Instructables

IR Led Sources

Anyone have a source for near-infrared LED's? I want to build a night light for my video surveillance system. Maybe NIR wouldn't alert "strangers" until they are captured on camera. Thanks.

kathy821 year ago
Most people use 850 because someone said camera are better at catching it.
Personally I think that using 940nm (which is commonly used in remote controls) is good and I am trying to use them, and they are more cheaper (I bought from http://www.lightingnext.com/940nm-infrared-led-strip-light.html )… Seems that developed film and floppy disc will allow about 850nm to pass more than 940nm, but you can also try them. I think it is ok.
Try Mouser

http://ca.mouser.com/search/Default.aspx

Just put IR LED in the search box
And then refine your search.
I think sites like Aliexpress.com and others in China are your best bet.
Just a word about whether you can see 850nM and 940nM leds.

Humans cannot see IR frequencies BUT because of the limitations in manufacturing leds to emit just the required frequency, the transmission spreads out either side of the chosen frequency.
In the case of 850nM this spills into the red end of the visible spectrum. So what you're seeing is not the 850nM but the wasted transmission in the visible range - probably close to 700nM.
The reason 940nM appears black is that 940nM is further away from the visible range and so it spills over in the IR range which you can't see.
liveleezgl1 year ago
No, westfw, not always the best move to alert intruders. Sometimes it can be interesting to see what people REALLY do when they think no one is around to see. A persons integrity is what they do when no one is looking.
sslogic3 years ago
as far as the human eye the 940nm leds give off no visible spectrum, and the "experts" say the 940nm ir lenses dont see them as bright, and make a horrible ir light source and should only be used for remote controls. as for the 850nm ir wavelenth, the led lights up red so you will see it at night, my personal experience has taught me, that if your using ir for lighting effect ie. night vision, than throw the 850 wavelenth out, you can see it, it draws attention. i only use the 940 and can not tell the diffrence from 850 and 940 through my cameras they both look just as bright, in compairison. as for pricing i just bought a buy it now off e-bay for 11.95 free shipping for 100 940nm high power 1.4-1.7v 100ma and that came with 10 resistors to wire 10 groups of 10 to a 12v power supply. what is that almost $.20/ resistor and $.10/ led doesnt get much cheaper
just do a search for "940nm
www.Ledshoppe.com has good prices and free shipping from China.

Plus lots of other goodies.

They have infrared in 2 different wavelengths, $6.99 per 100 or $7.99 per 100 depending on the wavelength.
Please forgive my ignorance but are IR LED's visible to the naked eye? I looked at the kits on BG Micro (wonderful website BTW). I mean what is the point to try to modify a webcam or surveillance cam for night vision if the LED's can be seen. can someone help me here I have heard so many contradictory things concerning their visibility.
doctek (author)  cobaltxxxfusion6 years ago
The kit I built (850nm LEDs) is certainly invisible to my eyes. Lights things right up for my little video camera though. Longer wavelengths (they have 940nm) should be invisible also, but I don't know if the camera is as sensitive to it. Sounds like it might be of interest here when I get all this to work to post a few images.
doctek (author) 6 years ago
Thanks, westfw, BG looks like it has just what I had in mind and I'm going to place an order with them. Right now I'm just "testing" to see how an IR light might work out. In general I agree with your notion of prevention. Interesting results might well become an Instructable.
westfw6 years ago
BG Micro has a couple sizes of IR "illuminator" kits with either 940nm or 850nm LEDS. I'm not sure if the IR LEDs they also sell are the same LEDs or not.

(in general, it's better to "alert" "strangers" so they stay away in the first place, isn't it?)