Multi-junction solid state transducer devices for direct AC power and associated systems and methods

A lighting system, comprising:

• a multi-junction light emitting diode (LED) die including a plurality of multi-junction SST chains, wherein each multi-junction SST chain has a P-contact, an N-contact, and a drive voltage, and wherein the first and second multi-junction SST chains are configured to be driven independently of each other;
• and
• a driver independently coupled to the individual P- and N-contacts, wherein the driver is configured to drive at least one multi-junction SST chain when voltage input is at least equal to a first predetermined voltage level and drive a different and/or additional multi-junction SST chain when absolute voltage input increases to a second predetermined voltage level.

A solid-state transducer (SST) die, comprising:

• a first multi-junction SST chain having a first drive voltage, a first P-contact, and a first N-contact, wherein the first P- and N-contacts are configured to connect to a first output of an AC driver;
• and
• a second multi-junction SST chain having a second drive voltage, a second P-contact, and a second N-contact, wherein the second P- and N-contacts are configured to connect to a second output of the AC driver, and wherein the first and second multi-junction SST chains are configured to activated independently of each other.