I’ve used a similar setup as in the first part as this will enable me to experiment with the values more flexibly.
As you can see the 4230 really lights up, and I got very exited about it when I first took this picture.
Next, let’s have a result with all the test projections will the different IR LED’s.
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June 21st, 2005 at 4:04
“hey, I can still see good
(or at least I’m under that impression.)”
*as he crashes into the doorjam on the way out of his office*
June 24th, 2005 at 13:33
hmmm. i think IR does do somthing to your eyes, i have forgotten what though. I think its to do with radiation.
June 28th, 2005 at 10:28
Chris:
It looks like if you were making your experiments in total darkness, so probably
the problem with your headache comes from your eye trying to catch light where there
is not. Your iris makes efforts, wide open, to let pass light that doesn’t arrive,
so the wear is reflected in headache. As you remark in your text, it is not a good
idea looking straight into a lit LED like the one you’re using (no one would make
it in a pointer LASER, I think), for the emitted power is so great that it could
be dangerous for retina integrity.
My best wills to your investigations, which I hope you’ll get on…
July 27th, 2005 at 4:06
I got this from searching within PubMed
Cataracts occur frequently among workers who deal with hot material such as molten glass or steel, as a result of exposure to intense infra-red radiation (i.r.) emitted from it.
It is suggested that i.r. cataracts in the workplace result from the generation of heat by absorption of i.r. in the cornea and heat conduction to the lens.
This absorbtion depends on the emitted power from the IR led over the surface area of your retina.
October 10th, 2005 at 5:40
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October 25th, 2005 at 10:27
I don’t think this kind of IR could be dangerous for your eyes. UV makes you blind not IR, that’s why we wear sunglasses.
Most of camera are using IR for their auto-focus system, and I never heard about people getting blind because of this.
October 25th, 2005 at 11:20
Hmm, I guess you have a point! Thanks!
November 18th, 2005 at 15:24
Hi - my work involves infra-red lasers, and I can tell you the following:
1) Near Infra-red causes burns to the retina at high powers.
2) The problem is that the blink reflex doesnt work with IR, so you dont realise you’re getting burnt
3) IR lasers are generally considered to be eye safe for powers below 1mW
4) IR Lasers above 5mW are considered definitely an eye hazard
So I would recommend being careful, and not looking at the LED at close range -
at larger distance the beam spread means that not all the energy enters your eye,
but at short distances you could do yourself permanent damage.
(A laser is just a LED with much tighter beam spread, and so all the laser light can enter the eye
at large distances. )
Treat it the same way as you would a high-power white LED - you wouldn’t stare into that would you!
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April 17th, 2006 at 9:34
It looks like if you were making your experiments in total darkness, so probably
the problem with your headache comes from your eye trying to catch light where there
is not. Your iris makes efforts, wide open, to let pass light that doesn’t arrive,
April 17th, 2006 at 9:38
I can still see good (or at least I’m under that impression.)”
May 8th, 2006 at 21:23
Hi - my work involves infra-red lasers, and I can tell you the following:
1) Near Infra-red causes burns to the retina at high powers.
May 8th, 2006 at 21:24
Most of camera are using IR for their auto-focus system, and I never heard about people getting blind because of this.
May 9th, 2006 at 16:59
Hi,
I would definitely say that it isn’t intelligent to look into lit LED’s.
Otherwise, thanks for the great project, just what I have been looking for.!
May 20th, 2006 at 1:26
I never heard about people getting blind because of this.
May 20th, 2006 at 4:59
It looks like if you were making your experiments in total darkness, so probably
the problem with your headache comes from your eye trying to catch light where there
is not. Your iris makes efforts, wide open, to let pass light that doesn’t arrive,
June 3rd, 2006 at 7:30
Hi,
I would definitely say that it isn’t intelligent to look into lit LED’s.
Otherwise, thanks for the great project, just what I have been looking for.!
September 12th, 2006 at 2:30
I would definitely say that it isn’t intelligent to look into lit LED’s.
September 12th, 2006 at 2:33
Most of camera are using IR for their auto-focus system, and I never heard about people getting blind because of this.
October 20th, 2006 at 4:35
It looks like if you were making your experiments in total darkness, so probably
the problem with your headache comes from your eye trying to catch light where there
is not.
November 6th, 2006 at 18:08
I don’t think this kind of IR could be dangerous for your eyes. UV makes you blind not IR, that’s why we wear sunglasses.
August 25th, 2007 at 10:07
Cataracts occur frequently among workers who deal with hot material such as molten glass or steel, as a result of exposure to intense infra-red radiation (i.r.) emitted from it.
August 25th, 2007 at 10:09
so the wear is reflected in headache. As you remark in your text, it is not a good
idea looking straight into a lit LED like the one you’re using (no one would make
March 19th, 2008 at 9:26
Warning man, IR rays just COOK your eyes!
Te proof is that you CAN’T use a negative film to protect your eyes while looking at a solar eclipse, as you’ll THINK it’s shielding, as it shields VISIBLE light, but the sun IR will BURN your eye!
And negative film is what you use to get an IR cam from a standard cam, right?
April 7th, 2008 at 18:05
Hi ther my mane is Jimmy. i have installed a few night vision camera in a vets holding room, and the ? has come up about the camara uses Infrared LED for it’s night vision. Are there any long trem problems with being under the LED for a long time frams.. i have not been able to find any info about this can u help???
July 13th, 2008 at 14:07
“(A laser is just a LED with much tighter beam spread, and so all the laser light can enter the eye
at large distances. )”
Not to nitpick, but a laser is very different than an LED. A laser emits coherent, virtually monochromatic light, while an LED emits over a broad frequency range. Some lasers are based on LEDs (i.e. diode lasers), but are also based on many other materials (dye lasers, rubies etc.).
I would guess that lasers at the right wavelength would be more dangerous than leds not only because all the energy is focused in a narrow spatial range, but also in a narrow wavelength range.