Download instructions here
Topled.nl - Instruction - 1 to 12 volts.pdf
- About connecting 1 LED to a 12 Volt source.
Topled.nl - Instruction - 3 to 12 volts.pdf
- About connecting 3 LEDs to a 12 Volt source.
What is a LED?
LED means Light Emitting Diode.
In the series of electronic components, LEDs are with the semiconductors.
You may have heard about diodes, diodes are semiconductors.
But what does that mean to you?
Only one thing: a LED has a positive and a negative end.
If you would connect it the wrong way, it won't conduct and you won't see any light.
On this website, the luminious intensity has been expressed in mcd.
That means millicandela. 1000mcd equals 1 candela, which is the intensity of one candlelight.
So you see, with a 5.000mcd LED, you really got a nice one!
You can't connect a LED to any source. Using direct current is the best, though alternating current is also possible.
The voltage a LED needs to turn on depends on the type.
The red, amber and orange LEDs need about 2 volts.
The blue, green, pink, UV and white LEDs should have about 3.4 volts each LED.
If you would like to connect 3 LEDs on a 12 volt source, you can do the following:
One LED plus a resistor on 12 volts and parallel two other leds with a resistor on 12 volts.
Each LED branch (of which we've got 3 in this example) uses about 20 milliAmps. In this example the source supplies:
3 × 20 milliAmps at 12 volts.
Which gives us: P = U × I = 12 × (3 × 0.020) = 0.72 watts
You might think: well, can't we make that a little more efficient? Don't resistors use energy? They do! The resistors do take a part of the voltage away so that the leds won't overheat (and eventually end up dead).
With 3 LEDs in a series + resistors, you'll need less energy.
You'll need: P = U × I = 12 × 0.020 = 0.24 watts
First example I used blue LEDs and 470 ohms resistors, second example I used a 120 ohms resistor.