-650 1000 (1W)
660nm S/S Build (383mW)
674nm 501B/Melles Griot u/k Build 20mW

LK-3D Projector

5W Ophir/dmm LPM, nospin 5W LPM

Last edited by BowtieGuy; 02-04-2015 at 12:08 PM.
BowtieGuy is online now   Reply With Quote
Old 02-04-2015, 10:36 AM #3
Pi R Squared's Avatar
Class 3B Laser
 
Join Date: May 2013
Location: Snohomish County Washington, US
Posts: 3,798
Rep Power: 3254476
Pi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond repute
Pi R Squared Pi R Squared is offline
Class 3B Laser
Pi R Squared's Avatar
 
Join Date: May 2013
Location: Snohomish County Washington, US
Posts: 3,798
Rep Power: 3254476
Pi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond reputePi R Squared has a reputation beyond repute
Default Re: perceived brightness for given wavelength?

Quote:
Originally Posted by iroquois View Post
I remember seeing a chart somewhere, though I may be mistaking it for something else.

I know beam diameter and divergence affects this a lot too.

Anyway, same power blue laser (445nm) appears less bright to the human eye than red and green wavelengths.
Is there anyway to find out how bright each wavelength appears to the human eye, or how their brightness compares?

Say you want to compare 445nm, 638nm and 520nm.
Yes there is such a chart somewhere, at least 2 different ones, can't remember where just now. Someone should come along and post that info here shortly.

No blue isn't less bright than red for the same power level. They are about the same. The peak brightness is somewhere about 550nm, I don't remember exactly, green lasers are the brightest.

So if you compare 445nm and 638nm they are very close in brightness, but a 520nm is very much brighter. Even my 82mw 520nm has a visible beam.

Alan

Edit: found them.

This one is good.
http://lsrtools.1apps.com/relativebrightness/

And here is something but not so detailed.

__________________
Keychain 650nm <5mW
Quartet 4-in-1 630-680nm <1mW

AtlasNova 635nm <5mW
MillionAccessories 532nm <5mW broken
M462 462nm one of a kind (in progress)
PLTB450B 450nm 1913mW G2 lens
PL520 520nm 82mW acrylic lens
S06J 12X 405nm 590mW G2 lens
C6 M140 445nm 1.5W 3 element lens
9mm 445nm with G2 lens in a stainless steel host
Radiant Electronics X4 3.7W Laser Power Meter


Everyone please post here: Countries of LPF. Where are you? <link>
___________________________________________
The light that shines twice as bright burns half as long.

Last edited by Pi R Squared; 02-04-2015 at 10:50 AM.
Pi R Squared is offline   Reply With Quote
Old 02-04-2015, 11:40 AM #4
Class 3R Laser
 
Join Date: Apr 2014
Location: NJ
Posts: 1,296
Rep Power: 784
Teej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond repute
Teej Teej is offline
Class 3R Laser
 
Join Date: Apr 2014
Location: NJ
Posts: 1,296
Rep Power: 784
Teej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond repute
Talking Re: perceived brightness for given wavelength?

Try this:

Beam: (580nm 1mw) vs. (595nm 1mw)




You just plug in the wavelength and power, etc....and you get a comparison.

Last edited by Teej; 02-04-2015 at 11:41 AM.
Teej is offline   Reply With Quote
Old 02-04-2015, 12:06 PM #5
BowtieGuy's Avatar
Class 4 Laser
 
Join Date: Oct 2012
Location: S.E. Michigan U.S.A.
Posts: 5,116
Rep Power: 21474862
BowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond repute
BowtieGuy BowtieGuy is online now
Class 4 Laser
BowtieGuy's Avatar
 
Join Date: Oct 2012
Location: S.E. Michigan U.S.A.
Posts: 5,116
Rep Power: 21474862
BowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond repute
Default Re: perceived brightness for given wavelength?

Teej, Pi, thanks, it's nice to see a version of that calculator tool that is working. The one I had been using hasn't been up for a while.
I find it pretty handy to have around for general comparisons, although some have said it's not always accurate.
__________________
405nm Solarstorm S3 (1.09W) • W/L Sonar (264mW)
405nm Custom JETLASERS Ti-B (1.08W)

445nm Build "Ole Blue" (2.8W+)
445nm 1.3W JETLASERS PL-E (1.5W)

450nm Custom JETLASERS Ti-B (327mW)
462nm Solarforce T2 (2.1W)-link-
465nm 1.4mW JETLASERS Mini (1.64W)
467nm "Maraxus" (2.3W)
470nm "Silver Bullet" (6.12W)
488nm Custom S.S. Solarstorm (138mW)
493nm Custom JETLASERS Ti-B (148mW)-link-
503nm Custom (101mW)
515nm 30mW Ehgemus titanium (84mW)
520nm S/S build (250mW) •50mW JETLASERS Ti-B (73mW)
520nm Ehgemus Custom (1.45W) •Coleman Jr. (234mW)

532nm 1.5W Goldenstar lab (3W)
532nm 500mW JETLASERS PL-E (754mW)
532nm 100mW JETLASERS Ti-B (161mW)
532nm 5mW "Eclipse" mints tin (54mW)

589nm 80mW CNI PGL-III-C (154mW)
589nm 50mW D/L Spartan (124mW)

594nm L/G Rigel-6 "LPF Anniv. Ed." (6.7mW)
635nm 20mW JETLASERS Ti (30mW)
638nm Custom JETLASERS Ti-B (232mW)
638nm "Coleman Special" (260mW)
638nm Sinner's "MS-SSW Stubby" (1.25W)
650nm W/L E2 (89mW) • Laserbtb PL-650 1000 (1W)
660nm S/S Build (383mW)
674nm 501B/Melles Griot u/k Build 20mW

LK-3D Projector

5W Ophir/dmm LPM, nospin 5W LPM
BowtieGuy is online now   Reply With Quote
Old 02-04-2015, 12:20 PM #6
Banned
 
Join Date: Jan 2015
Posts: 66
Rep Power: 0
iroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to all
iroquois iroquois is offline
Banned
 
Join Date: Jan 2015
Posts: 66
Rep Power: 0
iroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to alliroquois is a name known to all
Default Re: perceived brightness for given wavelength?

