LD-51 driver for xhp35

mehmeth

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Jun 7, 2018
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Hey guys! First post and am going to be missing a cheap $15 long throw spotlight with a xhp35 and a LD51 driver. I'm still in the design stage and haven't purchased anything yet.

I am stuck on how to wire up the driver .
SPOTLIGHT-- https://www.kmart.com.au/product/led-high-output-spot-light/1706302

DRIVER-- https://m.gearbest.com/led-accessories/pp_391948.html

The housing is plastic so I think I need to run a ground wire through out the housing for this to work but unsure what goes where on the driver board. Any help appreciated.
 

DrafterDan

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Jul 28, 2013
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Phoenix, AZ
welcome, that's an interesting modding project.

On drivers, they are meant to be fitted into a pill, to house both the driver and LED board (MPCB). There is a grounding ring at the outer edge of the driver, you can just solder to that.

Of course, you are going to have one (okay, two) large challenges. The XHP35 is a pretty serious LED, and will generate a lot of heat. What are you thinking of to handle that? Second issue, While four C batteries are indeed 6V, they won't have the guts to properly drive that LED for very long.
 

mehmeth

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Jun 7, 2018
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I am going to run 2s2p 18650 with about 6ah. A hobby style lipo balance charger will be charging them. A heatsink is going to be installed and if need be a small fan or more aluminium around the inside edges.

Just unsure what the two wires coming off the driver do.
 

light-modder

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Jul 15, 2014
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Kansas
The link says the driver is discontinued. The wires go to the led and are already installed on most drivers so that will apply to others as well.
 

mehmeth

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Jun 7, 2018
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I have pulled it apart and it's a CREE LED. Could I get an id on it from the pics. And it also has a pill installed. Looks like it could be a nice build.
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9c41db176bf1dd5600a8e433aef1651d.jpg
 

HarryN

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Jan 22, 2004
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Pleasanton (Bay Area), CA, USA
The housing is pretty - that part is good.

The thermal path is about as terrible as a person could possibly come up with. It is almost like they tried to fail in every possible way, but I guess you can build a completely new thermal path for it. Perhaps mount it on a heat spreader with some fins and a fan.

If you can, move the driver away from the heat of the LED into another portion of the housing if possible. Drivers are mounted in "pills" because of space constraints - not because it is a good idea. Basically the pills are based on the idea that both the LED and driver need to get rid of excess heat, so why not use a common thermal path. With a plastic housing, there is essentially no thermal path, so separating them is a good idea.

As far as the specific LED, not sure, but the star mount board is a pretty handy format. Try to find one that has a small surface area so that it has a high surface brightness. It is a 3 watt version. Doesn't have to be cree - just get a really high brightness - small surface area one for a thrower.
 
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