Which heatsink on 50W led chip

Hey guys i need your help i have 50W chip and i need any active heatsink(i guess normal heatsink for CPU). But i dont know how efficiency heasink i need i was looking ebay and some chinese shop and i thought if somethink like this would be enought for keep it at least 18 hours http://www.dx.com/p/professional-cpu-heatsink-cooler-cooling-fan-silver-126182#.VAY66npvG5g or please tell me any which exactly you would choose. Important is efficiency/quite/price . Thank you

Will handle up to 100 watts.


http://www.amazon.com/gp/product/B00606OHQQ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Well but 100W CPU. I thought that i big different between 100W CPU and 100W LED - I am i wrong and its same ?

A watt is a measurement of heat dissipation........I use these at 60 watts and they work great.

Aveee said:

Well but 100W CPU. I thought that i big different between 100W CPU and 100W LED - I am i wrong and its same ?

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A watt is a watt is true, I won't bring up our countless discussions on that............but your right in a certain context as SDS pointed out before in his thread; A cpu's heat dissipation needs vers led/cobs is different. Regardless, it's always a good idea to "over-build" on the cooling rather than to follow a general cpu watt rating====== no fried eggs grower

FranJan said:

http://www.led-heatsink.com/LED_heat_sink_calculation_simulation_thermal_design.html

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how many uneducated people do you think even REMOTELY understand this! Great read for those of us that do!

thank very much to all of you

Leds are a constant load (100%) for the Heatsink over a long time, 12 to 20 hours.
CPUs normally run not on full Power, 40-60% is here the workload weighted over time.
full power can be seen by numbercrunching or videorendering.
for CPU cooler simple half the given heat dissipation.

Aveee said:

Well but 100W CPU. I thought that i big different between 100W CPU and 100W LED - I am i wrong and its same ?

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would these LEDs actually burn themselves out or what?
i ran a 20w UV LED with heatsink/fan in a plastic tub thing and the fan stopped working - but, the LED was fine. ran it on and on still.. would a 30w - 50w actually die or would it just get unmanageably hot running for an extended time with no heatsink?
in a weed grow you could harness the extra heat.
i want to know because of the difference in price and loudness of a CPU cooler vs a north bridge cooler like the one that shipped from china with my 20w LED. it was quieter, but broke and i dunno about it's ability with like this 50w i have right here.. it gets very hot very quickly like a CPU... also - you can grab emitters for like $3, but a big fan doubles that...
one idea i have is to use 100w IR lights outside!! totally invisible, but keeping some lights going into the night.. in that case though again - what is really needed as far as heatsink/fan??