A rare sight only five years ago, blue LEDs now seem to be everywhere: on laptops, DVD players, air ionizers and even toothbrushes. And they have some consumers seeing red. Some people find the blue LED “distracting” and “annoying”. While red and green LEDs have been available for decades, blue LEDs only became practical in the 1990s. Novelty value has helped make them a popular choice in modern product design.
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