The law aside, do you really want to shoot someone for stealing a solar landscaping light? As far as the statute is concerned, you are justified in using deadly force and do not have a duty to retreat if you reasonably believe that that force is necessary to prevent the commission of a FORCIBLE felony. A forcible felony is a felony that involves the use or threat of force against a human being or in which there is imminent danger of bodily injury to a human being.
If your property is "curtilage" associated with your home, you are justified in using reasonable force, including deadly force to prevent to terminate the other person's unlawful entry.
The law aside, do you really want to shoot someone for stealing a solar landscaping light?