IR llumination library.

Flashlights, IR illuminators. Projects, reviews and queries. DIY 'stickies' here too.
Radagast
junior librarian
Posts: 2616
Joined: 04 Apr 2013, 10:51
Location: Sydney Australia

IR llumination library.

Postby Radagast » 08 Apr 2016, 15:56

The Beginning.
In the beginning God created the heavens and the earth.
Now the earth was formless and empty, darkness was over the surface of the deep, and the Spirit of God was hovering over the waters.
And God said, “Let there be light,” and there was light.
God saw that the light was good, and he separated the light from the darkness.

Then some crafty buggers decided to see in the darkness. Which is where we come in.
This post is a compilation of threads discussing various forms of illumination for night vision devices.

Digital NV requires illumination and Gen I & II tubed night vision can benefit from it.
Illumination is provided by shining an infrared light on the target area. This reflects back into the viewing device.
Near Infrared is a wavelength of light that the human eye cannot see very well. Nor can most of the things we want to shoot at. Some will respond to 850nm IR, but not 940nm IR.

Illumination can be in the form of LED torches, incandescent lamps with an filter that only allows IR through, or Lasers that emit in the near infrared.
Incandescent lamps are inefficient as much of the output is in the form of visible light that then has to be blocked by the filter. They also tend to be large.
Lasers tend to have a 'dirty' image, with inconsistent brightness. Lasers are also dangerous, coherent light can blind, reflected coherent light can still damage the eyes. Infra Red lasers are potentially more dangerous because the eye does not 'see' the beam and the pupil does not contract. Visible lasers are considered unsafe if over 5 milliwatts output. Some IR lasers have 500 milliwatts.
Eye safe lasers exist, they have a honeycomb filter in front of the laser to break up the beam. This creates a very speckled image and limits the effective range. Some shooters remove the filter to improve the image. This means you cannot be sure that an 'eye safe' laser is actually safe unless you have maintained possession of the unit from factory new.

Never shine a laser into your eye or at any form of reflective surface.

LED torches emit light in a narrow band, so they are much more efficient than incandescent lamps. They are also more eye safe than lasers, but are not truly eye safe. The better LED IR torches will throw a beam 500 meters. Shining a 500m capable white light into ones eye would be considered the height of stupidity. Doing the same with an IR torch is asking for eye damage as the same amount of energy is falling on the rods and cones of the eye.

Never look into an LED IR torch to see if it is on. Use an NV device.

Phoenix tests the output of various commercial and custom made IR torches.
viewtopic.php?f=31&t=3684
viewtopic.php?f=31&t=12957

LED focused spot size compared between common IR torches:
viewtopic.php?t=5261

Clive Wards field test of his NV torches:
http://nightvisionforumuk.com/viewtopic.php?t=12275

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Commercially available torches:
---------------------------------------
T67:
viewtopic.php?t=10016

Chinese source for T20, T38, T50, T67 torches:
viewtopic.php?t=9883

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Custom Builds:
------------------

74mm Rolson torch conversion by Poppy mae:
viewtopic.php?t=3207

Cutting a torch body down and fitting to a project box with a bushing:
viewtopic.php?f=31&t=14226

Cutting a torch body down and fitting with a 12 volt conversion:
viewtopic.php?f=31&t=13499

SunnyDlight by Sunndog:
viewtopic.php?f=31&t=1193
viewtopic.php?f=31&t=1080

SunnyDlight V2.0 by Sunndog:
50mm Aspheric lens, Maglight head and push to zoom Cree torch conversion.
viewtopic.php?t=1306

78mm T20 conversion by Sunndog:
http://nightvisionforumuk.com/viewtopic.php?t=3993

T60 - T20 with Sony Doubler lens:
http://nightvisionforumuk.com/viewtopic.php?f=31&t=5666
viewtopic.php?f=31&t=6967

Sunnranger conversion of the T20:
viewtopic.php?f=31&t=10617
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SikaStag
------------
UKNVF member Sika Stag produces Markylight designs for sale, along with Crelant Head conversions of the T20 & 74mm aspheric lens conversions of the T20:
http://nightvisionforumuk.com/viewtopic.php?f=31&t=2176
Crelant Head illuminator, Markylight style:
http://nightvisionforumuk.com/viewtopic.php?f=31&t=2618
---------------
Markylights:
---------------
UKNVF member Marky610 produced a number of custom IR conversions prior to the T series torches becoming popular.

Markylight Mk1:
viewtopic.php?f=31&t=848
MarkyLight Mk4:
viewtopic.php?f=31&t=1198
viewtopic.php?f=31&t=1273
viewtopic.php?f=31&t=848
viewtopic.php?f=31&t=1339
Maglight, aspheric lens and 12 volt conversion:
http://nightvisionforumuk.com/viewtopic.php?f=31&t=1309
Original Rangerlight with lens scavenged from a Yukon Ranger:
viewtopic.php?t=2875
Rangerlight T38 conversion with Yukon head. Similar to SunnRanger:
viewtopic.php?f=31&t=10152


Before the Markylight there was the Lardylight designed by Lordlardofftherams and copied by others:
viewtopic.php?f=8&t=749
http://nightvisionforumuk.com/viewtopic.php?t=878
viewtopic.php?t=982
viewtopic.php?t=1104

Lardy also did the development that led to the IR Nightmaster 800:
viewtopic.php?t=947

Aspheric lens discussed:
viewtopic.php?t=1040
viewtopic.php?f=31&t=10617

Pulsar L808 laser vs Dipol N1000 laser:
viewtopic.php?t=853


Torch mounts:
viewtopic.php?t=1008
viewtopic.php?f=29&t=10512


Red & white LEDs for primitive lamping:
viewtopic.php?f=31&t=2242
viewtopic.php?t=947
viewtopic.php?f=31&t=7429
viewtopic.php?f=31&t=6604
viewtopic.php?f=31&t=1852

Tracer and Cluson Interceptor gun lights for really primitive lamping:
viewtopic.php?f=31&t=1301

Using an IR pass filter to reduce red glow at the torch:
viewtopic.php?f=31&t=7885


battery discussions:
viewtopic.php?f=29&t=10610
viewtopic.php?f=29&t=2971
viewtopic.php?f=29&t=11436

Image flicker caused by driver in torch:
viewtopic.php?f=3&t=10483

Incomplete listing.

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