120 LED Lighting
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Old 04-10-2012, 03:19 AM   #1
raidendex
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120 LED Lighting


Got this as a starting point from Hoppy
- 12 Cree XM-L LED running at 1000 mAmps, 6 per row 4" apart with 6" between rows
- 40 degree optics
- 33" above substrate. Which I guess would put it about 12" above the tank

Here is what I found so far:
12 Cree XM-L - Cool White U2 - http://www.ledgroupbuy.com/cree-xm-l-white/
12 40 degree optics - http://www.ledgroupbuy.com/xml-optic...degree-1-79ea/
12 Thermal tape stars - http://www.ledgroupbuy.com/thermal-t...m-star-6-pack/
Driver - http://www.ledgroupbuy.com/inventron...driver-2100ma/
2 24" Heat sinks - http://www.heatsinkusa.com/1-813/

I guess need some sort of dimmer control for that driver. Also not too sure on the driver itself. From what I read in the description I guess it should run all 12 LEDs? And dimmer should allow to run them at 1000ma if I understand dimming properly :P

Rest - wires, wall outlet plug ?

Any thoughts, shooting for a high light tank.
Thanks!
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Old 04-10-2012, 03:48 AM   #2
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Your heat sinks are going to get pretty toasty in my opinion with the 2100ma driver. I have the 1750ma driver running eight XM-L T6 on that same heat sink 3 1/2 inches apart. Turned all the way up I can't hold my finger on the heat sink more than three seconds.

On the 100 gallon below I have the 40 watt driver which runs at 700ma with 15 XM-L T6 on cheap u-channel and that barely get's warm to the touch at all. I leave that one cranked all the way up on my 100 gallon and it does fine for my low to medium light plants. The face of the 40 degree optics are 29" from the substrate. Here are a few current pictures of that tank. This probably will not give the light you want but probably a good reference point.

Ask Milad how many XM-L's you can put on the 50 watt 1100ma http://www.ledgroupbuy.com/inventron...driver-1100ma/ and report back by the way because I think this is more in line with what Hoppy is recommending and I've been dying to ask.
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Old 04-10-2012, 03:57 AM   #3
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Don't forget the dimmer/potentiometer
http://www.ledgroupbuy.com/10k-ohm-1...r-easy-solder/

You can get one at Radio Shack of the same value but it will be about the same price anyway. For the plug I used a standard two prong extension cord and cut the female end off, that gives you wires and the plug for cheap at any discount store.
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Old 04-10-2012, 04:06 AM   #4
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What dimming does exactly? Does is lower the mapm driver sends out, So 2100ma would be just it's max setting and I could dim it to something like 1000ma? Again don't really know what dimmer part does exactly
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Old 04-10-2012, 04:26 AM   #5
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Honestly, I don't know what it does to amps at each LED. I know your watts will drop a lot and the light gets dimmer, lol. I have one of those Kill-A-Watt meters. It will measure watts and total current being pulled at the plug. I've wired two and would be happy to help with wiring the thing up however, so you can PM me if you have any questions on that. I did use the single core hook up wire to run the LED's so you could pick that up if you want. I've seen a lot of people using heavier gauge but the stuff Milad sells is really easy to work with. From the end of the circuit to the driver I did go heavier because it was a longer run to the driver mounted remotely.
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Old 04-10-2012, 03:21 PM   #6
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I am very interested in this set up
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Old 04-10-2012, 05:17 PM   #7
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The dimmer just reduces the current through the series string of LEDs. Ideally you get LED driver that provides the maximum current you will want to use, then the dimmer lets you reduce that current easily for lower light levels.
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Old 04-10-2012, 05:52 PM   #8
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But this one http://www.ledgroupbuy.com/inventron...driver-2100ma/ should be fine, and allow me to dim it down so LEDs run at 1ish amp instead of 2.1.

I just rather have the ability to turn them up higher if I ever need, than getting a driver that can do 1amp as its max like this one http://www.ledgroupbuy.com/inventron...driver-1100ma/

Though I guess if either can run all 12 LEDs, it would save a bit of cash
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Old 04-10-2012, 07:58 PM   #9
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From reading this

You can tell quickly by the graph as the amperage goes up, the XR-E uses much more voltage than the XP-G and XM-L. At 1 amp, the XR-E uses 3.7v which is 10% more than the XP-G and a whopping 23% more than the XM-L. That means if you have a 48V driver running at 1mp you can only put 12 XR-E CW or 14 XP-G CW or 16 XM-L CW. That means for the same cost of powering 12 XR-E CW which give you 2824.8 lumen you could be powering 16 XM-L CW which would give you 6208 lumens. See how quickly this adds up? Less power, more light, that is what LEDs are all about. This is why efficiency is so important. Every minute you have a non efficient LED wired up, it is costing you money.

I guess http://www.ledgroupbuy.com/inventron...driver-1100ma/ could run up to 16 XM-Ls?
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Old 04-11-2012, 02:03 PM   #10
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Where do you get those cheaper aluminum channels? Lowes or somehing?
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Old 04-11-2012, 05:46 PM   #11
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You can get aluminum channel extrusions from Ebay. Just search Ebay for aluminum channel. I have a local surplus metals dealer where I buy mine, and where they are much cheaper than Home Depot or hardware stores, and cheaper than Ebay.
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Old 04-11-2012, 06:23 PM   #12
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Anyone able to chime in on this driver http://www.ledgroupbuy.com/inventron...driver-1100ma/

Should be able to run 16 Cree XM-L Cool White U2 at 1100mA if I understand it correctly?
At 1100mA xml takes about 3v and we have 48v total on that driver, so 48/3 = 16
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Old 04-11-2012, 06:36 PM   #13
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You can only run it at 50 watts. 50 watts/1.1 amps = 45 volts, 45 volts/3 volts = 15. So, the most LEDs you can run at 1.1 amps is 15. Personally, I would prefer to stay at about 45 watts maximum, which would reduce the number of LEDs to 13.
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Old 04-11-2012, 06:38 PM   #14
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Ok thanks. Just making sure it can run the 12 xmls that you told me I should get for my tank
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Old 04-12-2012, 03:35 AM   #15
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Quote:
Originally Posted by raidendex View Post
Where do you get those cheaper aluminum channels? Lowes or somehing?
I got my aluminum channel at Orchard Hardware Supply which I think is a California chain. Lowes and Home Depot didn't have the one I found when I was looking. The face is 7/8" wide and the channels are 1/2" high. I think it might be 1" X 1/2, just narrower than the spec.
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