The answer to 'landscape lighting thin grass' is that thin, patchy grass is a common issue when installing landscape lighting. The main causes are often inadequate soil preparation, improper irrigation, and damage from trenching or digging for the lighting wires.
Some common symptoms include bare spots, thinning grass, and uneven growth around the lighting fixtures. To address this, you'll need to carefully inspect the soil, adjust your watering schedule, and consider re-seeding or re-sodding the affected areas. In some cases, you may need to call a professional landscaper to properly repair and restore the grass.