Different landscape lights for different application.
As for small size 1-3W led inground lights, it’s usually for deck use, or paver use. 6-12W underground light for path or public square use.
But for palm tree, you should use a big enough power led lights, 24-36W would be the best, as a palm tree is around 7-10meters, nowadays more and more hotels are growing palm trees, and in the night time, they should be with lights, which makes the hotel great.
Here below is the application of led underground light for palm trees in THE DESERT ROSE hotel in Hurghada city, Egypt.