Heatsink For 100w Led

Uh... it's the site that he linked to.

I believe he may have been wondering at the implications of the sites choice of name as inferred from the actual stories of Ali Baba.

Ah. My bad.

Here is the new link

http://i41.tinypic.com/2q3tbau.jpg


http://tinyurl.com/6ogul83




This post has been edited by serein on February 08, 2012 05:26 pm

The size of the heatsink, in conjunction with it being aluminum (as opposed to copper) are pretty modest... but those fans look like they would move a lot of air.

It will be quite noisy, but I would think that it would work fine for a 100W unit.

I'd consider that heatsink OK if your ambient temperature always remains below 30°C, the fan is always on with the light, & it doesn't get plugged with dust.

The problem with those high power LED light engines is that you never get proper data with them, so you don't know the maximum allowable case temperature or the thermal resistance of the LED unit.
Maximum allowable junction temperature for white LEDs is 160°C. This means that your heatsink temperature should never exceed 100° under any circumstances, & this assumes the LED assembly is properly mounted.
Before mounting those LEDs onto a heatsink, I always hand lap both LED & heatsink until they are perfectly flat. It's amazing how uneven those surfaces can be.
I try to keep the temperature of the surface of the light emitting area under 125°. Under 100° preferrably.
The cooler you keep them, the longer they last.

And the brighter/more efficient they are.

Thanks people

I was wondering what would be the best specs for the 100W Aluminium heatsinks

For example http://i40.tinypic.com/v7428j.jpg

the size,dimension,thickness and do they weigh much

A supplier said that the shipping would be higher due to the weight Is that so ?

WE can't tell you much more unless we know your intended operating environment, as this will make a big difference in heatsink requirements.
However, used with a small fan, half of one of those heatsinks would be enough for indoor use where ambient temps never exceed 30°C.
Those heatsinks probably weigh in the neighborhood of .75-1.1kg each.

Alright I have checked the ambient temp and it came to be 24.8 Celsius.

The reason I asked about the size and dimension for the heatsinks is that some supplier are asking those details.

I do thank all of you for your consistent help and information.

I guess I am getting crazy for the heatsinks

Depending where you are in the world I would recommending designing to allow for 35C ambient temperatures or higher. You may be measuring 24.8C now, but that doesn't mean it won't reach higher on a hot day. Bearing in mind that the device will heat up the air around it (exactly how much depends on air flow), it's probably best to design for 40-45C air temperatures.

Dimensions aren't everything, however. Fin density has much to do with it, as does airflow. Heatsink capacity will vary widely if these two conditions vary.
Given the high cost of these LEDs, it's better to use more heatsink than you need. You can never use too much.

Hey Everyone I have one 100W LED and another 70W LED.

70W has these specs

Power: 70W (real 70W, 70W lose ten times)
Input voltage: 32V-36V
Input Current: 2100MA
Luminous Flux: 6300LM

100W has these specs

Input: AC100-240V
Output voltage :30-36V (tag labeled 36V)
Output current: 2800mA
Luminous flux :8000-9000LM
Voltage :30-36V
Current :3000-3300mA

I have only one driver which I got with the 100W led it has these specs

Output voltage: DC30-36V
Output current: 2800mA
Power factor greater than 0.85, the ripple is less than 100mV
All circuits are EMC


Will this be able to work with the 70W LED ?

thanks

This post has been edited by serein on June 15, 2012 02:21 am

No. Those are constant current drivers.

2.8A * 34V = 95W > 70W.

Damn have to get another driver board. Thanks Ice-Tea

You could use that board with the 70W LED, but you will need a bigger heatsink & the LED will lose about 20% of it's lifespan.
Changing the value of the current sensing resistor on the driver board to change it's output current is another option.

Hey people

have these quick questions about the 100W LED.

is it okay to use a 70 degree thermostat with the 100W LED.

also another dumb question I have two fans which I am planning to mount on the aluminum heatsink.

I was wondering which sides of the fan should be connected.

thanks

Hi serein,

I'm working on something similar and my intention is to use:

http://www.arctic.ac/en/p/cooling/cpu/57/.html

to cool a dimmable 100W LED.

Since I want it to be as quiet as possible and it will rarely be used at full power I found a regulator for the fan:
http://www.ebay.com/itm/CPU-VideoCard-IC-F...=item27ca8eb890

The price for the heatsink is about 30euro.

Would this work for you?

I also intend to place a thermostat next to the LED if anything fails, it will just turn off:
http://www.ebay.com/itm/1Pcs-KSD9700-Bimet...=item43b1d7fcf8

hmmm ...
the last reply was about 7 months ago.
the thread is about a year old .
you might want to repost with a new topic .