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 cpkangaroo
      
Location: Longmont, CO
Gender: Male
 |  |  | Re: Headlamps
<Reply # 20 on 10/12/2005 2:37 PM >
|  | | | Posted by Slombat
I believe that the filter/red leds changes the wavelength of the light, red being a shorter wave it doesnt travel quite as far, and its better for your eyes at night.
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Red actually has the longest wavelength of all colors of visual light. It doesn't affect your night vision because it doesn't break down the rhodopsin (http://en.wikipedia.org/wiki/Rhodopsin) in the rod cells of your retina.
Really interesting link, by the way. I've got an old webcam sitting around, I'll have to give it a shot sometime.
[Edit]
In perusing older posts, I noticed Servo said the same thing a while backhttp://www.uer.ca/forum_showthread_archive.asp?fid=1&threadid=18610&currpage=1&pp#post7.
[last edit 10/12/2005 2:47 PM by cpkangaroo - edited 1 times]
Buy heroin, it's good! |
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Slombat
Location: space
RPG's anyone?
| | Re: Headlamps
<Reply # 21 on 10/12/2005 2:58 PM >
| | | | I was thinking of Infrared, it has the shortest. If you have the time the webcam thing is worth it.
www.RIUE.TK |
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grit1
Location: University Campus - Minneapolis, MN
Gender: Male
Got Shear Line?
| | | Re: Headlamps
<Reply # 22 on 10/12/2005 4:11 PM >
| | | | Posted by Slombat
I was thinking of Infrared, it has the shortest. If you have the time the webcam thing is worth it.
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Actually, the wavelength of infrared "light" is still longer than the rest of the spectrum visible to us humans -
 44176.jpg (66 kb, 728x562)
~Grit.
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Logan
 
Location: Ra-Cha-Cha, NY
Gender: Male
We miss you Jerry
| | |  | Re: Headlamps
<Reply # 23 on 10/12/2005 4:54 PM >
| | | | I picked up an Energizer lamp from Walmart the other day for 15 bucks. It has 4 white leds and 2 red. 2 of the white leds are "flood" and the other 2 are spotlight. You can change between 4 modes(the 2 flood, the 2 spotlight, all 4, and red). The visibility distance leaves something to be desired, but it really lights up the area your in.
Cogito Ergo Sum |
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tick
Location: Abingdon, VA
Gender: Male
| | | | Re: Headlamps
<Reply # 24 on 10/13/2005 12:39 AM >
|  | | | The Recoil LED lights give off almost a spotlight-like beam (a very bright spot, but no spill beam). IMHO, this would be good for spotting things at a distance, but bad for trying to navigate around in the dark.
Posted by grit1
Has anybody ever tried out one of these Pelicans?
http://www.pelican.../2680_headsup.html
It's got what they call a "recoil LED" that is mounted like a search light - facing back at the reflector. They boast 100% light efficiency on this design. Does anybody own this headlamp? Seems like a nice unit! ~Grit.
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44176.jpg (66 kb, 728x562)