LED diode on the C8 Flashlight

Please help me, or give me an idea!
I have several C8 Flashlights with a tactical switch where I have infused IR 980nm (invisible).
Can you tell me where to insert a small LED to light when the C8 is turned on?
I’ll make a little hole or on the switch itself …?
Please study or give me an idea.
waiting for your reply!
Thank you! :-\

The easiest is in the head. You can wire the small led (i.e. a red 3mm led will work, drill a 3mm hole halfway the head next to the reflector) parallel to the main led, but wire a 2 kOhm resistor next to the 3mm led to reduce the current.

But isn’t there just 1,8 Volts over the main IR LED?
That may not be enough to light up the indicator LED.

Very good idea! I do not know, I hope there will be enough power to shine at least a little.
Do you mean here? Is it good?
image C8 LED 3mm

Inside, I have places up to 8mm.

Can I find some small diodes with the enclosure together, and that it can stand inside?

Thanks for wanting to help me! :partying_face:

the main LED should be controlled with AMCs on a driver?
so simply wire the red led with resistor on the MCU output or AMC input

Yes, I have a driver!
I think it’s clear to me that it just remains that I try to see how bright it will be.
And I’m afraid if that little diode breaks up, it does not make a short battery connection?


That’s why it’s good if I find a small diodes with a little casing to fit inside and protect that diode so that it does not get into the water and does not break.!

a small diode wont break, simply glue it in with clear silicone or 2 component glue so that it does not stick out of the head

Okay, so it’s good to just put a diode into the hole and put glue.

I was thinking of something like this (because it is more beautiful) but it is not mandatory.

Instead of compromising the light body (no matter how good you seal it up its never going to be as waterproof as a light without a hole in it) why not just use a lighted tail switch?

Tail switch illuminated = flashlight powered off, tail switch off = flashlight powered on

I know it’s not good to make a hole. But this is an invisible IR and it is not known when it is turned on and when it is not. You see only in the full darkness (very, very little). And if it remains lit, it will consume and will destroy the battery. So I’m looking for a solution that can be seen when it’s turned on. So I’ll have to make a hole, (I do not have another option) …

- On the IR diode I only have 1.5 volts! I tried a small red LED (3mm) directly connected, barely bright.
Connected directly without resistors. I hope I will not diminish the power of the IR diode?

- If I connect directly to an IR diode, it’s the easiest way for me to connect here (I do not need to add an extra wire). I do not know whether I need to put some resistor (because the voltage is 1.5V very weak), and there are some LEDs that can operate at a lower voltage (1V-1.5V)?
THANK YOU for helping!

You can use your phone to check if the IR led is turned ON or not. Phones camera will pick up that light.

I know about it … but I can not turn the phone on every time just because I see whether it’s turned on or not!
That’s why I thought I’d put one LED in!
Please reply to the previous message!
Thanks a lot to everybody!

Did you read post #9 ?

a lighted tail switch seems like the easiest solution.

But I do not know how that would look like it? Then all the time the lights would light up when the lamp was turned off! Am I right or wrong?
Then perhaps it’s a better solution to make a hole…!!! :cry:

If you drill a 3mm hole at the position in the picture, you can push in a red 3mm led from the inside (it will have enough space there to clear the reflector). The thickness of the wall there is more than the length of the led so you can fix the led and waterproof the hole by filling the rest of the hole from the outside with UV-curing glue or two-component epoxy like Araldite.

Jerommel had a valid point that a IR led has a very low voltage, so if you wire the red indicator led parallel to the main IR led, the red led will probably be under its Vf and not light up. So you may have to derive the power for the red indicator led with thin wires directly from batt+ and ground on the driver (do not forget to wire a resistor in series with the led, start with 1 kOhm and adjust brightness to taste from there).

Very nice and interesting! Very good and detailed answer!
I like this one! I just did not manage to see how the bright LED on the switch! How it looks or where it would be inserted!
If not this drilling solution is the best!

  • I’d better connect the red LED directly to IR. But if there are no LEDs that would do a little better with 1.5V then I will have to connect directly from the battery!

Thank you very much, everyone for these ideas! in the LED switch I do not know what it looks like (I did not see it), but it looks very good with a hole. If you have some idea later, write something here, please!
I want everyone happy holidays and a happy new year 2019!

Got any ribbon-cable or other thin thin wire? Pull off 2-strands. Solder to the LED you want to use, use heat-shrink on individual leads to keep them from shorting. That way you can bend the LED’s leads to get them out of the way after the LED’s mounted in the hole.

On the opposite end, more heatshrink all-around, solder a 1/8W resistor of the right value. Then just tack-solder the leads to wherever on the driver-board. Of course, make sure you get the polarity right, else it ain’t gonna light up at all.

If you want to, use hotglue to hold the LED in the hole, and to tack the wire to the inside of the head. That stuff’s like meltable duct-tape…

why not use 850nm IR ? you see if it on/of and more bright for nightvision ?

Nice answer! I like it, and so I’ll do it.
I need to make sure that I have enough places inside the lamp. I’ll look for some glue that I can put on ice diodes, and that it’s a very good adhesive to the Aluminum LED.


I hope it will be good … if I do not buy something else where it is very well glued and water and moisture can not enter!
THANK YOU
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  • I want this 980nm.