Question about Cree UV LED

[Erasmus]

Hi there,

I still have one Cree UV LED left from the small batch I shared with CPF'ers some time ago. It's a Cree UV LED in an XR-package, the same package as the well-known Cree XR-E. Did anyone ever test voltage vs amperage? Would it be safe to direct drive this emitter from a 10440 320mAh li-ion cell?

Cheers!
Raf

 

[darkzero]

I've done two both driven at 1A








Another at 720ma

 

[DaFABRICATA]

I used mine on a Bug-Out-Gear Drop-in
Think that is easily running at 1A

I also swapped one into a Surefire E1B-Backup.

Both work great with zero problems

In Fact my Avitar is one of them!


BTW...Very Nice Lights, DZ!:twothumbs

 

[rantanplan]

I had ordered three pieces from led-tech.de some time ago. According to this dealer 350 mA is nominal current, 700 mA is fine with appropiate cooling. IIRC I couldn´t find a proper spec sheet for this "XR-E UV".

I took some measurements back than, but can´t remember the numbers . Vf was at least in the upper range of regular white XR-Es, so a direct drive from a "weak" 10440 should be fine. A 10440 would be suffering most in this setup I guess.

I had a couple of old parts laying around, so this light was the result: Not totally useless, but of less use :

3x Cree XR-E "UV" @ 700 mA, Shark, Mag2C, 2x 18650 ....

 

[Erasmus]

Thanks guys, I tested with a 4.05V (open circuit) 10440 cell and the current was 480mA. Tomorrow I have fully charged cells, so then I will check the current again. I guess it won't exceed 700mA, so it's just fine. The Cree is mounted in a Fenix L0P host, tomorrow I have to cut down a McR-17-XR and then I can make some pics The world looks way cooler with UV light!

 

[Erasmus]

My thoughts are confirmed I finished modding a Fenix L0P to a direct driven Cree UV LED (optics : cut-down McR-16-XR) running on a 10440 li-ion cell. I did a few measurements for the first 10 mins of runtime :

Time - battery voltage open circuit - current draw
00.00 - 4.17 - 700 mA
00.05 - 3.90 - 600 mA
00.10 - 3.85 - 530 mA

Thanks for your assistance guys, I'm very happy with my small UV light

 

[nailbender]

I have been running one in a fenix p1d for quite awhile with good results

Dave