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Old 12-14-2012, 05:09 PM #1
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Default howmuch mW for equal brightness?

hi
i wanted to ask howmuch mW of blue 445nm i need to equal the brightness of a 300 mW green 532 nm
to have them like same brightness
thanks


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Old 12-14-2012, 05:14 PM #2
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Default Re: howmuch mW for equal brightness?

Try this calculator for a guideline. You need about 4.3W 445nm to match in brightness.

Beam: (532nm 300mw) vs. (445nm 4299.53mw)
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Old 12-14-2012, 06:13 PM #3
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Default Re: howmuch mW for equal brightness?

damn...
thx
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Old 12-14-2012, 06:32 PM #4
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Default Re: howmuch mW for equal brightness?

Quote:
Originally Posted by Blord View Post
Try this calculator for a guideline. You need about 4.3W 445nm to match in brightness.

Beam: (532nm 300mw) vs. (445nm 4299.53mw)
From experience I can tell you that 4.4W of 445nm is MANY times brighter than my 300mW 532nm laser.
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Old 12-14-2012, 06:42 PM #5
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Default Re: howmuch mW for equal brightness?

I have to say that my 2.7W 445nm overpowers my 300mW 532nm by a reasonable amount. Some peoples sensitivity to certain wavelengths are different than others. That calculator is WAY off for other wavelengths for me as well. Just like how my 650nm 315mW laser appears roughly 3x as bright as my 630mW 405nm while the calculator thinks I would need over 7.5W of 405nm to be equal. I know that I see 405nm quite well compared to some people so everyone is different.
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Old 12-14-2012, 06:49 PM #6
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Default Re: howmuch mW for equal brightness?

I think the human eyes is already saturated by the amount of light from the dot. You will need some kind of a lux meter to measure the brightness.
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Old 12-14-2012, 06:53 PM #7
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Default Re: howmuch mW for equal brightness?

But here is the thing. He is looking for perceived brightness comparison.
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Some of the collection:
-405nm -811mW - S06J@490mA - Aurora C6
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-650nm -324mW - 3.8mm OpenCan@428mA - C6
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Old 12-14-2012, 07:04 PM #8
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Default Re: howmuch mW for equal brightness?

Quote:
Originally Posted by ApexProxy View Post
But here is the thing. He is looking for perceived brightness comparison.
Well that is the question. Everyone is perceiving colors differently. The brightness is different for everyone.
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638nm 175mW Ehgemus, 1W Rook
660nm 1216mW Skylaser PL660, 263mW LPC826 C6
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780nm 150mW Dilda
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Old 12-14-2012, 08:34 PM #9
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Default Re: howmuch mW for equal brightness?

It'll depend on your lighting conditions too. If your eyes are dark-adjusted, the blue will look brighter than if your eyes are light-adjusted.

Anyway, you can look at the tables here and see. The "lm/W" is the amount of perceived brightness to the amount of power. So you can equalize the ratios to see how many Watts you need of one to match the other.
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Old 12-15-2012, 04:53 AM #10
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Default Re: howmuch mW for equal brightness?

yes i meant perceived brightness of the two colors
want to know howmuch mW i need so that the green doesn't outshine the blue
keep the beams in balance as much as possible
brightness is different to everyone but not by much i hope?
would 1mW of blue be enough?

edit: i have no idea whats on that page of tables

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Old 12-15-2012, 12:44 PM #11
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Default Re: howmuch mW for equal brightness?

you pretty much wouldn't see 1mW of 445nm at all. Green is one of the best visible wavelengths around so for any other wavelength to be equal to it you will need more power.

Perceived brightnesses of colors does vary person to person pretty drastically. So it really is hard to say. I would think a 1.5W 445nm would balance ok with 300mW of 532nm but that is based on my perception only.
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Some of the collection:
-405nm -811mW - S06J@490mA - Aurora C6
-445nm -3.04W - 9mm@2.2A - Ultrafire L2
-445nm -2.95W - M140@2A - "Hyperion" Black Ice/Flash Freeze hybrid
-445nm -2.2W - M140@1.8A - Aurora C6
-445nm -1.93W - M140@1.8A - Blue Ice by yobresal
-450nm -1.67W - PLTB450@1.7A - Survival Laser S4
-488nm ~25mW - "The Beast" JDSU Argon Ion
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-532nm -374mW - Skylaser HL532 300mW
-532nm -90mW - SD-303
-532nm -110mW - 50mW FastTech Module - DTR Skyray
-543nm ~.3mW Melles Griot HeNe
-638nm -1.3W - ML501P73@1.5A - Survival Laser S4
-638nm -1W - ML501P73@1.4A - Ultrafire WF-602C
-650nm -324mW - 3.8mm OpenCan@428mA - C6
-650nm -128mW - 3.8mm OpenCan@200mA - C6 (Mohgasm JAD)
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Old 12-17-2012, 03:44 AM #12
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Default Re: howmuch mW for equal brightness?

found my answer
as suspected the green will be brighter but according to this video i think its pretty OK
SKYLaser 1000mW/1W Blue Handheld Laser! - REVIEW & BURNING - YouTube

at about 1:05 he compares the 300mW green against the 1W blue
god, this review is so 100% perfect
he shows exactly the two lasers that i want to buy so badly and he compares them
how luckier can i get lol
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Old 12-17-2012, 05:26 AM #13
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Default Re: howmuch mW for equal brightness?

looking at diff, wavelengths one at a time is way different than more than one.

If you get a chance to use a DPSS 532 in the presence of an argon SL or ML you will be surprized to see your green laser turn to almost yellow- wierd!!

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Old 12-17-2012, 07:12 PM #14
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Default Re: howmuch mW for equal brightness?

70mw green and 350mw blue look about the same to me.
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Old 12-17-2012, 07:25 PM #15
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Default Re: howmuch mW for equal brightness?

My 1.2W 445nm is the same brightness to me as my 400mW 532nm when it is warmed up and batteries are fully charged.
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Old 12-29-2012, 09:30 PM #16
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Default Re: howmuch mW for equal brightness?

Too many variables at play here. You will probably never get an objective response to your question.
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