Fourmilab's Coruscating, Actinic, (partially) Nuclear-Powered Christmas Lights

There are few things as frustrating as putting up your Christmas lights and discovering that a majority of the series strings of incandescent bulbs have failed. Why not put an end to it forever by replacing them with Light Emitting Diodes (LEDs)? This do-it-yourself project migrates from existing incandescent lights to LEDs according to your own schedule and budget.