Multi chip leds diy - Page 3 - The Planted Tank Forum
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post #31 of 51 (permalink) Old 10-10-2013, 05:07 PM Thread Starter
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Fresh out of the box. Starting to wonder if my old cpu cooler can handle this massive chip... The base is about 8x6.5cm



Must have made a really bad calculation somewhere The chip is quite enormous.


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Originally Posted by micheljq View Post
That setup using CPU cooler is interesting.
Michel.
They are very good for diys - easy to find dirt cheap or for free and flexible in possible uses. But bare in mind that they have a very limited cooling effect when run without a fan. My intel cooler could barely cope with a 10w led chip.
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post #32 of 51 (permalink) Old 10-15-2013, 06:51 PM Thread Starter
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Copper shim in place. The adhesive has cured over night


No great ideas how to attach the chip. Had to remove the computer mount so... I dont want to glue it in place.
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post #33 of 51 (permalink) Old 10-16-2013, 02:10 AM
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I don't think you have too many choices there. You would either use the heat sink adhesive and glue it or use regular heat sink compound and try and strap it into place somehow. Too bad that shim wasn't a little bigger so you could screw the LED to it then glue the shim to the heat sink. I guess you could always use some type of wire/cable through those mounting holes on the 4 corners and wire it back to those fins on heat sink.

I think I'd just glue it and be done with it.

Where do you apply power? Do you have to solder the wires to those two tabs on the front?
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post #34 of 51 (permalink) Old 10-16-2013, 04:51 AM Thread Starter
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Thanks for the input mikez. Im going to look into putting a threaded m2 rod or just a plain thick steel wire through the fins and up to the chip. If it doesnt work Ill just glue it in place. The glue residue is so darn hard to remove if/when a remake is needed so not to keen on it.

Yes you got it right, the small tabs are negative and positive solder areas.
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post #35 of 51 (permalink) Old 10-20-2013, 03:42 PM Thread Starter
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Drinking coffee and making two improvised brackets out of a m3 threaded rod.


Some arctic silver heat transfer paste.


Nuts and washers in place and tightened. Feels really secure!


Time to start working on cable routing.
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post #36 of 51 (permalink) Old 10-20-2013, 06:15 PM Thread Starter
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[/quote]
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post #37 of 51 (permalink) Old 10-21-2013, 01:15 AM
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It's alive!!!


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Fluval EDGE slightly modded, low tech
3+ gallon (40 x 16 x 20.5 cm) aquatic soil, low-tech
Fluval spec V (sitting in a box)
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post #38 of 51 (permalink) Old 10-21-2013, 03:29 PM
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Looking great!
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post #39 of 51 (permalink) Old 10-21-2013, 09:14 PM Thread Starter
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Glad you like it.

Im in the process of scaping and testing a temporary wall mount for the light cannon. Still waiting on a suitable reflector and lens. The light is running at approx 10-15% capacity. The goal is to get the beam rectangular to fit the tank and stop those massive reflections of the wallpaper.


Last edited by Matsnork; 10-22-2013 at 09:28 PM. Reason: fixed broken img
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post #40 of 51 (permalink) Old 10-22-2013, 09:42 PM Thread Starter
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So been testing the chip for a few hours straight while scaping and when running at about 50% (75w) without a fan the chip and base of the cooler barely gets warm and the light will most likely be enough when the reflector and lens get installed.
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post #41 of 51 (permalink) Old 10-29-2013, 12:11 AM
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Looking good. Love the way you mounted it to the heat sink.


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post #42 of 51 (permalink) Old 10-29-2013, 01:34 PM Thread Starter
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Glad you like it. Still waiting on reflector and lens. Going to shop for 4-lead cable and connectors today.

More updates to come, stay tuned.
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post #43 of 51 (permalink) Old 10-29-2013, 10:02 PM
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That looks bright, nice stand too. Are those lava rocks?

Will you be able to check PAR levels?


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post #44 of 51 (permalink) Old 10-30-2013, 01:09 AM Thread Starter
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Got my lens today, but sadly I made a blunder when ordering, didnt get the kit wich included reflector...

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Are those lava rocks?
About 14k lumen according to seller, but Im not sure about that.
Lavastones, yes. But they will not be piled like that. Have a look in my 90P thread for work in progress.
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Will you be able to check PAR levels?
No sorry. Guesstimating par will be a bit limited because of the distance to the aquarium.
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post #45 of 51 (permalink) Old 11-06-2013, 12:20 PM Thread Starter
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Wanted to try the lens out so I made a temporary reflector out of an old plastic lid and aluminum tape. The improvement is quite dramatic irl, impossible to capture on camera. The light is very bright even on approx 20% power.

I need to find a way to make the beam more rectangular so not to light up the wall so much.



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