01-26-2007, 02:53 PM
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Originally Posted by Jaysn
Here's a schematic of my final circuit. The doc that came with the lights said the LEDs were 5V. Use at your own risk. :D
Brandon, yes I have plants. ~12 stems of anarchis, ~10 java fern, a red leafed sword, and an aquatic onion looking thing. These are just nightlights and are not meant to light the tank during the day; for daytime lighting I have a pair of 15W aqua-glo bulbs and a pair of 10W CF bulbs I recently added.
LEDs are actually around 0.7 volts each. You pull the remainder of the voltage down through the resistors. There is very little current flow so the resistors should not get hot. LEDs are designed to run on DC current though. They only light when the current is running one way, when the polarity reverses, they do not light or conduct. Therefore your LED's are flasing 50 times a second (as does a fluorescent tube) I would be inclined to use a low voltage DC transformer to power them, even if they were not over a tank of water. Actual voltage is not critical. The resistance need not be this high either. Anything over about 330 ohms is sufficient. You could use a variable resistor of say 1K in series with a 330 ohm resistor and use it as a dimmer.