Different plants can have different light requirements: low, medium, or high. According to this aspect, each plant has its preferable duration of sunlight exposure and light intensity level.
The intensity depends on the distance between the plant and the light source.
Choose a spot according to your houseplant's needs. If your green pet requires full direct sun to thrive, put it in a south-facing window. If low light is required, choose a windowsill facing north.