How hard to push XP-G2 R5?

I've got some XP-G2s on the way (XPGBWT-L1-0000-00H51), bin R5. The datasheet lists current flow up to 1.5A at a potential of 3.1V.

I know some of you guys have pushed these LEDs harder and higher. Any helpful links?

Is there any inherent ability in the LED to resist current flow (in other words, I need to add a current-limiting resistor, correct?)

Please bear with me--I'm a Mechanical Engineer and just getting into the "magic blue smoke" part of the hobby. Leave the machining and heat-sinking to me!

I appreciate the help.
jkpq45

Ask vinhnguyen54. He mounts his emitters directly onto copper and has made some mind-boggling achievements.

Like driving XP-G2 at 4A, if I remember correctly...

Wow, he has done some interesting things. Thanks for the ideas!

i,ve read on fnf xpg2 soldered to copper (bare xpg2, no star)can put out 1000lm at 4 or 5 amps.

but i doubt it will last long at those currents.

2,8A on a copper star supposedly works great...

How bright can one LED go? Some of the new flashlights with single LEDs can reach 1000+ ANSI lumens. Can they go much higher than that or would it break the LEDs?

newbie66 said:

How bright can one LED go? Some of the new flashlights with single LEDs can reach 1000+ ANSI lumens. Can they go much higher than that or would it break the LEDs?

Click to expand...

each led has max light output & most common used led's are XP-G & XM-L

xml Up to 1040 lumens @ 10 W

xpg Up to 493 lumens @ 4.9 W

also check this link for more info about LED's http://www.cree.com/led-components-and-modules/products/xlamp

:welcome:

Dr.444 said:

each led has max light output & most common used led's are XP-G & XM-L

xml Up to 1040 lumens @ 10 W

xpg Up to 493 lumens @ 4.9 W

also check this link for more info about LED's http://www.cree.com/led-components-and-modules/products/xlamp

:welcome:

Click to expand...

Oh I see. Thanks for info and link. I'll check it out.

if the xp-g2 was mounted to copper star, it could easily go further ^mA

what copper star are you guys talking about??
led tech.de star that has led sinkpad sitting directly on copper? (afaik they only build it for xm-l).

or just regular star with insulating layer between copper base and led sinkpad?

if you talking about second, than it really depens on insulation, how heat conductive, and thin it is. not material of the base. copper may not make much difference if insulating layer is too thick.

same as if you put a plastic bag over your head, and open window, fresh air wont help you breathe any easyer unless the bag is off your head.

alpg88, your point is well taken. Be careful around plastic bags nonetheless!

alpg88 said:

what copper star are you guys talking about??.....

Click to expand...

+

this kinda thing

oh, how could i forget, the sinkpad.
yes these are great, no doubt,
i wanted to buy few but they have 1000pc min, if i understood them correctly. :sigh: