[PD] OT: Ir leds
derek at umatic.nl
Mon Aug 30 09:54:00 CEST 2010
You probably want the brightest ones (usually measured in in mcd) you
can get! Besides that, if you know anything about the camera you are
using that would help a lot, for example which part of the spectrum in
nanometers it is most sensitive to. Then you can match it to the
spectrum emitted by the LEDs.
Another characteristic is the angle of the LED, in your case you
probably want them to be pretty wide.
Some LEDs are low current or ultrabright, which mean they are better at
making light from current. Ultrabrights, however use a ton of current at
their brightest. This is usually only a concern if you are running from
a battery or very weak power supply (or in something like a voltage
controlled synthesizer when a sudden big current draw can have audible
So once you understand the characteristics of the LEDs, you can choose
the ones for your budget. You'll still have to do a lot of testing to
get the right amount of light for the space and your camera. It's always
of a question of whether you have more money than time, or time than money.
Somehow I seem to have neither these days, I wonder what I'm doing
On 8/30/10 4:44 AM, ronni montoya wrote:
> Hello everybody, i dont know if here is the correct place to ask, if
> anybody know another forum related to this , i will be very happy if
> somebody can show me:
> Im making an interactive floor and i need to iluminate a space of 4 x
> 4 meters with ir light.
> I been seen there are some ir leds matrix on survillance stores but
> they are expensive to my budget, so i was thinking that i can build my
> own ir led matrix .
> I been seen there are tons of different types of ir leds with
> different characteristics.
> Do anybody know which ir leds do i need for this?
> which model, label or serial number?
> Any idea would be appreaciated
> thank you very much
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::: derek holzer ::: http://macumbista.net :::
---Oblique Strategy # 183:
"When is it for?"
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