I was browsing reef forums and decided to make myself a LED moonlight/nightlight setup.
Just keep in mind when looking at the aquarium pictures, it is a one minute exposure. Its not that bright and you need to get use to the darkness before seeing anything. For me it was more a cool effect than actually being able to see eveything. If you wanted to see more, you would need to add some red LEDs or some other color.
This is actually a pretty easy project. I just soldered the LEDs in series to a 12V power source. LED are light emitting diodes so they only work one way. The longer wire is positive(its attached into the smaler piece inside the bulb)and you attach that side to the positive wire from the power source.
LEDs can fry if you attach them to a power source without a resistor. This becuase there is leftover voltage in the circuit. You need to attach a resistor. So I have 3 LEDs with a 3.7V-4.5V range operating at 20mA. So to figure out the resistor I need, I took the voltage(even thought I had a 12V power source, my meter said it was 16V)
always round up resitance to closest resistor.
So I put 3 47ohms resistors in because thats what I had lying around.
Thats about it, if you wanted to connect more, you would have to attach LEDs in parallel, a little more complicated. Check out this forum thread for more information
Personally, if I had a larger tank I would just throw in a cold cathode tube into the tank as they can be dimmed much better than LEDs can be. You can find those at any PC mod place such as
Anyways, happy modding, hope this was semi-clear.