[PDF] Factors affecting the illumination | Illumination Factors | New Topic [2023]

In this note, Poly Notes Hub will discuss the Factors Affecting the Illumination or an illumination factors. Welcome to Poly Notes Hub, a leading destination for diploma engineering notes.

Author Name: Arun Paul.

Factors affecting the illumination or Illumination Factors

Below we discuss about some factors that are affect on the illumination of a light source –

1. Light Source Intensity: The brightness or intensity of the light source plays a significant role. A more powerful light source will provide higher illumination.
2. Distance from Light Source: As mentioned earlier, the Inverse Square Law dictates that illumination decreases with distance from the light source. Closer objects receive more light than those farther away.
3. Light Source Angle: The angle at which the light source emits light can affect illumination. Direct light sources pointing at an object provide more illumination than angled or indirect light sources.
4. Surface Reflectivity: The reflectivity or surface properties of objects matter. Light-colored and reflective surfaces bounce more light, resulting in higher illumination, while dark and absorbent surfaces reduce illumination.
5. Obstructions and Shadows: Objects in the path of light can cast shadows and reduce illumination. This is particularly important in architectural and interior lighting design.
6. Atmospheric Conditions: Air quality and atmospheric conditions like fog, smog, or dust can scatter and absorb light, affecting illumination levels.
7. Light Distribution: The design and placement of light fixtures also impact illumination. Different fixtures and their configurations can distribute light differently.
8. Light Absorption: Some materials absorb certain wavelengths of light, affecting the color and quality of illumination. For example, colored filters can alter the perceived illumination color.
9. Human Perception: Human eyes perceive illumination differently based on adaptation to lighting conditions and individual sensitivity. For instance, dim lighting might appear brighter to someone who has been in the dark for a while.
10. Lighting Design: Proper lighting design considers the intended purpose of the space or task and uses fixtures, placement, and light types to achieve the desired illumination levels and quality.