940nm LEDs

Flashlights, IR illuminators. Projects, reviews and queries. DIY 'stickies' here too.
superslack
Posts: 77
Joined: 08 Feb 2016, 23:58
Location: Virginia

940nm LEDs

Post by superslack » 20 Nov 2017, 23:29

I've been waiting for the 940nm Osram SFH 4725as product launch that others have shared here. I'm interested to see if we can get good illumination with less visible signature at the IR source when using the longer wavelength.

I found that LED Engin introduced high power 940nm leds this summer:
https://www.mouser.com/ProductDetail/LE ... tRrw%3d%3d

The above LED comes premounted on a star and ready to install in a torch.

They also have a large size 12V model that should put out a very large amount of "light"
https://www.mouser.com/ProductDetail/LE ... UkBQ%3d%3d

LED Engin was aquired by Osram this past summer so perhaps there LEDs are repackaged Osrams...or the Osrams will be repackaged LED Engins.

In addition, LumiLED has a 940nm LED that has 50% more mW/sr than the 850nm Osram SFH 4715AS. It also uses the same stars (solder pad dimensions are identical).
https://www.mouser.com/ProductDetail/Lu ... hCUA%3d%3d

Has anybody used any of these to make an illuminator?

lightmesser
Posts: 536
Joined: 09 Jan 2014, 01:19
Location: Eastern Europe

Re: 940nm LEDs

Post by lightmesser » 26 Nov 2017, 12:19

Guys don't get me wrong but this type of theme is what needs to be discussed here. Not only which IR is better :)

Thanks for this... I think both versions are worth a try. One has 3,2vf other has 2,9 so I would choose lumileds for start testing. That quad 12v 940 leds would not bring anything special... Well maybe good for some cctv stuff that reaches no more than 50m.

Shipping is a killer... You need to take a bunch of them for free shipping service from mouser.

Edit: 17 PCS of https://eu.mouser.com/Search/ProductDet ... -094006000 qualifies for free shipping and that would be 50 EURO.

But that lumileds is 60 degree beam angle... Could you find 90 degree one please and link here. I can't find it on mouser.

superslack
Posts: 77
Joined: 08 Feb 2016, 23:58
Location: Virginia

Re: 940nm LEDs

Post by superslack » 29 Nov 2017, 01:58

lightmesser, the 90 degree ones are listed https://www.mouser.com/ProductDetail/Lu ... IxBA%3d%3d

I use a T20 that I zoom in and then unfocus until my rifle scope field of view is illuminated. I think the brighter led will give the best results.

The 60 degree is rated at 1190 mw/sr and 90 degree is rated at 780 mw/sr.

lightmesser
Posts: 536
Joined: 09 Jan 2014, 01:19
Location: Eastern Europe

Re: 940nm LEDs

Post by lightmesser » 29 Nov 2017, 10:40

Once upon a time I managed to dedome Osram 4715AS and I did not gain any performance boost which normally happens with most classic leds.
I only got tiny beam projection.

So default 90 degree domed Osram worked the best in aspherical light and that why I know 90 degree should work good no matter for mw rating. What is matter how beam will be projected through optics

Anyone here wants to share expenses on mentioned 17pcs?

Wait a minute...

You already tried it? If you tried please describe performance and your used night vision :wave:

superslack
Posts: 77
Joined: 08 Feb 2016, 23:58
Location: Virginia

Re: 940nm LEDs

Post by superslack » 29 Nov 2017, 14:23

I live in the US so shipping was cheap.

I just reflowed the 60 degree led last night. I am waiting for the driver to arrive to finish the pill. I don't have a dvr yet so there will be no video. I will report my observation, though.

lightmesser
Posts: 536
Joined: 09 Jan 2014, 01:19
Location: Eastern Europe

Re: 940nm LEDs

Post by lightmesser » 29 Nov 2017, 14:45

Observations are fine.

Especially if you have 4715as to compare. Hope you won't forget report :)

superslack
Posts: 77
Joined: 08 Feb 2016, 23:58
Location: Virginia

Re: 940nm LEDs

Post by superslack » 03 Dec 2017, 23:42

Apparently i am unable to reflow solder or something.

I tried 2 on bergquist 80487 stars, but they didn't work. so...no update soon.

Edit: It's a cathode indicator on the bottom of the LED, not an anode indicator :crazy:

lightmesser
Posts: 536
Joined: 09 Jan 2014, 01:19
Location: Eastern Europe

Re: 940nm LEDs

Post by lightmesser » 11 Dec 2017, 22:16

So how we are getting with 940nm led?

superslack
Posts: 77
Joined: 08 Feb 2016, 23:58
Location: Virginia

Re: 940nm LEDs

Post by superslack » 15 Jan 2018, 16:59

I did a little testing. With this 940nm LED set on 15% of 1050ma NANJG driver, the glow is not visible past 12 to 15 ft. However, it provides full illumination for 20 yard shots (farthest I tested). This was using my scopeless Foxeer NW V2 with 50mm F1.2 Treeye M12 lens.

I also tested with 100% of 1050ma NANJG driver on a clear night in the countryside with a new moon. Using my monocular with Night Eagle 1 and 25mm f1.2 yumiki brand m12 lens, I was able to see a house, trees in the yard, and a treeline in front a field clearly. I wasn't able test with my scopeless rig.

Overall I am happy with it. However, for proper testing, I need to make another 4715AS pill with 1050ma driver and compare illumination and visible signature at same power level and then compare to 1.5A 4715AS.

lightmesser
Posts: 536
Joined: 09 Jan 2014, 01:19
Location: Eastern Europe

Re: 940nm LEDs

Post by lightmesser » 15 Jan 2018, 20:33

superslack wrote:I did a little testing. With this 940nm LED set on 15% of 1050ma NANJG driver, the glow is not visible past 12 to 15 ft. However, it provides full illumination for 20 yard shots (farthest I tested). This was using my scopeless Foxeer NW V2 with 50mm F1.2 Treeye M12 lens.

I also tested with 100% of 1050ma NANJG driver on a clear night in the countryside with a new moon. Using my monocular with Night Eagle 1 and 25mm f1.2 yumiki brand m12 lens, I was able to see a house, trees in the yard, and a treeline in front a field clearly. I wasn't able test with my scopeless rig.

Overall I am happy with it. However, for proper testing, I need to make another 4715AS pill with 1050ma driver and compare illumination and visible signature at same power level and then compare to 1.5A 4715AS.


You mean you gotta compare it to 4725S which is also 940nm one? We are comparing apples to apples right?

I will also report that 2 days ago I tried 4725AS in some T20 equivalent light I ordered from Ali for mine newest project(near eye build which is still in developing but I can use it) and I got to say that I had 50 meters usable distance(and slightly more than that) Same camera as yours mate so I really hope you turned camera to B/W settings and now under that B/W settings you have special IR options. Play with that :thumbup:

I drive it at 1.4A(overdriven).

So from your review seems it ain't any better than 4725s

It is also easy to calculate how much would throw in T50 or T67 and behind addon. In T50 with my overdriven 4725S would throw 80-100 meters and in T67 it would throw 150-170 meters.

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