20W Multichip LED build (Fluval Ebi / Flora) - The Planted Tank Forum
 
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post #1 of 13 (permalink) Old 04-02-2013, 06:12 AM Thread Starter
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20W Multichip LED build (Fluval Ebi / Flora)

I had originally planned to rapid prototype a mounting bracket for a P4 heats - Thread Here
Unfortunately, I couldn't get the price below $100 - and my budget is pretty tight. Also, it may have fallen apart as soon as I attached the heat sink

Instead, I decided to attempt a steam bent wood mount for the grand cost of $3.65. I have never attempted to bend wood before, so this was quite a fun experience.

First, a quick price-out:
20W cool-white LED $6.97
12V to 30-34V current driver (microtek 20/30w) $6.54
12V power supply $5.99
Heatsink + Fan $7.97
Poplar board $3.65
Lens + reflector $3.25 (have not yet received)
Total: $34.37

Onto the build:

I steamed the wood over a pot on the stove for ~2 hours.
A few basement clamps, an aluminum pot, and a torrent of obscenities later - I had the wood bent. I plan to leave it on the pot for at least 24 hours to help the shape take. (will report on whether it does or not)





I decided to use a "Clear Cube" server heatsink as the cooler for its streamlined look and low profile.



Using white lithium grease and super glue I mounted the LED diode set onto the base. If this were a 50 or 100W build I probably would have gone ahead and ordered some legitimate thermal adhesive. But, I happened to have these on hand - so on they went.



I soldered up all the leads and tossed the driver into a small project box.



The fan is powered in parallel, using the 12V supply.



After nearly blinding myself, I have concluded that it works - but that I will need to tune down the fan, which is loud as all hell.



On the plus side, the heatsink remains cool to the touch after extended operation.

The light is scattered across 140+ degrees, but using a 10x lens and hood it can be focused down. I ordered a 30 degree optic kit so that the light can be suspended ~4 inches above the tank.

Here is a shot of my 52mm 10x lens



and some of the nifty effects it can produce



Great, even color eh?
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post #2 of 13 (permalink) Old 04-02-2013, 10:20 PM Thread Starter
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mocked up over the tank



This is how the light will be seated

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post #3 of 13 (permalink) Old 04-03-2013, 02:44 AM Thread Starter
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Up and running:









I don't think I'll end up needing the collimator / lens - but I may strap a lens hood on there to shade some of the spill. If I can find a nice looking rectangular model on the cheap I'll go that route.
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post #4 of 13 (permalink) Old 02-09-2014, 07:25 PM
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No comments on this awesome build!? Great job, wish I had your skills.

edit: Would like to see the same style mount but made out of aluminium doubling as a heatsink.
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post #5 of 13 (permalink) Old 02-09-2014, 08:04 PM
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I think this looks really good, I really like the wood mount. I'd like to see it with the hood on to block some of the spill.
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post #6 of 13 (permalink) Old 02-09-2014, 08:09 PM
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I certainly missed this post until now. Strongly agree with Edub & Matsnork about the build! Creative, well thought-out & executed... very detailed and informative post.
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post #7 of 13 (permalink) Old 02-10-2014, 12:18 AM
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Quote:
Originally Posted by Matsnork View Post
No comments on this awesome build!? Great job, wish I had your skills.

edit: Would like to see the same style mount but made out of aluminum doubling as a heatsink.
Yep it is cool..

My constructive Criticism..Screw the fan, get a proper heat sink.. I hate fans..


Quote:
Fit for 20W LED light

Completely cooling without fans for LED light for 24 hours 365 days
Diameter: 3.5 inch / 90 mm
Height: 2.9 inch / 74 mm
Material: Aluminum alloy
Color: Silvery


you can use cheap thermal compound and screws for mounting..

Bravo on the bending wood.. I used to occasionally do maple but it would steam for days...

Oh and I am well aware this is not very aesthetically pleasing.. Painting it black "might" help..
which the OP's light definitely is......... Bravo again
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post #8 of 13 (permalink) Old 02-10-2014, 12:52 AM
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Very unique light! I really like the steam bent support, but I think I would use some scraps from it to make a wood enclosure for the guts of the light.

Hoppy
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post #9 of 13 (permalink) Old 02-12-2014, 04:53 AM
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This is really an awesome build! This has inspired me to finally try a diy led sometime in the future.
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post #10 of 13 (permalink) Old 02-12-2014, 05:20 AM
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Quote:
Originally Posted by jeffkrol View Post
Yep it is cool..

My constructive Criticism..Screw the fan, get a proper heat sink.. I hate fans..
I love fans
depends in the application really
If you want a small heatsink for a large heat source a fan is a must
if you have room to spare then go for a passive heatsink
I prefer active myself but then you can run into issues when your fan goes out :p hehe

I love this though, simple design and I LOVE the use of the server heatsink
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post #11 of 13 (permalink) Old 03-05-2014, 05:53 PM
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Awesome build. Maybe some small red leds for better plant growth? Where did you get everything from??
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post #12 of 13 (permalink) Old 08-25-2014, 11:42 PM
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Man, that steam bent wood arm is sic! I never would have attempted that. Just don't have the patience. Awesome build!
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post #13 of 13 (permalink) Old 08-26-2014, 04:12 AM
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Awesome awesome awesome! Love it! the ingenuity and creativity, awesome! how much did this light cost after it was all said and done?
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