As of recent years, the offer on power LEDs has broadened and
this technology seems to have a bright future in our lives
replacing the incandescent light bulb. I have decided to write
this article about the ways to powering LEDs because many people
have asked me what type of circuit they could use. Compared to
light bulbs, LEDs are a little bit more complex. When you need a
light bulb, you buy one with the appropriate voltage given by
your power source and the required power depending on how much
light it has to give. Things are rather simple. With LEDs it is
a more complicated. First, they are not linear devices. A light
bulb is mostly like a resistor when you are close to its normal
operating point. If you apply 10% more voltage, you get 10% more
current through it and it consumes 21% more power. LEDs, as
their name implies, are basically diodes. And diodes are
nonlinear. The current that passes through them depends
exponentially on the voltage applied. Therefore, if you apply
10% more voltage to a diode, c