1.Switch to Auto mode, and install the light where it can be exposed to direct sun 2.When it gets dark, the light will turn into dim mode, if a person walks by, it will turn into bright mode. 3.Don't put two Solar wall light too close as the light of A product may affect the light sensor of B product. 4.If you have follow above step and the light still doesn't work properly, please contact the seller for support