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700 online
Server Time:
2024-05-11 04:49:07
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 Crispy Critter
Location: Chicago
Gender: Male
It is now pitch dark. You are likely to be eaten by a grue.
 |  | Re: Black Light Flashlight?
<Reply # 20 on 1/9/2004 8:09 PM >
|  | | | Actually, the human eye is most sensitive to green light. Thus, a 5 mW green laser (532 nm wavelength) will seem to be a great deal brighter than a 5 mW, 650 nm red laser. With red lasers, 635 nm will seem brighter than 650 nm for a given power level.
This also has safety ramifications; a near-infrared laser might seem barely visible, yet pack a wallop.
"And here you thought the worst thing you could do was pee on the third rail." -Cecil Adams |
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Corporeal Punishment
Location: Lima Center, WI
Gender: Male
Welcome to your heart...
| | Re: Black Light Flashlight?
<Reply # 21 on 1/9/2004 9:06 PM >
|  | | | Um, regardless of the safety issues, and to get this thread back on topic, you can pick up small, battery powered blacklight flashlights (actually more of a tiny flourescent bulb) at alot of novelty shops. I don't know if they have Spencer's where you're at, but you probably have at least an equivalent at your nearest mall. For the record, they use these to hunt scorpions in the Arizona desert as scorpions flouresce under UV light. I always thought it would be neat to use on of these out in the woods, but I wouldn't rely on it for secrecy and/or exploration.
Suit by Armani...Balls by King Kong.
"Please do not offer my god a peanut" |
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Chikote
This member has been banned
I R NO SPEL RITE
| | Re: Black Light Flashlight?
<Reply # 23 on 1/10/2004 8:44 PM >
| | | | Posted by Ben
Hey, flashlights use both parabolic reflectors and lenses, so this isn't off topic. I think we can both agree that Chikote was wrong; the speed of light has nothing to do with the use of red light.
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You only agree I am wrong because you like saying I'm wrong.
Red light is useful in UE, for the same reasons that it is useful for it to be on the rear of a car, or train. And for the same reasons that streetlights are often amber, to help prevent light pollution.
Blue is used on police and ambulances because it is exactly the opposite of red, it is bright, whereas red is quite dim. The majority of light emitted by a red light is emitted as infrared, whereas the majority of light emitted by a blue bulb comes out as visible light. (apparantly). Also, from what I've been told, blue light travels furthest. With white light either being second to blue, or blue light being second to white. Or something like that.
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. |
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Caput_58
   
Location: Virginia, USA
Gender: Male
| |  | Re: Black Light Flashlight?
<Reply # 25 on 1/11/2004 12:07 AM >
| | | |
I started writing up a very sarcastic/smartass response, but I decided to delete it because a) the sarcasm would probably be taken seriously and b) I've probably burned enough bridges here being a smartass.
So I'll just note that Chikote's explanations of why ambulances/police cars use blue lights is problematic. For once, in alot of places, ambulances use red lights, usually supplemented with white strobes. The same is true of police. But in any case, emergency vehicle lighting is designed to be eye catching. Flashing colored lights, blue or red, work well for this. Other colors would also work, but public perception generally limits the choice to the traditional colors.
Caput_58
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Asylunt
Location: MPLS
Gender: Male
The Friendly Beer!
| | |  | Re: Black Light Flashlight?
<Reply # 26 on 1/11/2004 8:42 AM >
| | | |
You know, we could get a few of those UV marker pens and leave arrows and messages in UE locations, that only other explorers carrying UV lights could see/read.
It's a whole new element of fun, like easter eggs at a popular sight.
Asylunt
P.S.-would this be considered vandalism?
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover." Mark Twain |
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Chikote
This member has been banned
I R NO SPEL RITE
| | Re: Black Light Flashlight?
<Reply # 27 on 1/11/2004 9:37 AM >
| | | | Posted by Super-8
You know, we could get a few of those UV marker pens and leave arrows and messages in UE locations, that only other explorers carrying UV lights could see/read.
It's a whole new element of fun, like easter eggs at a popular sight.
Asylunt
P.S.-would this be considered vandalism?
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It would only be considered vandalism if it visually defaced what was there previous to your visit, and if you did it deliberately.
If you cannot see the affects of your UV marker with the naked eye, then you are safe.
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. |
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Mancubus
| | Re: Black Light Flashlight?
<Reply # 28 on 1/11/2004 7:50 PM >
| | | | Why bother? Regular highlighters do the same thing.
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mike-o
Location: Philadelphia
Gender: Male
Wake up little penguin... Penguintopia's open to the public
| | | Re: Black Light Flashlight?
<Reply # 29 on 1/11/2004 9:09 PM >
| | | | I'm pretty sure that blue light does travel the farthest compared to all other colors of light visible to the human eye, thats why in hospitals and nursing homes they have those little blue lights in the hallways as backup lights, I guarantee if you had red lights at that intensity you could barely see anything lit by them... and I think blue is better than white as far as this characteristic goes
Posted by El_Gordo_Uno
Yes, I'm sure a fucken doctor gave you Cocaine.
Jesus christ...
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My grandmother was given cocaine in a hospital... no joke
[last edit 1/11/2004 10:28 PM by mike-o - edited 2 times]
UER is a great idea and I love the LDB... but this forum sucks my ass. later |
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Caenos
Location: Winnipeg, Mb
Gender: Male
| | Re: Black Light Flashlight?
<Reply # 30 on 1/12/2004 1:52 AM >
|  | | | Posted by Chikote
Posted by Ben
Hey, flashlights use both parabolic reflectors and lenses, so this isn't off topic. I think we can both agree that Chikote was wrong; the speed of light has nothing to do with the use of red light.
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You only agree I am wrong because you like saying I'm wrong.
Red light is useful in UE, for the same reasons that it is useful for it to be on the rear of a car, or train. And for the same reasons that streetlights are often amber, to help prevent light pollution.
Blue is used on police and ambulances because it is exactly the opposite of red, it is bright, whereas red is quite dim. The majority of light emitted by a red light is emitted as infrared, whereas the majority of light emitted by a blue bulb comes out as visible light. (apparantly). Also, from what I've been told, blue light travels furthest. With white light either being second to blue, or blue light being second to white. Or something like that.
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Didn't you claim to be a sniper in some other thread?
Then wouldn't you have SOME sort of military training?
Then would you not know that blue is (arguably) the least visible colour in low light conditions (hence why dark blue uniforms are popular for ERT units)...
Careful you don't step in the BULLSHIT.
I wonder whats behind THAT door? |
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ReAct
Location: Northern Jersey... For now.
Gender: Male
| | | Re: Black Light Flashlight?
<Reply # 31 on 1/12/2004 2:13 AM >
| | | | Posted by Caenos
Then would you not know that blue is (arguably) the least visible colour in low light conditions (hence why dark blue uniforms are popular for ERT units)... |
When the F-117 was being developed it was decided that because the plane was to predominantly fly night missions, the color that would best camouflage it in the night sky was a deep purple. This was presented to the Air Force who promptly responded with: "The Air Force doesn't fly purple planes: You're painting it black."
-ReAct
[last edit 1/12/2004 2:14 AM by ReAct - edited 1 times]
"'13.2V...' Thirteen volts. It's thirteen volts? Jesus, I could practically be made of salt water and this wouldn't hurt me."
"That says '13.2kV.'"
"Ohhhh... Thirteen-thousand volts... I suppose that's a little different...." |
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Crispy Critter
Location: Chicago
Gender: Male
It is now pitch dark. You are likely to be eaten by a grue.
| | Re: Black Light Flashlight?
<Reply # 32 on 1/12/2004 2:18 AM >
| | | | Blue light is most scattered by gas molecules (which is why the sky is blue). Of course, the more light is scattered, the less reaches its target.
http://math.ucr.edu/home/baez/physics/General/BlueSky/blue_sky.html
"And here you thought the worst thing you could do was pee on the third rail." -Cecil Adams |
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sympathy in chaos
Location: Chicago
Gender: Male
| | | | Re: Black Light Flashlight?
