In ground lights

[Pat Tester]

Hi, I have been asked to supply some inground lighting for a garden re vamp. If I use the CFL route rather than low voltage what cable do I use ? The lights are in a flowerbed with about 12" of soil over. Should I use swa ? or is this over the top. I have never looked at these sort of lights and am unaware of the method of
achieving an ip rated seal with the cable and fitting. What do others do. Also have two lighting bollards to go in.
Thanks in advance, Pat