The European Union recently announced a ban on halogen light bulbs, to persuade the public to switch to LED lamps. It’s unlikely to raise many eyebrows. There are, after all, lots of different lamps on the market. Some generate light by a white hot filament (incandescent lamps, such as halogen), some by an electrical discharge through a gas (such as fluorescent lamps) and some by the passage of electrons through a semiconductor (LEDs). LEDs are low-voltage devices and the light they give depends on the circuitry hidden in the lamp itself, which changes the alternating current to provide the low…

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