16mm star for IR (infra red) illuminator. Help wanted.

Dear BLF members,

I can not find 1W(single IR led) IR 850 (infrared) on 16mm star anywhere…

So if you know where I could order them it would be much appreciated.

There are lot of them on 20 mm base but not on 16???

I can not find them on 16 mm star anywhere, and 16 mm is most commonly used for P60 drop ins so this is really strange…):


Do you maybe know what is maximum drive current for this babies?

I need that for gen 1 night vision device so it must be brightest possible.


DX has bare 5W IR emitters as well as 1W and 3W emitters on 20mm boards. They also have the 16mm boards for mouting the emitters but in a 65-pack for $6.29.


A cheaper option is to buy a 5-pack of cheaper LEDs already mounted on 16mm boards and then replace the LEDs yourself if you only need a small quantity:


These solder on easily without reflowing like you would with a Cree emitter...

Alternatively, if you only need a single P60 drop-in, you can buy that as a ready-to-go unit:


The leads on that particular LED package are about 16mm wide to start with - you need to cut them shorter to fit in a 16mm form factor. The LED is also quite tall, so if you mount it on a thick PCB, chances are the reflector won’t screw on to the P60.

My recommendation is to get some Arctic Alumina epoxy and glue the IR LED in place, like so. You need a thin layer of epoxy between the metal pill and LED base, otherwise you’ll get a short circuit and you’ll blow the LED as soon as you turn the flashlight on.

If you want to go as bright as possible with a single LED, get your hands on an Osram SFH4715s (850nm) or SFH4725s (940nm) infrared LED and mount it on a Cree XP-G MCPCB. I’m using the 940nm version on a homemade 16mm FR4 PCB for my TV-B-Gone flashlight project.

I would stick with 850nm unless you’ve tested 940nm & its shown to work well with your gen I nightvision.
Gen II & III response cuts out before 940. I’ve read an extended range is possible with some gen I.

Maybe a layer of Kapton tape? Frown That might be thinner and offer more protection than a thin layer of epoxy?

Probably not a bad idea - lay down a bit of kapton tape, then a dollop of AA, then mash the LED down hard on top of it.

Before I start my apologize for late reply,

Thanks on help guys...

Well i need single 1W IR 850 16 mm base or complete drop-in. As you all pointed out there are plenty of 3W and 5W drop ins but not 1W...

keltex78 it seems that i can not find 1W 16 mm IR 850's already mounted on 16 mm stars on DX? I was searching for half an hour and nothing? Your link for this is pointing on 16mm stars(thanks for this I have it in option).

gmarsh thanks on very nice idea... Very nice explanation how to mount it without star(led pcb)... So you recommend Osram SFH4715s (850nm)? Would you be so kind and tell us what is maximum drive current for this 1W IR's? I have few AMC 7135 0,7A drivers... Will they suit for them or for those cheaper ones from DX?

Helios I would also stick to 850 because they seem to be brighter than 940, although plenty of people claims that 940 is less visible(or completely invisible) for game observation.

Why I want 1W 850 IR? It works best with aspheric

Why I want brightest possible? It will throw further...

Any of your experience with this type of modding especially max drive current(most suitable drivers) for this babies would be much appreciated.

Noctigons and Sinkpads would probably give the best from this IR's but they don't have such pcb's.

Artic alumina(i have it at home, and used it to made few drop ins in vinhnguyen style) is great idea but 16mm star mounted IR that lays pressed on artic silver 5(or better thermal paste) seems like most logical choice for me at this moment. In fact I can use AA on 16 mm led PCB if I will not find 16 mm IR mounted ones :)

After you apply artic alumina there is no returning back. It is concrete solid. Imho even more solid than solder.

Any good and reliable source for this Osram SFH4715s (850nm) ones?

I was just searching for what DX had for IR emitters. To me, it looks like your only option (at least from DX) would be to buy a cheaper white emitter mounted on a 16mm board remove the white emitter to solder your own IR emitter on the same board. I'm trying something similar with a UV emitter to make my own drop-in.

I understand what you are saying about needing the 1W (single emitter) unit to use with an aspheric... I'm curious to know how well that will work!

