Author Topic: LED Heatsink 10W?  (Read 11765 times)

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Offline BigBrother

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LED Heatsink 10W?
« on: July 26, 2012, 09:27:06 AM »
I want to use these 10W LED lamps but I'm not sure how big of a heatsink I'll need or if I can find one that'd be best for use as/in a lighting fixture.

budget: 10$/ea (I need 4, maybe 5)

Offline Short Circuit

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Re: LED Heatsink 10W?
« Reply #1 on: July 26, 2012, 10:25:59 AM »
Crazy idea perhaps, but did you happen to try to enter the topic title in the ebay search box...

Not clear what will be most suitable for this particular led, probably best to wait until you have it in your hands.
Usually, that gives much better impression on mounting requirements than the typical eBay images.

Online Psi

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Re: LED Heatsink 10W?
« Reply #2 on: July 26, 2012, 11:19:28 AM »


That's one of the four sections of my room lighting.
Heatsink is 10.5cm x 5.5cm with thick fins on the back.

It has 3 white leds (3.2W each) and most of the time these are all i use.
The others there are 1W in RGB but only used to tint the color a little.

So i estimate it's dissipating at least 10W

It gets hot enough that you don't want to hold it for more than 5 seconds or so, probably around 50degC.
Which is within the specs of the leds.

The entire lighting rig has been my room lighting for 4 years now and no leds have died.

« Last Edit: July 26, 2012, 11:29:29 AM by Psi »
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Offline BigBrother

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Re: LED Heatsink 10W?
« Reply #3 on: July 26, 2012, 12:09:59 PM »


That's one of the four sections of my room lighting.
Heatsink is 10.5cm x 5.5cm with thick fins on the back.

It has 3 white leds (3.2W each) and most of the time these are all i use.
The others there are 1W in RGB but only used to tint the color a little.

So i estimate it's dissipating at least 10W

It gets hot enough that you don't want to hold it for more than 5 seconds or so, probably around 50degC.
Which is within the specs of the leds.

The entire lighting rig has been my room lighting for 4 years now and no leds have died.


nice! and wow, 4 years... long time. what kind of power supply are you using?

Online Psi

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Re: LED Heatsink 10W?
« Reply #4 on: July 26, 2012, 01:26:34 PM »
When i made it i couldn't find a power supply in my junkbox that could handle 8A so i mod'ed the led PWM driver so the white and RGB led sections were powered separately. Then i used a ATX powersupply plus an old 5A 12V supply.

The driver isn't anything special, it's a bit of a mess really :P
LEDs are arrange in series to get multiple sections of around 11V and 4 mosfets drive the White/Red/Green/Blue sections from 12V through resistors for current limit.

mosfets are driven from a ATMega at around 1kHz PWM, the mcu also does IR remote control.

Eventually i'll make a new one using 1-2 of the deal extreme 30W RGB single leds. Probably with a 230V switchmode built onto it and UPB control through the house wiring.

This is it...
LED Room Lighting




« Last Edit: July 26, 2012, 01:33:11 PM by Psi »
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Offline BigBrother

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Re: LED Heatsink 10W?
« Reply #5 on: July 26, 2012, 01:39:05 PM »
damn... maybe if I had the ceiling fan from the next room which is a 2 bulb socket with a glass globe around it, I could do something similar to what you have. But, alas, what I have is 3 separate glass cones for one bulb each... so I'll have to figure something out in order to stuff a power supply, the heatsink, the LED and a reflective cone.

Offline slateraptor

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Re: LED Heatsink 10W?
« Reply #6 on: July 26, 2012, 02:36:21 PM »
This is it...

In the words of Borat: "Sexy time...yeah."

Online Psi

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Re: LED Heatsink 10W?
« Reply #7 on: July 26, 2012, 03:03:39 PM »
There's actually an issue with RGB lighting, girls keep setting it to pink.
hehe
« Last Edit: July 26, 2012, 03:14:25 PM by Psi »
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Offline T4P

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Re: LED Heatsink 10W?
« Reply #8 on: July 26, 2012, 06:37:03 PM »
Me thinks that heatsink is a bit tiny for 10W  ::)
http://the4thpin.comeze.com <-- Rants and Reviews! sorry my english  :palm:

Online Psi

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Re: LED Heatsink 10W?
« Reply #9 on: July 26, 2012, 06:41:00 PM »
Well it works fine for me. And we're talking about 3x 3.2W leds plus a few other leds on around 10%.
And then there is a few large resistors thermal epoxyied to the other side.

I can't see it being under than 10W

The metal is pretty thick, about 4mm.
The picture maybe distorting the size a bit, its 10.5cm x 5.5cm
« Last Edit: July 26, 2012, 06:43:58 PM by Psi »
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Offline T4P

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Re: LED Heatsink 10W?
« Reply #10 on: July 26, 2012, 06:47:27 PM »
Well it works fine for me. And we're talking about 3x 3.2W leds plus a few other leds on around 10%.
And then there is a few large resistors thermal epoxyied to the other side.

I can't see it being under than 10W

The metal is pretty thick, about 4mm.
The picture maybe distorting the size a bit, its 10.5cm x 5.5cm

Well ... mistake then.
So what's the temperatures it's giving out?
http://the4thpin.comeze.com <-- Rants and Reviews! sorry my english  :palm:

Online Psi

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Re: LED Heatsink 10W?
« Reply #11 on: July 26, 2012, 06:49:39 PM »
Well it works fine for me. And we're talking about 3x 3.2W leds plus a few other leds on around 10%.
And then there is a few large resistors thermal epoxyied to the other side.

I can't see it being under than 10W

The metal is pretty thick, about 4mm.
The picture maybe distorting the size a bit, its 10.5cm x 5.5cm

Well ... mistake then.
So what's the temperatures it's giving out?

I don't have an IR probe to check but as i said above, you can hang onto it but it starts to hurt after above 5 seconds, I estimate around 50degC. The leds i'm using are rated to max 80C operating temp
« Last Edit: July 26, 2012, 06:51:42 PM by Psi »
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Offline mianchen

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Re: LED Heatsink 10W?
« Reply #12 on: July 27, 2012, 03:55:25 AM »
Very NICE !!!




Is this plastic or glass?

Offline T4P

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Re: LED Heatsink 10W?
« Reply #13 on: July 27, 2012, 04:55:21 AM »
me thinks acrylic
http://the4thpin.comeze.com <-- Rants and Reviews! sorry my english  :palm:

Online Psi

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Re: LED Heatsink 10W?
« Reply #14 on: July 27, 2012, 07:51:29 AM »
It's a cut up recipe-book holder :)
Either perspex, acrylic or polycarbonate, not sure which.
The top side has been sanded to make it less transparent (looking at the light hurt your eyes when it was 100% transparent)
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