An excellent ideas starter.


Provides circuit outline ideas for numerous LED applications ranging 
from offline cap supply with LM317 (!) through dedicated switching 
based designs.

    http://www.onsemi.com/pub/Collateral/BRD8034-D.PDF

Note on page 12 the extremely novel manner in which they parallel 5 
LEDs :-) !

Please don't ask me for component values :-)
(In most cases there will; be data sheets and app notes available from 
Mr Google.)


        RM 

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