You Do Need power plug adapter while traveling from Gaza Strip to Saint Lucia.

Here is Why You Need An Adapter

The outlet and plug type used in Saint Lucia is G and in Gaza Strip are C and H. This is how they look like.

Gaza Strip

In Gaza Strip, outlets of type C and H are in use.

Type C

Type H

Saint Lucia

In Saint Lucia, outlets of type G are in use.

Type G