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Info On Blood Trail Tracking Lights

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 10:23
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I work in electronics and have converted multiple conventional flashlights to LED based flashlights.  It just occurred to me that instead of using white LEDs I could use red and green ones mixed to make a blood detector.
 
I did a fast internet search and found that the Blood trail tracking light use red and green lights tuned to light frequencies that cause blood to be reflective.  Since colored LEDs are of very narrow bandwidth it should be quite easy to select the Correct Frequencies (color) LEDs to do this.  If I can identify the correct light frequencies needed I can extremely cheaply, convert flashlights to find blood for night time tracking.  Current 5mm Hi intensity LEDs are pretty cheap and I could easily convert a 6 volt latern flood for under $5.  What I don't know is the specific light frequencies needed other than red & green colored.  There are as many as 5 to 10 different LEDs all Red to our eyes but are different Frequencies, same applies for green LEDs.
 
 
This is an example:  8 10mm LEDS in a 2.5" reflector, bright enough that you can't look into them when ON but only draws 40mA.  With the 18v pack this will stay on for over 3 days straight before a pack charge is required.  I am sure that I could probably make a blood detector on this platform that would be stronger than anything on the market at a fraction of the price.
 
So, what does everybody know about Blood detectors in general and teh light frequencies?
 
All input would be welcome!  If it works out I would probably be able to offer the above platform minus the battery pack for $25-30 dollars plus shipping cost.
 
ALright Guys...Give me some input!!!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 10:39
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bud, have alook at this site. I am still searching but there are some spectrographic graphs that might help.
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 10:44
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Originally posted by budperm budperm wrote:

I work in electronics and have converted multiple conventional flashlights to LED based flashlights.  It just occurred to me that instead of using white LEDs I could use red and green ones mixed to make a blood detector.
 
I did a fast internet search and found that the Blood trail tracking light use red and green lights tuned to light frequencies that cause blood to be reflective.  Since colored LEDs are of very narrow bandwidth it should be quite easy to select the Correct Frequencies (color) LEDs to do this.  If I can identify the correct light frequencies needed I can extremely cheaply, convert flashlights to find blood for night time tracking.  Current 5mm Hi intensity LEDs are pretty cheap and I could easily convert a 6 volt latern flood for under $5.  What I don't know is the specific light frequencies needed other than red & green colored.  There are as many as 5 to 10 different LEDs all Red to our eyes but are different Frequencies, same applies for green LEDs.
 

 
This is an example:  8 10mm LEDS in a 2.5" reflector, bright enough that you can't look into them when ON but only draws 40mA.  With the 18v pack this will stay on for over 3 days straight before a pack charge is required.  I am sure that I could probably make a blood detector on this platform that would be stronger than anything on the market at a fraction of the price.
 
So, what does everybody know about Blood detectors in general and teh light frequencies?
 
All input would be welcome!  If it works out I would probably be able to offer the above platform minus the battery pack for $25-30 dollars plus shipping cost.
 
ALright Guys...Give me some input!!!


I thought blood tracking lights were blue, not green, but things may have changed since the last time I read up on it. I see red is now used  in combination as well.

Cool idea Bud!! Thunbs Up


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 11:43
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 Just checked one that a friend gave me yrs back(shows how much I don't use it). 4 LED's,2 red,and 2 blue.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 12:01
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With only 2 LEDS each I can see why it doesn't get used.  I am talking about 10-20 LEDs of each color.  Plus LEDs technology has come  a long way in just the last 2 years.  LED light outputs are up across the boards too.  So I am talking about considerably more light for easier detection.  The link Craig posted gave me a great starting points.  I think I will make a prototype or two and do a little testing. 
 
Who on the Mafia night hunts and could make use of such a tool?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 12:04
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i could really use a "built" flashlight for firefighting. i have a led flashlight and its great for use in the smoke, but it could always be brighter. the light i currently use is a 7 led streamlight.







Edited by pyro6999 - June/13/2009 at 12:08
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 12:14
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Blue LEDs are very good for tracking and picking up blood trails.  Aviation mechanics use them to so they can look for fluid leaks. 

Surefire makes a flashlight called the Kroma and that is why they put the blue LEDs in it.  I remember reading that after it came out.  Except it is like $300  Shocked
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 12:24
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 Mine was free,st,and Bud still made fun of it!!   Sad
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 12:28
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I have a Gerber Carnivore..... It does a fairly good job.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 12:29
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naw, bud ain't makin' fun of it he's just bein' contrary is all!
 
bud's design will pick up a blood trail at a half mile.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 12:39
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Problem with a 10 or 20 LED light is if u turn it on at night you can say goodbye to night vision.  Even if it is blue or red it could still kill it being that bright.  For night tracking I would think you would only want a light with 1 or 2 LEDs.  I have some keychain 1 led lights I use all the time for hunting and in the dark they easily light my way on a trail they allow me to keep my night vision. 

These are the ones I use and they are crazy bright for a 1 led, yet don't kill my night vision.  http://www.inovalight.com/micro.html
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 12:40
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bud it looks like you will need an LED around 445nm.  One source I read was also using  yellow or orange glasses acting as filters to enhance, but I believe this was after using a flourescein spray.  Not Sure if this would be required or if it would even enhance for your application.  Ilya may be a good resource here.
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 12:43
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Hey Bud...... Here's a great idea...... Make them for a hat mounted device, with a control for use as a light or blood tracking option. nNow that I've given you that idea...... I want say 20% of the take. Big Grin
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I suggest purple at about 405nm which will probably produce some UV (don't look directly at it), green at about 525nm (which makes it good for looking at a map), and blue for brightness at about 470nm.  You could probably substitute orange at about 605nm for the blue... it has about the same effect as red light, but won't impact your vision like white light.  You would have to do some experimentation with the colors mix to get the biggest result... remembering that your existing atmospheric conditions will also contribute.  Try to find a "standard day" to execute testing.  Time of day will also impact results. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 12:59
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  Billy,Browning does/did make one. I had one but gave it away. It had Browning logo on it anyways.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 13:22
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Originally posted by Kickboxer Kickboxer wrote:

I suggest purple at about 405nm which will probably produce some UV (don't look directly at it), green at about 525nm (which makes it good for looking at a map), and blue for brightness at about 470nm.  You could probably substitute orange at about 605nm for the blue... it has about the same effect as red light, but won't impact your vision like white light.  You would have to do some experimentation with the colors mix to get the biggest result... remembering that your existing atmospheric conditions will also contribute.  Try to find a "standard day" to execute testing.  Time of day will also impact results. 
 
whoa, 405nm is cutting it a little too close to UVC (365nm) which causes cateracts.  Dentistry using Vis-cure adhesive in Vis-blue range 405 to 425nm and even then it is recommended to wear UV eye protection.
 
LEDs are fairly monochromic with a very narrow range of emmission frequencies.  The one website I looked at before starting this string used green and red LEDs to minimize night vision loss and not spook game while getting acceptable blood detection.  Also if you mix too many color LEDs they tend to wash to white.
 
Experimenting I have to do!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 13:30
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Originally posted by 300S&W 300S&W wrote:

 Mine was free,st,and Bud still made fun of it!!   Sad
 
Earl, Bro, your killing me... I wasn't making fun of it.  You are the one that said it hardly ever gets used.  I only now realize that it has nothing to do with it's performance but more to the fact that it is well past your bedtime when the opportunity to use it comes along.  Sleep
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 13:34
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Originally posted by cyborg cyborg wrote:

Hey Bud...... Here's a great idea...... Make them for a hat mounted device, with a control for use as a light or blood tracking option. nNow that I've given you that idea...... I want say 20% of the take. Big Grin
   The hat brim mount as some merit but I would be worried about night vision loss and if wrong frquencies are used ...eye damage.
A lower powered brim version would definitely be an option on the hands-free line-up of Budster Lights!
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Hey I like the name:  BudLite
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 13:43
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I guess one of the things that started me down this path was the posting of the trophy Buck that was eaten overnight by wolfs cause they couldn't track him in the dark.  The platform (Dewalt flashlight) is not exactly light weight.  It is powerful and lasts a long time on a single charge.  I am sure lesser performers like a 2-3 cell maglite or such would also work well.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 13:55
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One of the strange things I learned about light is that the frequency of the light determines its reflective preference.  This means that a surface to the naked eye might appear course and grainular, but to certain frequencies of light it will appear to be a polished reflector.  We had an engineer who set up a office in teh corner of a Laser Lab. partitioned off and all.
He kept getting sunburns whenever the Laser was used heavily.  Turns out, the flat eggshell paint and corragated ceiling used in that Lab was a near perfect reflector for the secondary emmissions of the laser.  It was enough to give him sunburns from across the room.  Neat Huh?
 


Edited by budperm - June/13/2009 at 13:56
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The more I think about Kickboxer's suggestion of Purple light the more I like it.  It will take some research.  Purple light LEDs have a UV component to them that makes them somewaht dangerous, also Purple LEDs are among the weakest emission wise.  MMmmm not as straight forward as I originally thought! 
 
Please keep sharing your knowledge and or experiences Please, they are appreciated!
 
Billy, you said you have a Gerber?  that has 4 LEDs a 4 AA batteries right?  Can you expand on its operation?  How far away from blood does it work, battery life, etc. Thanks!
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 14:12
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I have a Surefire blood tracking flip-down lens (blue) on my scorpion that I bought several years ago. A few years ago one of the guests gut shot a deer just before sunset and it took us awhile to track him. I tried out the flip-down lens and it seemed to work ok. The blood trail was black in the light but it wasn't such a huge advantage that I'd recommend it.

The new technology, led lights with multiple settings, seems the way to go.





Edited by mike650 - June/14/2009 at 21:05
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/13/2009 at 14:14
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4 Blue and 4 Red.... It has a switch to change function from Blood Tracking to standard Xenon bulb light. The LED mode batteries last a good while. In the normal light mode the Xenon bulb eats batteries as any other typically does. It is a dogleg configuration with the standard light on top, and adjustable for stream. Beneath that are the LEDs where the reds are set up in an arch and the blues beneath them in a diamond.
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Night Vision loss is one of my biggest concerns.  I was thinking of having multiple banks of LEDs that can be switched in one at a time to prevent this.  It would also allow the Tracker to change intensity according to size of blood trail, ambient light and battery life.
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