Old 08-05-2008, 08:08 AM #1
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Default Blueray visability

How visable is a 100+ mw br compared to a green at night?


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Old 08-05-2008, 08:10 AM #2
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Default Re: Blueray visability

Well, looking at the spectrum, green is the most visible. I do not actually own a BR, YET, however the wavelength spectrum shows 405nm as one of the lower visible ones. Thats not to say it isnt invisible, but just not AS visible, or not closely as visible as a green one.

If I am wrong, someone correct me.
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Old 08-05-2008, 08:20 AM #3
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Default Re: Blueray visability

The other thing about blu-rays, is that not all people see them the same. So it will be a little different for each person.

I just compared a 107mW blu-ray to a 5.8mW green in total darkness. For my eyes, they are pretty close. (beam visibility)

I did the comparison against a 12mW green, and the green beam was easily more visible...
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Old 08-05-2008, 08:24 AM #4
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Default Re: Blueray visability

ok thankyou
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Old 08-05-2008, 10:39 PM #5
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Default Re: Blueray visability

It really depends on the conditions. If there is even a little ambient lighting, a 5mW green will eclipse a blu-ray beam. Now if you are in a pitch black area then a 100mW blu-ray will be very visible, it's almost shocking how much a little difference in lighting can make on the blu-rays beam.
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Old 08-06-2008, 04:29 PM #6
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Default Re: Blueray visability

Also depends on what wavelength your bluray diode actually is running at. 409nm might look brighter than a <405nm diode.
Luck of the draw.
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Old 08-06-2008, 06:31 PM #7
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Default Re: Blueray visability

It will suck if you have transition-glasses.
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Old 08-07-2008, 07:36 PM #8
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Default Re: Blueray visability

Its the little bits of stuff dust,smog,fog that make the greens look brighter then the BR's but the BR's really make the air "glow" and the beam is more visible.

--hydro15

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Old 08-07-2008, 11:07 PM #9
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Default Re: Blueray visability

mW for mW the 405nm laser's dot is slightly less visible than a 660nm red laser. In other words, you can figure that on a non fluorescent surface, mW for mW, a 405nm laser will be about 5% as bright as a 532nm laser.
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Old 08-08-2008, 04:28 AM #10
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Default Re: Blueray visability

Quote:
Originally Posted by hydrogenman15
Its the little bits of stuff dust,smog,fog that make the greens look brighter then the BR's but the BR's really make the air "glow" and the beam is more visible.

--hydro15
Not true. green is more visible cause its a more visible waveleanth to the human eye; not because there is more junk in the air when you turn on a green laser. Also not true that a blurays beam is more visible, because they arent.

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Old 08-08-2008, 04:53 AM #11
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Default Re: Blueray visability

Quote:
Originally Posted by pwnstar
[quote author=hydrogenman15 link=1217920106/0#7 date=1218134162]Its the little bits of stuff dust,smog,fog that make the greens look brighter then the BR's but the BR's really make the air "glow" and the beam is more visible.

--hydro15
Not true. green is more visible cause its a more visible waveleanth to the human eye; not because there is more junk in the air when you turn on a green laser. Also not true that a blurays beam is more visible, because they arent.

[/quote]

Never mind power for power. Dot visibility to equal dot visibility, given equal beam diameters, the 405nm laser will have a more pronounced beam due to Raleigh scattering.
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Old 08-08-2008, 11:01 AM #12
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Default Re: Blueray visability

Quote:
Originally Posted by pwnstar
[quote author=hydrogenman15 link=1217920106/0#7 date=1218134162]Its the little bits of stuff dust,smog,fog that make the greens look brighter then the BR's but the BR's really make the air "glow" and the beam is more visible.

--hydro15
Not true. green is more visible cause its a more visible waveleanth to the human eye; not because there is more junk in the air when you turn on a green laser. Also not true that a blurays beam is more visible, because they arent.

[/quote] Thats true,but Blu-ray is more energetic. so its got a visible beam and a dimmer dot then green. Basically the light scattered off the dot won't drown out the BR's beam. I like blu-rays so much because of that.

--hydro15
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