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Posted: 4/6/2002 11:03:44 PM EDT
at this site! [url]http://store.yahoo.com/deharpport/greenlasgung.html[/url] it shows a green laser for a AR-15/m-16. anyone know of one where i can get one cheaper than $500.00??
Link Posted: 4/6/2002 11:21:07 PM EDT
[Last Edit: 4/6/2002 11:31:04 PM EDT by Guncrazy223]
Funny thing is the first time I say a green laser it was on a paintball site and was less than $150. Once I read up on green lasers I couldn't find the site again and then the green lasers went to the insane prices you see today. Just start searching using a good search engine and you could probably find some other places selling these. The other funny thing is they will now sell 5mW green laser pointer for $250 but he laser sight is $500 using the exact same laser diode. Supposedly the Green diode is what is supposed to cost so much. HA. Green lasers are rare and so they charge a very high premium.
Link Posted: 4/6/2002 11:54:06 PM EDT
This is what I have been told: Green laser might not be the best color to use. You want something that will be completely different in color than what you will encounter. Woodland camo has alot of green. Secondly, the majority of the receptors in normal human eyes are sensitive to red so a green laser may appear dimmer although it would have the same output rating.
Link Posted: 4/7/2002 12:08:21 AM EDT
Anyone tried green w nightvision gear?
Link Posted: 4/7/2002 6:42:38 AM EDT
Link Posted: 4/7/2002 7:33:57 AM EDT
My only day visible Laser is 520nm and green. Not cheap but a good laser. Non-aerobatic-airplane, I paid $400.00 for mine but that was through an ArmaLite dealer about a year ago. At that time, ArmaLite carried the GreenBeam but I don't know about now.
Link Posted: 4/7/2002 10:05:07 AM EDT
Originally Posted By 5subslr5: My only day visible Laser is 520nm and green. Not cheap but a good laser. Non-aerobatic-airplane, I paid $400.00 for mine but that was through an ArmaLite dealer about a year ago. At that time, ArmaLite carried the GreenBeam but I don't know about now.
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if it will go on my bushy 20' i would pay ya $275.00 for it. if it still works.
Link Posted: 4/7/2002 2:16:19 PM EDT
Originally Posted By MRW: Incorrect IMBRO.
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Like I said, I was told to post that. I will tell them they are wrong.
Link Posted: 4/7/2002 2:51:12 PM EDT
Commies use green, china uses white... wait, that's tracers! We had these cool IR lasers in the gulf, that you had to use nods to see. They were pretty neat, but big for a laser.
Link Posted: 4/7/2002 2:53:34 PM EDT
Citabria7GCBC, check that site again. It's now on sale for $449. Still seems pretty high compared to a red laser. coyote3
Link Posted: 4/7/2002 3:31:47 PM EDT
Link Posted: 4/7/2002 3:35:26 PM EDT
Originally Posted By Citabria7GCBC:
Originally Posted By 5subslr5: My only day visible Laser is 520nm and green. Not cheap but a good laser. Non-aerobatic-airplane, I paid $400.00 for mine but that was through an ArmaLite dealer about a year ago. At that time, ArmaLite carried the GreenBeam but I don't know about now.
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if it will go on my bushy 20' i would pay ya $275.00 for it. if it still works.
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For some odd reason these lasers will not work with Bushy's. I believe ArmaLite installed some sort of B/M detector but for an extra $225.00 I can have it removed !
Link Posted: 4/7/2002 3:53:02 PM EDT
Originally Posted By coyote3: Citabria7GCBC, check that site again. It's now on sale for $449. Still seems pretty high compared to a red laser. coyote3
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i am sure after Taxes and shipping, it will be closer to $500.00
Link Posted: 4/7/2002 3:57:30 PM EDT
Originally Posted By Citabria7GCBC:
Originally Posted By coyote3: Citabria7GCBC, check that site again. It's now on sale for $449. Still seems pretty high compared to a red laser. coyote3
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i am sure after Taxes and shipping, it will be closer to $500.00
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Don't believe you'll get whacked for sales tax -just shipping.
Link Posted: 4/7/2002 4:49:46 PM EDT
Hello, Your eye does peak in response to yellow/green 555nm during the day and 510nm at night or the peaks. The statement "Red lasers are good because it allows for the highest intensity of the beam with the lest ammount of energy. In other words, you get the brightest dot with the least damage to your eyes. For the same brightness, a green laser would carry much more energy and present a greater hazzard." is not correct though, see http://www.intl-light.com/handbook/ch02.html If you had a 5mW red laser (635nm) and a 5mW green laser(532nm) the green laser would look 3.8 times brighter. Yes the green laser has more energy by Q = hc / l but you could then use a much lower power laser and have it appear just as bright. You can also see http://www.optics.arizona.edu/Palmer/rpfaq/rpfaq.htm#eye for info. Also www.thorlabs for laser diodes if you want to build something. Robert
Link Posted: 4/7/2002 7:47:26 PM EDT
[Last Edit: 4/7/2002 7:50:19 PM EDT by MRW]
Link Posted: 4/7/2002 8:33:06 PM EDT
hominahominahomina....green laser.....cool
Link Posted: 4/9/2002 12:05:30 AM EDT
Hello, The websites that I listed explain it better than I can but if you look at the Planck equation Q = hc/lambda you get 3.128x10^-19j/photon for 635nm and 3.734x10^-19j/photon for 532nm. So yes there is more energy per photon for 532nm light. The thing that makes all of the difference id the response of the eye or the eyes efficiency at converting the energy into a perceived brightness. The CIE curve describes how the eye responds to light. When you look at energy to the eye you are talking about photometry vs radiometry. "We know from the definition of the candela that there are 683 lumens per watt at a frequency of 540THz, which is 555 nm (in vacuum or air). This is the wavelength that corresponds to the maximum spectral responsivity of the human eye. The conversion from watts to lumens at any other wavelength involves the product of the power (watts) and the V(l) value at the wavelength of interest. As an example, we can compare laser pointers at 670 nm and 635 nm. At 670 nm, V(l) is 0.032 and a 5 mW laser has 0.005W×0.032×683 lm/W = 0.11 lumens. At 635 nm, V(l) is 0.217 and a 5 mW laser has 0.005W×0.217×683 lm/W = 0.74 lumens. The shorter wavelength (635 nm) laser pointer will create a spot that is almost 7 times as bright as the longer wavelength (670 nm) laser (assuming the same beam diameter), describes the conversion. To get the value for V(l) you can use the Gaussian approximation V(l) = 1.019e^-285.4(lambda - 0.559)^2. The only thing left is what is the damage threshold for the eye. This I do not know and have not found a good reference. Robert
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