The answer to 'why is my landscape lighting brown patches' is that the brown patches are likely caused by improper installation or damage to the landscape lighting system. This can result in electrical issues that cause the lights to overheat and damage the surrounding vegetation.
Some common causes of brown patches around landscape lighting include buried or damaged electrical cables, faulty transformers or fixtures, and incorrect placement of lights too close to plants. Symptoms may include flickering, dimming, or complete failure of the lights, as well as discoloration and dying of the grass and plants around the affected fixtures.