What is the main purpose of guards or shades on luminaires?

The primary function of guards or shades on luminaires is to minimize glare. They are designed to diffuse the beam of light emitted from the fixture, making it more comfortable for the eyes and preventing harsh light spots that can cause discomfort or visual impairment.

While guards and shades may also have aesthetic benefits and potentially contribute to energy efficiency by directing light more effectively, their main purpose lies in reducing glare. This is particularly important in settings where prolonged exposure to bright lights can lead to discomfort or hazardous situations. When controlling glare, guards or shades play an essential role in enhancing visual comfort and ensuring a safe environment.

The consideration of thermal protection and the prevention of overheating in fixtures might be an important aspect of luminaire design, but it is typically addressed by other means, such as materials and heat-sinking designs rather than through the addition of guards or shades.