The phrase "full sunlight" means that an area or location is getting direct and bright light from the sun with no obstructions or shade. Full definition
A field of corn growing in full sunlight in the middle of the day uses up all the carbon dioxide within a meter of the ground in about five minutes. (edge.org)
Choose a location with full sunlight for at least six hours per day, as chili peppers LOVE the sun. (chilipeppermadness.com)
They obviously don't realize that most mammals MUST have 10 hours of full sunlight to stay healthy. (thedogplace.org)