diy aquaponics system step by step | DIY LED Set for 2ft tank 2nd gen

diy aquaponics system step by step

From the previous design which is 6x3W LED for 2ft tank, I found that it is not bright enough. For this second generation I add another 6 LED, thus total 12x3W led. Still 2 rows but 6 LED for each row.
This time I drive both row together using off the self constant current source LED driver
LED driver manufacturing spec:
- Input voltage: AC 85-265V
- Output voltage: DC 28-45V
- Output current: 670mA

The result is quite good, brighter than 2x36W PL light, more LED mean brightness more uniform and all the plant produce bubble 30 minutes after light on. I do not have equipment to measure brightness nor PAR, so I wonder if I put too much light but never mind, will see how it goes.

Initially I was worry about the heat generated by LED. In the previous design there are only 3 LED on the 5x60 cm aluminum plate, now its double and it is not a heat sink just a plate without fins. Temperature measured just right under the LED heat sink show maximum 49.7 degree C. Not sure the Juction temperature though.

My guess probably because the LED driven at 670mA instead of 1A. I did current measurement using Tektronix current Probe and LeCroy scope, it show that maximum current is ~897mA, minimum current is ~589mA and average around ~720mA. Voltage measured at the driver output is 36.75V. Thus the LED took around 26W.

Power used by the whole light set (LED + Driver) is around 27W. LED alone take 26W, thus LED driver efficiency is not that bad, only 1W power loss.

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diy aquaponics toteponics | Cheater at AGA 2011 competition spotted

diy aquaponics toteponics

AGA International Aquascaping Contest 2011 result was anouced last week and my tank "Lost" happen to be in 2nd place in 120-200L. However to my surprise the 1st place goes to IAPLC 2011 rank #14. It is a great scape, no doubth about it but according to the tank size written on the IAPLC booklet, it is 120x55x50cm tank which is 300L or 87.177 US gallons. How could the tank of that size competing in 120-200L category? I checked the AGA entry details and it was written 100x45x40cm which is 180L or 47.551 US gallons. Someone was obviously cheating. He reduce the tank size so that he can compete on smaller category (maybe he want to be in different category as Cliff Hui) or to have better depth. Imagine 300L tank submited as 180L, reported almost half.

The holy-grail of aquascaping is to make small tank look big. What the easy way to do that? Declare big tank as small tank. Imagine what would hapeen if I declare my 90x45x45cm tank as 30x15x15cm tank? Every one will amaze ont he depth that I create on that tiny little tank.

I have reported this issue to AGA but they dont seem to be eager to disqualify it.


IAPLC rank #14 entry:
AGA 2011 entry:

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