Any good?

[aquila]

Does this LED produce anywhere near the stated lumens?

http://www.dealextreme.com/details.dx/sku.39999

 

[Noctilucent]

They're a bit hit-or-miss. Not to mention.. they get *seriously* hot. We ordered two of the 100W ones, but I reckon the 25W will still need active cooling.

As for the hit-or-miss part.. one of them gave about 7000lm, the other 6200; both short of the 8000lm claimed.. this was using the supplied driver (oh, yes, you need an uncommon driver), so it might have been that the claimed lm was for the max rating. Of course you also have to factor in the lens (unless you want the near-lambertian lighting)

I'd put more faith in the Bridgelux ones:
http://www.newark.com/bridgelux/bxra-c2000-00000/cool-white-led-array/dp/45P5611
http://www.newark.com/bridgelux/bxra-c2002-00000/high-brightness-led-arrays/dp/60R6541

They cost about the same.

That said... see the above... it's a heck of a light source, it runs so hot you'll likely need active cooling, you'll probably want to get the lens and on top of that, you can't exactly just hook it up to what you might use to drive a bunch of 3W star emitters. What are you planning to use it for? Odds are there's more appropriate alternatives.

Edit: Aha.. I knew I saw a thread on this subject before.
http://www.candlepowerforums.com/vb/showthread.php?t=283741 - 6000 lm single LED ??? Is it true

 

[aquila]

They're a bit hit-or-miss. Not to mention.. they get *seriously* hot. We ordered two of the 100W ones, but I reckon the 25W will still need active cooling.

As for the hit-or-miss part.. one of them gave about 7000lm, the other 6200; both short of the 8000lm claimed.. this was using the supplied driver (oh, yes, you need an uncommon driver), so it might have been that the claimed lm was for the max rating. Of course you also have to factor in the lens (unless you want the near-lambertian lighting)

I'd put more faith in the Bridgelux ones:
http://www.newark.com/bridgelux/bxra-c2000-00000/cool-white-led-array/dp/45P5611
http://www.newark.com/bridgelux/bxra-c2002-00000/high-brightness-led-arrays/dp/60R6541

They cost about the same.

That said... see the above... it's a heck of a light source, it runs so hot you'll likely need active cooling, you'll probably want to get the lens and on top of that, you can't exactly just hook it up to what you might use to drive a bunch of 3W star emitters. What are you planning to use it for? Odds are there's more appropriate alternatives.

Edit: Aha.. I knew I saw a thread on this subject before.
http://www.candlepowerforums.com/vb/showthread.php?t=283741 - 6000 lm single LED ??? Is it true

I´m planning on using it as a fixed light, so flood is good.

 

[Noctilucent]

I´m planning on using it as a fixed light, so flood is good.

Yeah, but for what purpose? I've seen a few posts here from people who want to use these high powered LEDs for workspace lighting.. and invariably the suggestion they get eventually - and which I agree with - is to get a fluorescent tube instead.

Just want to check that you're not just buying an LED just because you can.. and end up with a lighting assembly that's sub-optimal for the purpose and more hassle than it's worth