Need some help

6 posts / 0 new
Last post
christoph
Offline
Last seen: 6 hours 30 min ago
Joined: 10/06/2015 - 20:08
Posts: 63
Location: earth
Need some help

I am rebuilding some lights I modded 12 years ago and have had some setbacks. I bought drivers and led’s and thought I matched them up correctly however the two drivers below and the leds didnt last more than a few seconds. The drivers appear to still be able to power some old luxeons I have sitting around .These are the drivers and leds after the multi mode one fried the led I went with a single mode buck the light is a 4 D cell mag and it will be running three 26650’s(protected) if someone could let me know where I went wrong I would be grateful.
TIA
Chris

17mm 1A or 2A Buck Driver – 2.7V – 14V – 1 Mode – Output Current: 2A BD-BUCK-17MM-1M 1 $4.99 $4.99
CREE XP-L HI V2 1A LED on Noctigon 16mm MCPCB XP16-XPL-HI-V2-1A

LD-29 2.8A 1 or 2 Cell Driver – 20.5mm LD-29 1
CREE XM-L2 U3 3D LED on Noctigon 16mm MCPCB XM16-XML2-3D

Chris

Lightbringer
Lightbringer's picture
Offline
Last seen: 59 min 44 sec ago
Joined: 08/30/2016 - 14:12
Posts: 9500
Location: nyc

Wellp, for one thing, a “1 or 2 cell” driver wouldn’t fare so well with 3 26650s powering it.

09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

christoph
Offline
Last seen: 6 hours 30 min ago
Joined: 10/06/2015 - 20:08
Posts: 63
Location: earth

Yes I kinda realized that after it fried the led Sick but what about the buck driver?

Chris

Sirstinky
Offline
Last seen: 7 hours 53 min ago
Joined: 11/02/2018 - 17:07
Posts: 213
Location: Vancouver, WA

It depends on the voltage handling ability of the buck driver. Most buck drivers for flashlights are good for up to 3 li-ions, but some cam only handle 2. If you’re driving a 3V led I’d imagine you need a driver that can handle 12.6v max input and 3v output.

christoph
Offline
Last seen: 6 hours 30 min ago
Joined: 10/06/2015 - 20:08
Posts: 63
Location: earth
I realized my mistak on the first driver however I thought this second one should have worked.This combination lasted about 30 seconds

17mm 1A or 2A Buck Driver – 2.7V – 14V – 1 Mode – Output Current: 2A BD-BUCK-17MM-1M 1 $4.99 $4.99
CREE XP-L HI V2 1A LED on Noctigon 16mm MCPCB XP16-XPL-HI-V2-1A
Chris
thanks for the responses so far. If someone has favorite combo they would like to recommend I’d be Big Smile

Chris

Sirstinky
Offline
Last seen: 7 hours 53 min ago
Joined: 11/02/2018 - 17:07
Posts: 213
Location: Vancouver, WA

You wouldn’t be driving that xp-l that hard at only 2A. That emitter can take 6A with good heat sinking. It would still be a lot of light, just not what it’s capable of. The other issue is the driver size. Aside from this one: 17mm buck driver I can’t think of any 17mm buck drivers to push the xp-l hard. It’s put of stock (you need to request for Richard to build you one since they are madee to order). Yes, it’s expensive, but this is my recommendation if you can’t fit in a 20mm or 22mm board, which you can get for cheap overseas.