Final answer:
To determine the ideal height for proper lighting, consider the task being performed and aim to prevent glare and shadows. For reading or studying, the bottom of the light source should be at eye level. There may be specific recommendations for different situations, such as OSHA's recommendation of 500 lx on desktop surfaces in an office setting.
Step-by-step explanation:
To determine the ideal height for proper lighting, it is important to consider the task being performed. In general, the lighting should be positioned at a height that prevents glare and shadows, while providing sufficient illumination. For activities such as reading or studying, the bottom of the light source should be at eye level to minimize shadows on the working surface.
However, there may be specific recommendations for different situations. For example, in an office setting, the Occupational Safety and Health Administration (OSHA) recommends an illuminance of 500 lx (lux) on desktop surfaces. This could be achieved by lowering the lighting fixtures if the current illuminance is below the recommendedlevel.