CREE MK-R J2 build

Hello everyone.

Im currently testing another custom build i've recently finished in the lathle, its a MK-R J2 driven by a h6cc from taskled, im driving it at 1200 mA so it should do about 1700 lumen and using a 4º optics.

I dont have any underwater shots, but i'll love to hear some of your opinions.

Cheers!!

Hi MAD, im working in a project with the same led.
At this moment i have a lot of leds burns. I connecy the cnc protos directly to 12v battery car, so their live are short.
What driver will be the best?

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Nice machining!

Which refelctor or optic did you use?
What are the inner and outer diameter of your lighthead?

I have an MKR j2 also running from the h6cc. I ran it at 1.25 for a while then got bored and took it up it 2A.

2amps? and how does the led behaves driven at 2 amps?

MAD23 said:

2amps? and how does the led behaves driven at 2 amps?

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Brighter

Gtamazing said:

Brighter

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Thanks mr obvious, i meant how it behaves in temperature etc...

It gets hotter.

Hi guys, ive problems with the optic and his holder. Could ypu help me? Whats the better way ? I have always 4 squares at light focus.
Could you help me?
Holder and optic dimensions.
Thanks.

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Packhorse said:

It gets hotter.

Click to expand...

Much hotter? or using it underwater is safe for the led?

MAD23 said:

Much hotter? or using it underwater is safe for the led?

Click to expand...

Heat sink in contact with water should be fine, better have a big sink on dry land.

Four squares would be perfect focus with a good aspheric lens.
Now you need to de focus it just a bit to blend the image

MAD23 said:

Much hotter? or using it underwater is safe for the led?

Click to expand...

Well now that the short answer are out. At 1.25 it made next to no heat even when on for a long time. At 2a It got warm. I ran it for 20min at a time. Have no way to quantify your question I can say it makes less heat than an sst90 at 8.4A.

Here is the build.

Gtamazing said:

Well now that the short answer are out. At 1.25 it made next to no heat even when on for a long time. At 2a It got warm. I ran it for 20min at a time. Have no way to quantify your question I can say it makes less heat than an sst90 at 8.4A.

Here is the build.

Click to expand...

Ok, so it should be ok at 2amps using it with a good sink.

Any guess on the Lm figures at 2 amps or more?

MAD23 said:

Ok, so it should be ok at 2amps using it with a good sink.

Any guess on the Lm figures at 2 amps or more?

Click to expand...

No idea on the lumens.

MAD23 said:

Ok, so it should be ok at 2amps using it with a good sink.

Any guess on the Lm figures at 2 amps or more?

Click to expand...

As you increase the current, the heat dissipation increases and the efficiency decreases. These are rated for 1.25A maximum. I suspect you will get about 50% more light compared to 1.25A. It will probably burn out the LED much faster. Solution: use multiple MK-R chips at 1.2A and get about 1500 lumens per chip!
http://www.cree.com/~/media/Files/C...d Modules/XLamp/Data and Binning/XLampMKR.pdf

I tested the MK-R at 2Amps at it gets VERY hot, even in underwatter conditions i dont think its safe to dive with a primary light like that... so now i'm testing a MK-R dedomed version

Codiak said:

Four squares would be perfect focus with a good aspheric lens.
Now you need to de focus it just a bit to blend the image

Click to expand...

Thank. I have a solution.

Yes, i know it's a big bump,. but where does one get hold of these J2 leds?

Cree.com does not have it :/

ozelot said:

Yes, i know it's a big bump,. but where does one get hold of these J2 leds?

Cree.com does not have it :/

Click to expand...

Hi ozelot :welcome:

Try Mouser Electronics.