LEP Modul

We bought 3 LEP Moduls from Ali
and do some tests.

It is written in German,
but datas are international:

Thanks @ sma and Andi

Regards Xandre

Nice work! Any ideas how to proceed from here?

that looks cool

Can those modules be driven with the same drivers we use for flashlights? I know that the voltage is a bit too high for 1 li-ion, but apart from that, are lasers any different from leds to drive?

Cool :sunglasses:

I love to buy one of those and make an lep host. Maybe one day….

Yepp
the same drivers but I am not an expert .
2 S is good,the LEP needs 4 Volt.

Regards Xandre

We bought modules without a pre-collimator lens on the phosphor. This makes them suitable for use with a reflector. Because of the small size of the emitting area (0.25mm2 i.e. one quarter of the size of a white flat1) you need a precise reflector to really make use of theses modules (electroformed reflectors and glass reflectors are probably needed).

The luminance of these modules is similar to that of a white flat LED with wavien collar. The benefit is that they are easier to use in a flashlight because there is no collar to align and large metal precision-reflectors are cheaper and much lighter compared to large glass precision-aspherics.

We use this driver for testing:

and it works well
max 4A and the phosphor is still alive
but we made only short tests max 30 seconds @ 4A!

Most important is the heat transfer.
We pressed the modul in a cooper “heatsink”

Without heatsink the modul reached
100 degrees @ 2,5A within 4minutes

Regards Xandre

Two words. Awww sum :+1:

Neat stuff! This is probably the diode inside those modules NUBM08 455nm 4.3W Laser Diode - DTR's Laser Shop

The bottom of this page gives instructions on driving a laser module. I’m not sure which ones are mandatory and which are best practice for longevity. Laser Drivers - DTR's Laser Shop

sma made some test about fv

3.0 V -> 5 ma -> 0.03 lm
3.2 V -> 110 mA -> 0.3 lm
3.5 V -> 700 mA -> 120 lm
3.7 V -> 1.5 A -> 340 lm
4.0 V -> 2.8 A -> 470 lm (kühler) coolwhite
4.0 V -> 3.1 A -> 510 lm (wärmer) get warmer

Regards Xandre

Thanks for those links, that shop gives some nice compact basic information on how lasers must be driven.Although just as leds they must be current-driven, they are much more sensitive, spikes and inductances must be avoided, even when setting a current a dummy load must be used because turning a pot can damage a laser :open_mouth:

I have a W30 that I have increased the current to 3.5a from 2.5a anything over that they die.

Ever try a collar?

Is a collar ever used on a LEP flashlight yet? Since the LES is so tiny, to get a significantly improved luminance the optical quality of the collar must be very good, and the positioning in all 3 dimensions extremely precise.

If you chop the front off a w30 the cone of light coming out is 68° with that number you can work out the focal length needed for a certain sized lens. Not sure of other but w30 has a small secondary lens close to the phosphor. I personally don’t think a single optic is any good and the secondary can be mirror or lens. S9 the short answer no but I have tried other lens.

This shows the potential of LEP chopped W30 (right) cant remember the exact lens but probably 150mm. On the left is a maxabeam.

Looks impressive, like better than the Maxabeam, but I hope you understand we want more information on this mod, and better beamshots :nerd_face:

I can’t stress what djozz said any more. We need pics and details!

From what I understanding, you cut the stock bezel off a W30, measured the emission angle through it’s first lens at 68°, then used a ~150mm lens with the proper focal length to utilize all of the emitted light and machined a custom bezel.

We are going to test wavien here
https://www.taschenlampen-forum.de/media/img_20211120_035033-jpg.35132/full

This is without wavien.

Beamsize vs finger in about 1,4meter

https://www.taschenlampen-forum.de/media/img_20211120_034116-jpg.35131/full

Regards Xandre