Friend you don't need to be curious because it works excellent! Especially with bigger aspherics. But it all depend whether you need long range illumination or not... For close encounters P60 reflector light + 5W IR would be the best.

Could someone kindly tell us what is maximum drive current for this 1W IR 850's and recommend suitable drivers?

But I think experiment will be necessary for brightest IR configuration possible, and since most people does not have night vision device and they are not modding IR's I understand lack of data on this type of modding...

The maximum drive current for that chinese 1W LED is about 0.7 amps, assuming a 1.4-1.5V forward voltage. A dual AMC7135 driver is your best choice for it.

For the maximum IR light output possible, I recommend SFH4715S - make sure you order it with the S, as it’s the dual series die version with twice the light output. The LED is rated at 1A forward current, a 3*AMC7135 driver will output 1.05A which the LED will certainly handle. A 4*7135 driver (1.4A) should work reliably if the LED is adequately cooled, on a good XP-G MCPCB you shouldn’t have any thermal problems.

The SFH4715S can handle twice the current (one doubling in light output) as the chinese LED, has two dies versus one (doubling the light output again) and I imagine the LED is at least twice as efficient. So I imagine you’ll get 8-10x as much light out of the SFH4715S versus your 1W chinese LED.

Excellent and superb advice! 8-10× more light is so fascinating that you hooked me on...If I will manage to made at least twice as bright over the regular 1W IR 850 I will have to repay you somehow :)

I just got to find that SFH4715S somewhere. If someone find vendor with international shipping please post here.

This will give you a bunch of electronics distributors stocking the part, pick one in your part of the world.


It seems that I can not order any SFH4715s.

I will be stuck with China ones...

Anyone tried to de-dome IR's?

I don't think the Chinese IR emitter have domes like the Cree emitters. I think it's just a protective plastic bubble...

mouser has the 4715s and they also have the berquist stars for them. The 4715s will not go on an xpe/g sinkpad because the 4715s and 4725s have the thermal path and anode connected. I blew up a few before i figured it out.

I have not found the need to dedome the osram IR emitters. They put out enough light to illuminate way beyond sensible shooting ranges when used in IR illuminators for nightvision scopes.

i’m actually starting a project a bit similar to yours, i’m building ir light for my camera, which is old sony 8mm 0lux cam.
it has 2 small 850nm leds build in, but i also build array from 13 0,2W 10mm leds. night and day difference.

now i’m building 10w ir light, i’ll use 2 5w ledengin 850hm leds. and 38mm 14* lenses, it’ll run on 4 18650 cells.

so far i got most parts and as time allows start the build, will make a new thread than.

very cool project. I will keep an eye on your progress for sure. The Vf is very high on that emitter. I will have to look around for a boost driver to use in a dual 18650 light. this emitter might be just the ticket in a slight defocused aspheric gun light application.

At what point does one have to start being concerned about IR safety ? a single oslon is rated at 800 mW/sr of radiation. When used to create a flood illuminator i guess its not going to be too dangerous but I imagine i would not walk in front of it if it was focused with a reflector or a lens … what kind of precautions do you guys take? there seems to be very little in way of guidelines on the net.

by the way, why are reflectors way less common in IR builds than aspherics or lenses ? Its the other way around with flashlights.

Only reason I can think of is the oslon emitters half angle which favors aspherics, but is that all or is there some other reason ? are the losses for reflectors/aspherics somehow different with IR and visible light ?

I bought a oslon ir-emitter at rs-online together with stuff from work. Another one I bought from mouser, they ship worldwide to anyone but have high shipping costs (but it is there in three days :-) )

Guys I will just say that you can not buy China 16 mm 1W 850 IR's mounted on 16 mm pcb's anywhere...

They only sell 20 mm ones...

4715s really looks good but Even if I order 10 pcs and pay more than 100$ for them I can bet that I will ruin at least 2 of them...

I seen that Djozz made one 4715s on xpg sinkpad so I guess it would work.

I have XPG noctigons and now some guys says 4715s can bee mounted and some says it can't.

4715s is to expensive for experiment.