Halogen lamps are rightly popular because
they give a good light and have
an excellent efficiency. Unfortunately,
they tend to be costly. Moreover, they often
give up the ghost when they are switched
on, because they then draw a very high
current (same ten times normal, equivalent
to roughly a hundred times their
normal powerating). A simple passive circuit
can remedy this, but only for DC
operated lamps. If they are AC operated,
a rectifier could be added, but that gives
relative high losses at 6 V or 12 V.
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