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I have a 55 gallon aquarium filled with native fish I purchased at a fish store. I got the tank from a friend for free and didn't realize how expensive it could get to have fish. I started out with just a couple of cheap florescent lights I got for 5 bucks each mounted on a  piece of plastic I bought, and cut it to fit in the lip of the tank. After a while It started to look boring and I wanted to buy a nice light. I didn't realize lights would be so expensive so I decided to make an LED aquarium light of my own. This instructable will show you how to make an LED aquarium light with a moonlight option for a reasonable price and it looks pretty cool too. I know there are other LED aquarium lights on here but some are very confusing and some just are not very bright.

Step 1: Materials

Here is a list of materials you will need:

Soldering Iron
Solder
Resistors
LED lights 
Acrylic 
LED holders
Drill
Aluminum trim
Black plastic sheet
DC power supply 

Step 2: Designing Light Layout

Step 1. You first will need to design how you want your led lights to be lined up. I just tried to space them out evenly but it is all up to however you want to do it.

Step 2: Measure the lip of the tank so your piece of acrylic will fit nicely. Remember to cut it a bit smaller because you will have to add your aluminum trim later on  which is about a 1/4 of an inch on each side. I'm not sure of the proper way to cut the acrylic, I just used a knife and cut where i wanted and then bent the acrylic and it will break off very nicely.I bought a piece of acrylic at the local hardware store I think it was about $4

Step 3 After you figure out the position you want your LED's and cut the acrylic to desired shape the next step is to drill into the piece of acrylic where you want to put your lights. You should drill the holes so that the led holder of your choice fits nice and snug i'm sure if it is a little bigger or smaller it is okay. 

Step 3: Adding LED Holders

Next I added the LED holders which I bought off of ebay for $3 for 100 of them. They are 5 mm holders because the LED's I bought were 5 mm. I bought the plastic chrome ones because they were cheaper and I'm glad I did because the few metal ones I bought from radio shack for a ridiculous price have started to rust.  

Step 4: Adding the LED's

Step 1:
I bought my lights off of ebay like everything from this project basically. Before I started this project I had no idea how LED's worked or anything about lights or electricity. To put the LED's in the holders you just take the little clear plastic end that comes with the holders and stick the two ends of the LED through the two holes in the clear plastic holder. The Positive end of the LED is the longer end of the barb. The negative is the smaller end. If you happen to cut the ends so you cant tell which is longer, you can look inside the LED and the metal piece that is smaller inside the LED is the positive side. I lined up all of the positive ends facing the same way so they went positive negative positive negative, and so on. http://led.linear1.org/led.wiz this website will give you an example of what your wiring should look like and what resistors you should use.

Step 2: 
You will also need resistor which you can get on ebay or at any local electronic store. To determine the amount of resistance you will need for your lights you will need to use Ohm's law which is I=V/R or you can just type in LED calculator on google or whichever search engine you use. For my lights I needed to use a 100 Ohm resistor for a series of 3 lights.  You will be able to type in your power source voltage, forward voltage, forward current, and the number of leds you want in your array from the link in the above step. The resistors are not polar sensitive so can go on either the positive or the negative it doesn't really matter.

Step 3:
On my light I wanted to have a moonlight switch so make sure whichever lights you want to be your moonlights make those blue. You are going to have to wire them separately from the white ones to be able to just have the blue lights on. You can have all of the negatives together but the blue positives should be soldered together separately. 

Step 4:
I sanded my LED's to try and diffuse the light a bit but it still made a beam of light into the water. I then tried to put hot glue on the end of the holders and that did the trick. You may like the beams of light personally I didn't so just use some hot glue and it will fix that and waterproof it.
  

Step 5: Finishing Aquarium Light

Step 1:
Next I added the aluminum trim around the edges to make the light more sturdy and give it a nice look. I got the trim from my local hardware store for like 6 bucks total. I just drilled a hole through the aluminum and into the acrylic. I forgot to say earlier, when drilling through the acrylic you can have the drill at a fast speed just make sure you don't put a lot of pressure on the material because it cracks relatively easily. after you drill the desired amount of holes to hold the trim onto the acrylic you can add your nuts and bolts to hold it together.

Step 2:
You will want to wire a wire from the positive from all your white lights to your desired switch.  Then to the power supply mine is a 12 V camera charger you can use just about anything as long as it is DC current. Then you will want to wire all of your blue lights from the positive end to the other switch or if you have a three way switch. The negative ends of your light series can go to the negative end to the power supply it doesn't matter if they are from your white lights or your blue lights. If your like me and wanted a clean look you can buy some female DC connectors to connect your lights to the power supply and since I have a 55 gal tank I used these to connect each half of my lights to the other.

Step 3:
Next I attached the black cover I cut out of a plastic sheet I got from Menards, and cut a hole for my switch to fit in nicely. And that is it your ready to turn the lights on on and hope it works haha. Please feel free to ask any questions, because i'm sure I am missing something. Feel free to also criticize or give feedback on what you think I could do differently.It is very easy once you figure out how everything works. 
Great Instructable! I found and LED light panel at the LFS this weekend for $459. I have no intention of paying $459 for a light panel. Planning to make one and your plans look great. Love the link you gave - it give nice schematics for making your array.<br><br>Quick question - do you have any problems with heat? I am assuming these lower voltage LEDs don't generate much heat.
Hello, <br>I was the one that did this Instructable but now that I can't figure out how to log in with facebook anymore I had to make a new account. Sorry my reply is so late. <br><br>The lights put off a little heat but very very little compared to a high powered LED. No heat sink or fans are required for these small LED's.<br><br>I actually made a different light that I haven't put on here yet that I think you would like a lot better. My new light uses 2 10W and 4 blue 1W high power LED's that I got off of ebay. This light puts off a lot more light than the light in the instructable and it was cheaper. Also the new light does wonders for my live plants that I added, they have nearly tripled in size since I added the new lights.<br><br>Would you like me to make an instructable on the new light fixture that I made?<br>
Hi, <br> <br>Any chance of getting an instructable for the new light? (I realize this is an old thread :-) ) <br>
Absolutely, I would love to see an instructable on the new light setup! I have a regular florescent hood on my 75 gallon. I modified the hood and added two blue cold-cathode tubes for moon lights. The lights and moon lights are on separate plugin timers.<br><br>I haven't gotten around to starting an LED light project because the 120 gallon tank I bought used had a small leak. So I fixed it. Now the small leak (literally drops) is now a super-small leak. This time it is only a very thin film of water on the bottom of the tank, no drops . . . but I still need to fix it right. A real pain to empty and rotate a 120 gallon tank so you can work on it.<br><br>But enough of tank problems! Please, make a new instructable for the new light - would love to see how it was made and how it turned out.
Nice Instructable. <br>I used this as inspiration for the one I put together. <br> <br>Some others use a rail rather than a lot of wiring (i used wire), have you considered it?

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