ultra-bright IR LEDs

[Jim Hawkins]

"Mike" <nomtrxspam@comcast.net> wrote in message
news:2se0r35vf2v029d89b855c60e4rhds9lu1@4ax.com...

On Mon, 11 Feb 2008 02:29:50 -0000, CptDondo <yan@NsOeSiPnAeMr.com> wrote:

<snip>

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)

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

 

[CptDondo]

Anyone have a source for really bright IR (~900-950 nm wavelength) LEDs?

I'm trying to build a night camera. I've got the camera modified to see
in that wavelength but the 16 normal (20 ma) LEDs just don't provide
enough light. I could just build a whole sh*tload of 20 ma LED lights
but maybe if someone knows of some brighter ones I could save some
work....

I am trying to illuminate an area of about 12x30" from a distance of 18".

--Yan

 

[Mike Harrison]

On Mon, 11 Feb 2008 02:29:50 -0000, CptDondo <yan@NsOeSiPnAeMr.com> wrote:

Anyone have a source for really bright IR (~900-950 nm wavelength) LEDs?

I'm trying to build a night camera. I've got the camera modified to see
in that wavelength but the 16 normal (20 ma) LEDs just don't provide
enough light. I could just build a whole sh*tload of 20 ma LED lights
but maybe if someone knows of some brighter ones I could save some
work....

I am trying to illuminate an area of about 12x30" from a distance of 18".

--Yan

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

 

[Mike]

On Mon, 11 Feb 2008 02:29:50 -0000, CptDondo <yan@NsOeSiPnAeMr.com> wrote:

Anyone have a source for really bright IR (~900-950 nm wavelength) LEDs?

I'm trying to build a night camera. I've got the camera modified to see
in that wavelength but the 16 normal (20 ma) LEDs just don't provide
enough light. I could just build a whole sh*tload of 20 ma LED lights
but maybe if someone knows of some brighter ones I could save some
work....

I am trying to illuminate an area of about 12x30" from a distance of 18".

--Yan

Perhaps some of these might do it.
http://www.rentron.com/remote_control/IRLED.htm#6

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)

 

[ROB L]

On 11 Feb, 02:29, CptDondo <y...@NsOeSiPnAeMr.com> wrote:

Anyone have a source for really bright IR (~900-950 nm wavelength) LEDs?

I'm trying to build a night camera.  I've got the camera modified to see
in that wavelength but the 16 normal (20 ma) LEDs just don't provide
enough light.  I could just build a whole sh*tload of 20 ma LED lights
but maybe if someone knows of some brighter ones I could save some
work....

I am trying to illuminate an area of about 12x30" from a distance of 18".

--

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 ?

 

[GregS]

In article <d09e583b-d0fc-4121-a27a-f29dd6e3115d@i29g2000prf.googlegroups.com>, ROB L <h.lewis@connect-2.co.uk> wrote:

On 11 Feb, 02:29, CptDondo <y...@NsOeSiPnAeMr.com> wrote:
Anyone have a source for really bright IR (~900-950 nm wavelength) LEDs?

I'm trying to build a night camera. =A0I've got the camera modified to see=

in that wavelength but the 16 normal (20 ma) LEDs just don't provide
enough light. =A0I could just build a whole sh*tload of 20 ma LED lights
but maybe if someone knows of some brighter ones I could save some
work....

I am trying to illuminate an area of about 12x30" from a distance of 18".

--

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

 

[CptDondo]

On Tue, 12 Feb 2008 05:36:28 -0800, ROB L wrote:

On 11 Feb, 02:29, CptDondo <y...@NsOeSiPnAeMr.com> wrote:
Anyone have a source for really bright IR (~900-950 nm wavelength)
LEDs?

I'm trying to build a night camera.  I've got the camera modified to
see in that wavelength but the 16 normal (20 ma) LEDs just don't
provide enough light.  I could just build a whole sh*tload of 20 ma LED
lights but maybe if someone knows of some brighter ones I could save
some work....

I am trying to illuminate an area of about 12x30" from a distance of
18".

--

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

Inches. I'm trying to illuminate a reptile cage. See <http://
www.seiner.com> 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.)

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

EL-IR323/H0-A Everlight

<http://www.mouser.com/Search/Refine.aspx?
Ntt=*ELIR323H0A*&N=1323038&Ntx=mode%
2bmatchall&Ns=P_SField&OriginalKeyword=EL-IR323%2fH0-
A&Ntk=Mouser_Wildcards>

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

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

What mod has been done to what type of camera ?

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

 

[ROB L]

On 12 Feb, 14:53, CptDondo <y...@NsOeSiPnAeMr.com> wrote:

On Tue, 12 Feb 2008 05:36:28 -0800, ROB L wrote:
On 11 Feb, 02:29, CptDondo <y...@NsOeSiPnAeMr.com> wrote:
Anyone have a source for really bright IR (~900-950 nm wavelength)
LEDs?

I'm trying to build a night camera.  I've got the camera modified to
see in that wavelength but the 16 normal (20 ma) LEDs just don't
provide enough light.  I could just build a whole sh*tload of 20 ma LED
lights but maybe if someone knows of some brighter ones I could save
some work....

I am trying to illuminate an area of about 12x30" from a distance of
18".

--

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

Inches.  I'm trying to illuminate a reptile cage.  See <http://www.seiner.com> 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.)



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

EL-IR323/H0-A Everlight

http://www.mouser.com/Search/Refine.aspx?
Ntt=*ELIR323H0A*&N=1323038&Ntx=mode%
2bmatchall&Ns=P_SField&OriginalKeyword=EL-IR323%2fH0-
A&Ntk=Mouser_Wildcards



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

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



What mod has been done to what type of camera ?

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- Hide quoted text -

- Show quoted text -

have a look here

http://www.vishay.com/ir-emitting-diodes/

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.

 

[Michael A. Terrell]

"Mike" <nomtrxspam@comcast.net> wrote in message news:2se0r35vf2v029d89b855c60e4rhds9lu1@4ax.com...

On Mon, 11 Feb 2008 02:29:50 -0000, CptDondo <yan@NsOeSiPnAeMr.com> wrote:

Anyone have a source for really bright IR (~900-950 nm wavelength) LEDs?

I'm trying to build a night camera. I've got the camera modified to see
in that wavelength but the 16 normal (20 ma) LEDs just don't provide
enough light. I could just build a whole sh*tload of 20 ma LED lights
but maybe if someone knows of some brighter ones I could save some
work....

I am trying to illuminate an area of about 12x30" from a distance of 18".

--Yan

Perhaps some of these might do it.
http://www.rentron.com/remote_control/IRLED.htm#6

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)

Perhaps you're promoting some junky stuffs?

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Michael]

CptDondo wrote:

Anyone have a source for really bright IR (~900-950 nm wavelength) LEDs?

I'm trying to build a night camera. I've got the camera modified to see
in that wavelength but the 16 normal (20 ma) LEDs just don't provide
enough light. I could just build a whole sh*tload of 20 ma LED lights
but maybe if someone knows of some brighter ones I could save some
work....

I am trying to illuminate an area of about 12x30" from a distance of 18".

--Yan

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.)