The answer to 'why is my landscape lighting bare spots' is that there are several common causes, including improper installation, damage to the wiring, or issues with the power supply. Bare spots in your landscape lighting can be caused by a break in the electrical circuit, which prevents the lights from illuminating certain areas.
Some symptoms of this problem include darkened or unlit areas, flickering lights, or a complete loss of power to some fixtures. To troubleshoot, you'll need to inspect the wiring and connections for any damage or loose fittings. If the issue is with the power supply, you may need to upgrade or replace the transformer. In some cases, the problem could be due to a malfunctioning timer or photocell. Depending on the complexity of the issue, it may be best to call a professional landscaping technician to diagnose and repair the problem.