 |
|
|
UER Store
|
|
order your copy of Access All Areas today!
|
|
|
|
Activity
|
|
644 online
Server Time:
2024-05-11 16:16:47
|
|
|
 Chikote
 
This member has been banned
I R NO SPEL RITE
 |  | Re: Black Light Flashlight?
<Reply # 40 on 1/13/2004 7:19 PM >
|  | | | Posted by Super-8
Hey, it's a Light Fight! hehe
I kill me, I swear!
Asylunt
|
No, no I'm not going to argue about this any more, I have no idea what I'm talking about.
Someone once told me something about red light and human eyes and I completely forgot everything they said. And now I'm kicking myself because I had the chance to be useful, but I missed it because I'm too fricken dumb. And that just made things worse when everyone got pissed with me because I was being stupid pretending to know what I meant.
All I can say is "Red light is good, for some reason, use it to UE". But I can't back that up with anything.
Sorry.
Dear Chasey Lain, I wrote to explain, I'm your biggest fan, I just wanted to ask; Could I eat your ass? Write back as soon as you can. |
|
Crossfire
   
Location: Kay-Dub
Gender: Male
Don't call it a comeback, I've been here for years.
| |  |  |  | Re: Black Light Flashlight?
<Reply # 41 on 1/13/2004 7:59 PM >
|  | | | I've always heard that red light is good for UE because red light does not ruin our night vision (such as it is). I don't know the science behind it, but I'm sure it's got nothing to do with why lights on emergency vehicles are red - that's more to do with the psychology of colour. Red lights - that are bright enough - will attract more attention than white light. That's just because people are wired to pay attention to red lights - hence brake lights, emergency lights, microwave tower lights...
C.
Disgruntled. |
|
Ben
Noble Donor
Location: Mojave Desert
Gender: Male
| | | Re: Black Light Flashlight?
<Reply # 42 on 1/13/2004 8:11 PM >
| | | | Posted by Chikote
No, no I'm not going to argue about this any more, I have no idea what I'm talking about.
Someone once told me something about red light and human eyes and I completely forgot everything they said. And now I'm kicking myself because I had the chance to be useful, but I missed it because I'm too fricken dumb. And that just made things worse when everyone got pissed with me because I was being stupid pretending to know what I meant.
All I can say is "Red light is good, for some reason, use it to UE". But I can't back that up with anything.
|
Why didn't you just say that in the first place?
|
|
Chikote
This member has been banned
I R NO SPEL RITE
| | Re: Black Light Flashlight?
<Reply # 43 on 1/13/2004 8:15 PM >
| | | | Posted by Ben
Why didn't you just say that in the first place?
|
That's also what I am kicking myself for.
Dear Chasey Lain, I wrote to explain, I'm your biggest fan, I just wanted to ask; Could I eat your ass? Write back as soon as you can. |
|
Caenos
Location: Winnipeg, Mb
Gender: Male
| | Re: Black Light Flashlight?
<Reply # 44 on 1/14/2004 5:43 AM >
|  | | | Sorry about the 'attitude'... I had just got off work when I posted that, and my #1 pet peeve is ideas given as fact. Especially on a message board...
Did you know that 95% of statistics are made up on the spot?
I wonder whats behind THAT door? |
|
Chikote
This member has been banned
I R NO SPEL RITE
| | Re: Black Light Flashlight?
<Reply # 45 on 1/14/2004 11:38 AM >
| | | | Posted by Caenos
Sorry about the 'attitude'... I had just got off work when I posted that, and my #1 pet peeve is ideas given as fact. Especially on a message board...
Did you know that 95% of statistics are made up on the spot?
|
Oh that's ok, I completely understand. Lately I've been a bit of a jerk as well. Your pet peeve is fairly similar to mine, only mine is opinion given as fact.
And yeah, I did know that. And I've come to expect it.
I get all my statistics from internet sources. So should you. 
Dear Chasey Lain, I wrote to explain, I'm your biggest fan, I just wanted to ask; Could I eat your ass? Write back as soon as you can. |
|
RadEd
| | Re: Black Light Flashlight?
<Reply # 46 on 1/24/2004 10:37 AM >
| | | | red light has the lowest energy out of any of the visible lights. Thats the only explanation I've ever heard.
|
|
sympathy in chaos
Location: Chicago
Gender: Male
| | | | Re: Black Light Flashlight?
<Reply # 47 on 1/24/2004 7:58 PM >
| | | | Posted by Chikote
All I can say is "Red light is good, for some reason, use it to UE". But I can't back that up with anything.
Sorry.
|
I looked it up.
Your eyes have two types of photoreceptors, rods and cones. "The rods are more numerous of the photoreceptors, some 120 million, and are the more sensitive than the cones (compared to 6-7 million cones)However, they are not sensitive to color. They are responsible for our dark-adapted, or scotopic, vision. The rods are incredibly efficient photoreceptors. More than one thousand times as sensitive as the cones, they can reportedly be triggered by individual photons under optimal conditions. The optimum dark-adapted vision is obtained only after a considerable period of darkness, say 30 minutes or longer, because the rod adaption process is much slower than that of the cones.
The rod sensitivity is shifted toward shorter wavelengths compared to daylight vision, accounting for the growing apparent brightness of green leaves in twilight.
