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I'm not clear exactly what you are trying to accomplish. If you are thinking of actually varying the brightness of individual lamps at will, I can guarantee you that there are much better goals in terms of your time and resources. In any event, if you are talking (as I assume) about 1.5 volt bulbs, you should build or buy a 1.5v power supply; it'll be a whole lot simpler than wiring resistors in, etc. One piece of practical advice: you will save yourself a lot of trouble and complication if you standardize on a single bulb type from a single supplier - and even buy them at the same time.
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