ultra-bright IR LEDs

You could use an MR16 type halogen lamp with an IR filter....

Perhaps some of these might do it.

Mike

"In view of such harmony in the cosmos which I, with my limited human mind, am able to recognize, there are yet people who say there is no God. But what really makes me angry is that they quote me for the support of such views." Albert Einstein (theoretical Physicist)

Do you mean 12x30ft (3600sq ft) from a distance of 18ft or 12x30in (2.5sq ft) from 1.5ft ?

What do you mean by 'normal' Leds - wavelength, power output, theta ?

Are you sure that you need 900 to 950nm leds - many CCDs are more responsive at shorter wavelenths which would be best served by using

880nm devices

What mod has been done to what type of camera ?

I think I would try a light bulb and filter for high intensity.

greg

Inches. I'm trying to illuminate a reptile cage. See for the snakecam. (Definitely alpha quality ATM; I'm shooting through the glass of the tank.) (I haven't figured out how to get the camera mounted in the tank so that a. the snake won't use it as a perch, and b. any holes I cut in the tank the snake will use to escape.)

EL-IR323/H0-A Everlight

Well, that's part of the problem. See below.

I tested this with an ordinary Logetech webcam, which I took apart and removed the IR filter. It worked like a charm; that camera sees the 940 nm LEDs as a bright light source. Unfortunately I can't find an embedded computer that can run one of these reliably. Webcams are pretty resource intensive, and the basic 200 MHz embedded machine won't handle one beyond a too-low resolution. So after many attempts I switched to a Airlink AIC250 IP camera. I removed the IR filter from it, but the camera isn't nearly as sensitive in the 940-950 nm range as I'd hoped.

Based on your comments, which confirm my suspicions, I think I need to experiment with 880nm LEDs. I can't find a source of high intensity IR LEDs in that range, though.

Thanks,

--Yan

ED

d e

have a look here

Note the comment about IR leds for CCTV though they are not particularly 'special' for CCTV other than having shorter wavelengths.

There are plenty of other manufacturers but Vishay came to hand first.

You will neeed a small array of leds depending upon the camera.

You are repeating a slur on Albert Einstein that the religiose love to foster. He never wrote or said those words. They are from a passage which, when the deliberately omitted words are restored, is seen to mean the exact opposite of what the misquotation appears to say. What did Einstein say elsewhere about those who attribute religious belief to him ? This:- "It was, of course, a lie what you read about my religious convictions, a lie which is being systematically repeated. I do not believe in a personal god and I have never denied this but expressed it clearly.."

Jim Hawkins

Plain ol' ~20ma IR LEDs from All Electronics worked for me. I built a board of

2 banks x 6-series-LEDs and mounted that alongside a nothing-special miniature CCD camera (not web cam though), about 3-4 feet away from the subject. Viewed area was approx. 4ft square (maybe as much as 4x5 ft.)