Quote:
Originally posted by xrunner1234
What a waste of power in those resistors. The best way to drive with minimal power loss would be to use a current source. You can run them off the rectified AC line, use a buck converter and design for a current source. Use 1 sense resistor for feedback and set to max current.
Stack as many of them in series so that the sum of the worst case voltage drops would be less than the rectified line and let the converter do the work.
Cost and complexity may be a little higher but this is another solution.
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True, but the majority of people aren't familiar with designing current sources, or even familiar with them at all. However, practically anyone can understand the concepts behind using resistors to determine current. Even if it is rather inefficient.