Update:
I spoke with a Malibu light factory guy who’s been in customer service for years. His info made sense.
1. Your irrigation controller usually converts to 24V & most Malibu lights are 12V.
2. He’s seen too many fires from improper connections & systems.
3. The 24V output from the irrigation controller “could” cause an over amperage so a 5Amp fuse or breaker is recommended.
My Summary:
Being cheap is no reason to try & convert this…fires are expensive.