Thanks guys.
The only problem I see with the online tools it seems to work fine comparing different wavelengths of same power, but comparing different power of the same wavelength doesn't seem right. 10mW compared to 100mW or 100mW compared to 1000mW of anything says 10x more bright.
I remember someone saying brightness doesn't increase linearly or the same amount as the power increases, more like something like twice as bright if 3 times more power, or something.
Although I might not be remembering it right and these values are about how far the visible beam will travel before fading.

Last edited by iroquois; 02-04-2015 at 12:24 PM.
iroquois is offline   Reply With Quote
Old 02-04-2015, 12:30 PM #7
BowtieGuy's Avatar
Class 4 Laser
 
Join Date: Oct 2012
Location: S.E. Michigan U.S.A.
Posts: 5,116
Rep Power: 21474862
BowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond repute
BowtieGuy BowtieGuy is online now
Class 4 Laser
BowtieGuy's Avatar
 
Join Date: Oct 2012
Location: S.E. Michigan U.S.A.
Posts: 5,116
Rep Power: 21474862
BowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond reputeBowtieGuy has a reputation beyond repute
Default Re: perceived brightness for given wavelength?

Quote:
Originally Posted by iroquois View Post
I remember someone saying brightness doesn't increase linearly or the same amount as the power increases, more like something like twice as bright if 3 times more power, or something.
Yes, I've heard similar values also; many times, I've heard that 4 times power is needed for twice the perceived brightness.
__________________
405nm Solarstorm S3 (1.09W) • W/L Sonar (264mW)
405nm Custom JETLASERS Ti-B (1.08W)

445nm Build "Ole Blue" (2.8W+)
445nm 1.3W JETLASERS PL-E (1.5W)

450nm Custom JETLASERS Ti-B (327mW)
462nm Solarforce T2 (2.1W)-link-
465nm 1.4mW JETLASERS Mini (1.64W)
467nm "Maraxus" (2.3W)
470nm "Silver Bullet" (6.12W)
488nm Custom S.S. Solarstorm (138mW)
493nm Custom JETLASERS Ti-B (148mW)-link-
503nm Custom (101mW)
515nm 30mW Ehgemus titanium (84mW)
520nm S/S build (250mW) •50mW JETLASERS Ti-B (73mW)
520nm Ehgemus Custom (1.45W) •Coleman Jr. (234mW)

532nm 1.5W Goldenstar lab (3W)
532nm 500mW JETLASERS PL-E (754mW)
532nm 100mW JETLASERS Ti-B (161mW)
532nm 5mW "Eclipse" mints tin (54mW)

589nm 80mW CNI PGL-III-C (154mW)
589nm 50mW D/L Spartan (124mW)

594nm L/G Rigel-6 "LPF Anniv. Ed." (6.7mW)
635nm 20mW JETLASERS Ti (30mW)
638nm Custom JETLASERS Ti-B (232mW)
638nm "Coleman Special" (260mW)
638nm Sinner's "MS-SSW Stubby" (1.25W)
650nm W/L E2 (89mW) • Laserbtb PL-650 1000 (1W)
660nm S/S Build (383mW)
674nm 501B/Melles Griot u/k Build 20mW

LK-3D Projector

5W Ophir/dmm LPM, nospin 5W LPM
BowtieGuy is online now   Reply With Quote
Old 02-04-2015, 02:48 PM #8
Class 3R Laser
 
Join Date: Apr 2014
Location: NJ
Posts: 1,296
Rep Power: 784
Teej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond repute
Teej Teej is offline
Class 3R Laser
 
Join Date: Apr 2014
Location: NJ
Posts: 1,296
Rep Power: 784
Teej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond reputeTeej has a reputation beyond repute
Talking Re: perceived brightness for given wavelength?

Its along the lines of the inverse square law...but, for watts, if you think about it along the lines of lux vs lumens for example, for a given source with all else being equal, twice the lumens will give twice the lux.

Lux is how bright it looks, and lumens would be the total output.

Does that help?


The 4x as bright to look 2x as bright is more along the lines of distance relationships, and is according to the inverse square law.


Example:

I have a flashlight that puts out 1,000 lumens at 100,000 cd (Lux at 1 meter equivalent).

That means at 100 meters, it will put 10 lux on my target.

If I made that 2,000 lumens with the same beam pattern, I would now have twice that, at 20 lux (Double the lumens per square meter).

If I kept the 1,000 lumens and 100,000 cd, but moved the target to 200 meters, I would drop to only 2.5 lux.

So at double the DISTANCE, the same light is going to make the target appear 1/4 as bright.


And, conversely, the light would need to be 4x brighter to make the target look the same brightness, at double the distance.


Last edited by Teej; 02-04-2015 at 03:00 PM.
Teej is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


LinkBacks (?)
LinkBack to this Thread: https://laserpointerforums.com/f44/perceived-brightness-given-wavelength-92688.html
Posted By For Type Date
SCCY Forum ? View topic - Laser Questions This thread Refback 06-01-2015 05:00 AM


























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 03:56 PM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC