It will be 31V DC, but polarity reversing to create the light effects.
It's a pretty common voltage for light sets, so maybe but some other set from Bunnings that has the same spec adapter?
@David_AVD I just did that and it works!!Is the one you found in Bunnings part of a light set or by itself?
If part of a set, chop the plug off the new light set and splice onto the old ones.