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I found these last yearhttp://www.onsemi.com/PowerSolutions/parametrics.d...and have used every one in the sample kit they will send you for free. One set for 10, 20, 30, and 50mA plus a couple adjustable ones as well... Super flexible, will run off pulsating dc (no capacitor - but the LEDs get noticeably brighter with one) built in surge protection and they run about $0.52 each from Digikey in small quantitiesAWESOMEP.S. Supertex has a line of similar devices that are slightly both, more expensive and more flexible
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