When I graduated, my first project was to make a UK LED based wait indicator. The problem was, the standard specified "white" light. At the time while LED's where made using UV LED's and phosphors was used to make it white. This meant that for 100 LED's, the coat would be about £100 just for the LED's. In the end we got the specification changed to include a yellow, (we showed that a tungsten light bulb running at 45vac is very yellow anyway, so it was more a correction in the spec than a change)
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