Electronics > Projects, Designs, and Technical Stuff

Wavelenght of IR-lights in CCTV's

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cs.dk:
I'm planning to buy a couple of cameras to extend my UniFi setup - How ever, many reviews on the G3 cam notices the IR-light doesn't reach very long.

Instead of buying the expensive G3 Pro or really expensive G4 cam, I thought it may be possible to make an "IR floodlight". Maybe build into to a standard halogen floodlight housing.
I've never designed a PCB before, but I think with some practice, it should be doable, and a way cheaper solution.

Does anyone know the wavelenght of the IR light i standard cameras?

oPossum:
Usually 840 or 850 nm.

cs.dk:
Thank you :)
Looks like 850 nm is the most popular. TME has 20 different models, only one single 840 nm.

Need to figure out the viewing angle, and how many/how powerful they need to be to light up ~25m

Kleinstein:
Usually it is 850 nm to 950 nm. The 850 nm LEDs may be just visible as dim red light, but can have better sensitivity with modern detectors. The possible visibility is as the spektrum extends to both sides. So a 850 nm LED will still emit a little at 800 nm and 750 nm.

If in doubt one should test if 950 nm is still OK with the camera before ordering a larger number.
Besides the sensor there can also be absorption in the lens starting at 950 nm.

The limited range is usually just from geometry, as the brightness goes down as the distance square. So its independent of wavelength.

NiHaoMike:
Just look up "IR illuminator" on Amazon and there are a lot of ready made modules for that purpose. Based on reviews, the ones with a few high power LEDs seem to be more reliable than the ones with a cluster of 5mm LEDs.

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