<Reply # 33 on 1/12/2004 12:43 PM >
| | | | I think by speed, you mean wavelength. Blue has the shortest wavelemgth and red has the longest.
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Frost
Location: K.Dot
Gender: Male
No beer makes Frosty go..something something..(Taz: Crrazzy?)..Dont mind if I doo!
| | | Re: Black Light Flashlight?
<Reply # 34 on 1/12/2004 1:07 PM >
| | | | I'm a little late posting, but I have many blacklights, one in my room, a shit load of bulbs and a little mini blacklight/flashlight combo. The damage factor with something small like that wouldn't affect anything in a horrible way if at all, but I find that the main problem would not be the damage (although that would be in consideration) but that the blacklight will make anything white glow. If it's powerful enough you can cause a whole room to glow like I do in my bedroom. The light would just be a bad idea, too visible for security and the like.
Why is marijuana not legal? Why is marijuana not legal? Its a natural plant that grows in the dirt. You know what's not natural, 80 year old dudes with hardons. Thats not natural, but we got pills for that. We're dedicating all our resources to keeping the old guys erect but we're puttin people in jail for smoking something that grows in the dirt. |
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Chikote
This member has been banned
I R NO SPEL RITE
| | Re: Black Light Flashlight?
<Reply # 35 on 1/12/2004 2:39 PM >
| | | | Posted by sympathyinchaos
I think by speed, you mean wavelength. Blue has the shortest wavelemgth and red has the longest.
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That's the one! Yeah that was exactly what I was trying to get at.
Thanks! 
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. |
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Frozen
Location: Minneapolis, MN
Gender: Male
Three-D
| | | Re: Black Light Flashlight?
<Reply # 36 on 1/13/2004 1:42 AM >
| | | | Posted by mike-o
I'm pretty sure that blue light does travel the farthest compared to all other colors of light visible to the human eye...
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spRocket was right, the human eye is most sensitive to green light at 555nm. That's why all those new 3M street signs are lime green and very bright. Our cones perceive red (peak sensitivity at 580nm), green (peak sensitivity at 540nm), and blue (peak sensitivity at 450nm) light and the overlap of the sensitivities of different cones at different colors makes lime green light the brightest to us. Ok so that was very non-technical but I'm hungry and going to eat something now 
Urban Exploration |
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Caenos
Location: Winnipeg, Mb
Gender: Male
| | Re: Black Light Flashlight?
<Reply # 37 on 1/13/2004 4:59 AM >
| | | | Posted by Chikote
Posted by sympathyinchaos
I think by speed, you mean wavelength. Blue has the shortest wavelemgth and red has the longest.
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That's the one! Yeah that was exactly what I was trying to get at.
Thanks!
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Then where the hell do you get your little traffic light story?
But if you are talking about a light with a black filter, then I'd suggest a dark red filter instead. Because red light travels the slowest, it will dissapate quickest, meaning it will not be bright to someone about 20 or so meters away, and won't be obvious to someone who is closer. Which is why streetlights are amber, it's a compromise between the bright light of a white bulb, and the slow travelling red.
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what does THAT have to do with wavelength?
[last edit 1/13/2004 5:00 AM by Caenos - edited 1 times]
I wonder whats behind THAT door? |
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Chikote
This member has been banned
I R NO SPEL RITE
| | Re: Black Light Flashlight?
<Reply # 38 on 1/13/2004 10:36 AM >
| | | | Posted by Caenos
Then where the hell do you get your little traffic light story?
what does THAT have to do with wavelength?
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I dunno what it was all about, but I sure could do without the attitude.
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. |
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Asylunt
Location: MPLS
Gender: Male
The Friendly Beer!
| | | | Re: Black Light Flashlight?
<Reply # 39 on 1/13/2004 1:12 PM >
| | | | Hey, it's a Light Fight! hehe
I kill me, I swear!
Asylunt
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover." Mark Twain |
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