While the visual acuity or visual resolution is much better with the cones, the rods are better motion sensors. Since the rods predominate in the peripheral vision, that peripheral vision is more light sensitive, enabling you to see dimmer objects in your peripheral vision. If you see a dim star in your peripheral vision, it may disappear when you look at it directly since you are then moving the image onto the cone-rich fovea region which is less light sensitive. You can detect motion better with your peripheral vision, since it is primarily rod vision.
The light response of the rods peaks sharply in the blue; they respond very little to red light."
|
|
Caenos
Location: Winnipeg, Mb
Gender: Male
| | Re: Black Light Flashlight?
<Reply # 48 on 1/29/2004 5:21 AM >
| | | | THAT was what I was vaguly remembering... just too lazy to accually look it up. Kudos to the above post.
I wonder whats behind THAT door? |
|
Heartless
Location: Dakota Territory
Gender: Male
nowhere is a state of mind
| | | | Re: Black Light Flashlight?
<Reply # 49 on 2/5/2004 3:38 AM >
| | | | Posted by sympathyinchaos
I looked it up.
Your eyes have two types of photoreceptors, rods and cones. "The rods are more numerous of the photoreceptors, some 120 million, and are the more sensitive than the cones (compared to 6-7 million cones)However, they are not sensitive to color. They are responsible for our dark-adapted, or scotopic, vision. The rods are incredibly efficient photoreceptors. More than one thousand times as sensitive as the cones, they can reportedly be triggered by individual photons under optimal conditions. The optimum dark-adapted vision is obtained only after a considerable period of darkness, say 30 minutes or longer, because the rod adaption process is much slower than that of the cones.
The rod sensitivity is shifted toward shorter wavelengths compared to daylight vision, accounting for the growing apparent brightness of green leaves in twilight.
While the visual acuity or visual resolution is much better with the cones, the rods are better motion sensors. Since the rods predominate in the peripheral vision, that peripheral vision is more light sensitive, enabling you to see dimmer objects in your peripheral vision. If you see a dim star in your peripheral vision, it may disappear when you look at it directly since you are then moving the image onto the cone-rich fovea region which is less light sensitive. You can detect motion better with your peripheral vision, since it is primarily rod vision.
The light response of the rods peaks sharply in the blue; they respond very little to red light."
|
Exactly...it takes 30 minutes (according to the FAA) for one's eyes to completely adjust to a low light environment. If one is exposed to a source of bright light while their eyes are adjusted for said low light situation, it takes another thirty minutes to re-adjust. Hence, the reason why cockpit lighting in aricraft is red (usually, except in older ones), and hence the red lenses on the flashlights.
This is important to some UE situations, but not all. Using a regular flashlight isn't going to hurt anything; but if you are exploring somewhere where you can only use flashlights intermittently, then a red lens is an obvious advantage.
"I hope that I find you in heaven, because I'm so lost without you down here..."
Lost Highway Photography |
|
Lunis
Location: Durham Region
Gender: Male
Oh The Pleasures of Camo
| | Re: Black Light Flashlight?
<Reply # 50 on 2/10/2004 9:43 PM >
| | | |
Note... Street lights aren't amber to prevent light polution... Whtie light is brighter, thus making your eyes more tired over long periods of time its a safety "thing" that street lights are often not white so they won't cause tired eyes on drivers (sounds stupid but its true), Also the city says that aber cuts through the fog better then a white light will and if there is a white haze accross the stree what would be easier to see more white? or an amber? Amber of course...
Seriously though I've learned a whole crap load of stuff from this thread keep the info comming i'm taking notes!!
Keep Searching
Lunis
back from a long break |
|
Ben
Noble Donor
Location: Mojave Desert
Gender: Male
| | | Re: Black Light Flashlight?
<Reply # 51 on 2/10/2004 11:34 PM >
| | | | What we're all sure of is this: low pressure sodium streetlights aren't yellow because the sodium D spectral lines are around 589nm, right in what we call yellow.
Because that would be scientific, and that's bad.
|
|
sympathy in chaos
Location: Chicago
Gender: Male
| | | | Re: Black Light Flashlight?
<Reply # 52 on 2/11/2004 8:12 AM >
| | | | I heard that it's because it's close to sunlight, which our eyes are adjusted to. So it takes less light to see just a clear. It made sense to me.
Also, a cool tip for all you stealth fanatics. Blue looks like black under sodium lights.
|
|
MacGyver
Location: St Paul, Minnesota
Gender: Male
"Someone go find me a paperclip, a D-cell battery, and a cheese grater"
| | Re: Black Light Flashlight?
<Reply # 53 on 2/18/2004 1:20 PM >
| | | | Posted by sympathyinchaos
I heard that it's because it's close to sunlight, which our eyes are adjusted to. So it takes less light to see just a clear. It made sense to me. |
Too bad Ben is right. Sodium lights are that shade of yellowish orange for the same reason the sun is a yellowish white and the moon is a bluish white: they just are. Scientists didn't pick the color carefully to make sight easiers or anything. It just happens to be the color sodium bulbs run at due to the chemical makeup of the stuff inside them.
Like a fiend with his dope / a drunkard his wine / a man will have lust for the lure of the mine
"If you are not part of the solution, you are not dissolved in the solvent." |
|
|
|
All content and images copyright © 2002-2024 UER.CA and respective creators. Graphical Design by Crossfire.
To contact webmaster, or click to email with problems or other questions about this site:
UER CONTACT
View Terms of Service |
View Privacy Policy |
Server colocation provided by Beanfield
This page was generated for you in 187 milliseconds. Since June 23, 2002, a total of 741373493 pages have been generated.
|
|
