The low-cost LED has changed the way we approach lighting in all its forms, allowing complex addressable displays and all sorts of lighting goodness. But what did we do before we had cheap LED arrays?

But these days, if lit-up letters in a shop window or on the wall of a nightclub catch your eye, odds are they’re made with light-emitting diodes, or LEDs, not the real thing. It’s a fate befalling ...

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