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It seems to me the name "semiconductors" just indicates the number of free moving carriers(electrons or holes) lies between that of conductors and insulators. I feel there are no abosolute boundary between conductor, semiconductor and insulator.
Re: Light source
Maybe another popular choice is LEDs, which is light and more power efficient than most car bulbs. They have been used widely in many luxury cars.
It is the best to always use unit-sized capacitors to realized the required ratio. But if it is not possible, try to make the capacitor's perimeter-to-area ratio the same with unit capacitor. I remember K.Martin's book has a good example of the trick.
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