WHAT IF ONE BULB ( DIODE) FAILS ?

IF ONE DIODE OR BULB FAILS ON A 3 METRE STRING THE STRING WILL CONTINUE TO WORK. WHEN 10 FAIL ON ONE STRING THEN THAT STRING WILL STOP LIGHTING BUT THE POWER WILL FLOW THRU TO THE OTHER STRINGS WHICH WILL CONTINUE TO GLOW. YOU SIMPLY REPLACE IT BY UNSREWING THE FAILED STRING.