Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

445nm vs 532nm brightness comparison.

Joined
Jan 7, 2007
Messages
368
Points
18
I realize a 532nm is going to be perceived as significantly brighter to a equal output 445nm laser. What I would like to know is the estimated guess in brightness from people who have personally compared their 445's to their 532's.

For example. Lets say somebody has a 1000mW 445nm, and they think it is about as bright as a 100mW green. That is all I would like to know.

Reason I ask is because I am going to be starting a 445 build here within the next week or so. I want to make one that outputs roughly 150mW. So based on the responses in this thread, I will be able to make a estimated ratio of which I could apply to the 150mW I want to build. This way I can get a idea of how bright it might actually be.

Appreciate it!
 





DJNY

0
Joined
Nov 2, 2009
Messages
5,991
Points
83
You need 3-4x the power of 445nm to get same brightness as with a 532nm.

Here is a shot 1000mW 449nm vs 200mW 532nm


The 449nm is a tick brighter.

 
  • Like
Reactions: Asa
Joined
Oct 11, 2007
Messages
106
Points
0
1.1 Watts of 445nm is about the same brightness to me as a 250-300mW Green at night.

During the day, it looks the same as a 150mW green.
 

Burnsy

0
Joined
Apr 20, 2010
Messages
241
Points
0
1.1 Watts of 445nm is about the same brightness to me as a 250-300mW Green at night.

During the day, it looks the same as a 150mW green.

That's because the eyes sensivity peak of light is during day at about 555nm but decreases in night to about 515nm (correct me if I'm wrong)
so closer to blue, seen on Wiki here (sorry it's german):

blue curve is at night, red during day

Vlambdaps.png
 
Joined
Jan 15, 2008
Messages
3,575
Points
0
1.1 Watts of 445nm is about the same brightness to me as a 250-300mW Green at night.

During the day, it looks the same as a 150mW green.
True. I saw the same thing.


Had my evo pro130 and my 900mW 445nm. And the blue dot was about the same at over fifty meters. in the full sunlight .
 
Joined
May 2, 2008
Messages
2,025
Points
63
Looks like they intersect right at 532nm ;) Making that the optimal wavelength for any conditions :eek:
 

Kenom

0
Joined
May 4, 2007
Messages
5,629
Points
63
DSC00302.JPG

DSC00304.JPG

DSC00305.JPG

DSC00306.JPG

DSC00307.JPG


This is a comparison of 600mw of 445nm and 400mw of 532nm.
 
Joined
Jan 7, 2007
Messages
368
Points
18
Awesome, thanks ken! That is actually pretty close in terms of brightness. That is good to hear. I am attempting to build a 50-75mW 445 in a pen, and I was hoping it would still be pretty bright. Based on this, a 75mW 445 may be equivalent to a 40-50mW green. And a 50mW would be similar to a 30mW green. Which is actually still quite bright!
 
Joined
Sep 16, 2007
Messages
3,658
Points
113
250mW of 445 is about as bright as 50mW of green. Low light. Just tested it.
Edit:
300mW of 655nm about as bright as 250mW 445.
 
Last edited:

.3lite

0
Joined
May 4, 2009
Messages
287
Points
18
250mW of 445 is about as bright as 50mW of green. Low light. Just tested it.

No, I find 445nm very dark, blue but dark, and I can't even imagine comparing to 532nm because it's just too dark.

visible_light_spectrum(1).png


I see this color (445nm) compared to 532nm exactly like on this graph, 532nm is way more brighter for me, like ten times or so.
 
Joined
Sep 16, 2007
Messages
3,658
Points
113
No, I find 445nm very dark, blue but dark, and I can't even imagine comparing to 532nm because it's just too dark.

I see this color (445nm) compared to 532nm exactly like on this graph, 532nm is way more brighter for me, like ten times or so.

Hmm...
I would actually say that 655nm and 445nm are almost the same brightness per milliWatt.
In direct sunlight, red is brighter.

Edit: I'm talking about the "spot," not the beam, since that is dependent on many more things.
And Traveller, that is a great photo. The color looks very realistic.
 
Last edited:

jbtm

0
Joined
Mar 22, 2010
Messages
495
Points
0
New Page 1

Shots of 600mA set 445nm diode compared to 200mW green. You can see the blue vs green on wall, hince why my room glows more blue than green.
 
Joined
Sep 16, 2007
Messages
3,658
Points
113
New Page 1

Shots of 600mA set 445nm diode compared to 200mW green. You can see the blue vs green on wall, hince why my room glows more blue than green.

It's hard to determine "brightness" in a photo.
For example, my camera makes 250mW of 445nm look brighter than 130mW of 532nm which is not the case in reality.

A 200mW green should be much brighter than a 445nm ~500mW.
 
Joined
Dec 21, 2008
Messages
1,223
Points
0
It's hard to determine "brightness" in a photo.
For example, my camera makes 250mW of 445nm look brighter than 130mW of 532nm which is not the case in reality.
That's interesting, particularly since almost all cameras favor green, just like the human eye. The Bayer filter pattern is either GRGB or RGGB... :-/

EDIT: look at my photo (above) and tell me which color is more striking to you...
 




Top