The answer to 'landscape lighting schedule' is that the optimal schedule for landscape lighting depends on several factors, including the type of lighting, the purpose of the lighting, and your local climate and daylight hours. As a general guideline, most landscape lighting should be set to turn on at dusk and turn off at dawn, or to operate on a timer that mimics this natural cycle.
For security lighting or accent lighting, you may want to keep the lights on all night. For path lighting or other functional lighting, you may want to have the lights turn off a few hours after midnight to conserve energy. The specific schedule will depend on your needs and preferences, but it's important to follow local regulations and be mindful of light pollution and energy usage.