Testing out some 10W Chinese LEDS - Page 13
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 04-16-2012, 02:15 PM #181 hcker2000 Algae Grower   PTrader: (0/0%) Join Date: Feb 2012 Location: Columbus, Ohio Posts: 62 There are many ways to wire them up. I will give you some examples. 1. All leds in series. For three 10 watt leds you would need roughly 33 volt - 1 amp driver. 2. All leds in parallel. For three 10 watt leds you would need roughly 11 volt - 3 amp driver. 3. Combination of 1 and 2. For FOUR leds. You could do two sets of leds in series. Your Driver would need to be 22 volt - 2 amp driver. Just a status update on my setup. Still running it without fans. Plants are loving the 30 watts of led lights. Dwarf hair grass is still healthy. Wysteria is growing crazy still. Going to spread the three main stems out a bit so each gets more light.

04-20-2012, 05:42 PM   #182
Naekuh
Planted Tank Enthusiast

Join Date: Oct 2011
Location: Los Angeles
Posts: 884

Quote:
 Originally Posted by ugn The constant current route is the preferred way to go, I know. But the math was really the question, if I got that one right, as it seem's I don't :p How can 5 units of 10W LEDs need 60 volt, if 6 needs 36 volt? Do you wire 2 set's of 3 in series, and then parallel the 2 set's? To make the story shorter, my plan was to use 10 units in total. 2 active heat sinks with 5 LEDs on each. I can always add a LED (or to) extra if that makes the driver choice easier Any tips is much appreciated!
Each 10W LED draws 12V @ 900mA. ~ 10.8W
if you have 5 of them on serial, they would draw 60V @ 900mA = 54W

Where are u getting 6 needs 36V?
The LED's would need to be 6V each, and these LED's dont run so well @ 6V.

04-21-2012, 12:18 AM   #183
ugn
Algae Grower

Join Date: Mar 2012
Location: Norway
Posts: 39

Quote:
 Originally Posted by Naekuh Each 10W LED draws 12V @ 900mA. ~ 10.8W if you have 5 of them on serial, they would draw 60V @ 900mA = 54W Where are u getting 6 needs 36V? The LED's would need to be 6V each, and these LED's dont run so well @ 6V.
It you read a couple of post's back you'll see.

You can wire 3 LED in serial, so they draw 12v*3 = 36V and you do this twice, but then you wire these two "strings" in parallel. So they still draw 36V, but twice the amp.

Then you still can feed them constant current, as long your driver is in the right amp range.
The advantages, as I see it, is that it's much easier to find a driver.

(Ok, I'm no expert on this, so please tell me if I got this totally wrong )

 05-14-2012, 06:42 PM #184 hcker2000 Algae Grower   PTrader: (0/0%) Join Date: Feb 2012 Location: Columbus, Ohio Posts: 62 Just wanted to post an updated and let every one know the leds are still going strong. Plenty of light to keep every thing in my tank growing. Even some hair grass which I'm kinda surprised about considering I'm not running any co2.
 05-18-2012, 01:26 AM #185 ugn Algae Grower   PTrader: (0/0%) Join Date: Mar 2012 Location: Norway Posts: 39 Thank's for this thread! Ordered and tested 8 of these led's (and fan's) like this: And in a totaly dark room: With a 120mm fan on the backside, running at ~19db (totaly silent), in one hour the heat sinks are running at 42'C/107'F. Feeling this maybe be a little overkill for a 200L tank.. : but again, we like overkill! Have to get CO2 to keep the algae back now?! Damn, my eyes are hurting!
 05-18-2012, 10:45 PM #186 Sdavis1982 Planted Member   PTrader: (1/100%) Join Date: Apr 2012 Location: Rockford,Il Posts: 181 How are you messuring the temp? Infered hand held? From led side or fan side? Base of led? I also built a three 10w led set up with two 6500k cool white and one blue. Asking so i can see how close my set up is to yours temp wise. Here are some pics. first one right side has led left stock old bulb. Led on 40mm heatsink and fan. Sent from my SGH-T989 using Tapatalk 2
 05-19-2012, 03:42 AM #187 Quesenek Planted Tank Obsessed   PTrader: (1/100%) Join Date: Sep 2008 Location: Chattanooga Posts: 352 If I were to get say 6 of these for my 75g 3 on each side staggered how much better would they be compared to my 1 bulb t5ho light? And how much would I need to compare to a 4 bulb t5ho fixture? __________________ FILSTAR Pimp #162
 05-19-2012, 04:30 PM #188 ugn Algae Grower   PTrader: (0/0%) Join Date: Mar 2012 Location: Norway Posts: 39 I used one of these: Placed the sensor (placed/hammered/punched) about the same position as one of the LEDs. The whole heatsink held about the same temp (measured by hand) so I think it's accurate enough for me and my use. (Picture is taken now for illustration, the temp is room temp) The problem now is finding a driver for this.. 12v/4A - 24v/2A - 48v/1A constant current.
 05-19-2012, 07:54 PM #189 Sdavis1982 Planted Member   PTrader: (1/100%) Join Date: Apr 2012 Location: Rockford,Il Posts: 181 I used one like this. Same company little smaller. http://pages.no ebay links allowedcom/link/?nav=item.view&id=320908747113 Sent from my SGH-T989 using Tapatalk 2
 05-24-2012, 01:48 AM #191 ugn Algae Grower   PTrader: (0/0%) Join Date: Mar 2012 Location: Norway Posts: 39 What driver do you use?
05-24-2012, 03:09 PM   #192
Algae Grower

Join Date: Dec 2007
Location: Plano, Tx
Posts: 142

Quote:
 Originally Posted by ugn What driver do you use?
Its a custom driver/controller I built just for this tank. Here is the thread for it.

http://www.plantedtank.net/forums/di...led-setup.html

The thread has all the details but basically it is an event/calendar based controller that drives the LEDs via pulse width modulation of the 12 volt rail. I ran the LEDs in parallel with current limiting resistors inline, each LED gets ~900mA at full power. Full tilt this thing produces 130 watts of LED power.

 05-24-2012, 03:59 PM #193 Sdavis1982 Planted Member   PTrader: (1/100%) Join Date: Apr 2012 Location: Rockford,Il Posts: 181 Have u made any for people? Are you still happy with its long term use? At \$40 i would want to talk about having one made for me. Sent from my SGH-T989 using Tapatalk 2
05-25-2012, 03:29 PM   #194
Algae Grower

Join Date: Dec 2007
Location: Plano, Tx
Posts: 142

Quote:
 Originally Posted by Sdavis1982 Have u made any for people? Are you still happy with its long term use? At \$40 i would want to talk about having one made for me. Sent from my SGH-T989 using Tapatalk 2

I have been using this controller for over a year and it has been working great. It controls my LEDs, T5NOs, and now my CO2. The time drift is minimal, maybe a few minutes per year. I would say it is pretty well de-bugged at this point, but there are still a few features I am wanting to add.

I have not built any for others yet. When I get the software finished I will be happy to make some for the folks here. \$40 is the cost of parts, I would charge around \$80 as it is a process to build the thing.

 05-25-2012, 04:26 PM #195 Sdavis1982 Planted Member   PTrader: (1/100%) Join Date: Apr 2012 Location: Rockford,Il Posts: 181 That sounds fair Sent from my SGH-T989 using Tapatalk 2

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