Lighting Science and Technology

Lighting Science and Technology is a critical field that involves the application of scientific principles to the design, measurement, and control of lighting systems. This explanation covers key terms and vocabulary related to this field, which are essential for understanding the concepts in the Global Certificate in Professional Lighting Design course.

1. Illuminance: Illuminance is the amount of light that falls on a surface, measured in lux or foot-candles. It is the density of luminous flux (luminous flux per unit area) on a surface. Illuminance is an essential concept in lighting design as it determines the level of brightness on a surface. 2. Luminous Flux: Luminous flux is the total amount of visible light emitted by a source, measured in lumens. It is the measure of the power of a light source to emit light. Luminous flux is an essential concept in lighting design as it is used to calculate illuminance and other lighting metrics. 3. Luminance: Luminance is the amount of light that is emitted or reflected from a surface, measured in candela per square meter (cd/m2). It is the brightness of a surface and is an essential concept in lighting design as it affects the contrast and visibility of objects in a space. 4. Color Temperature: Color temperature is a measure of the color of light emitted by a source, measured in degrees Kelvin (K). It is the temperature of a black body radiator that emits light of a particular color. Color temperature is an essential concept in lighting design as it affects the mood and ambiance of a space. 5. Correlated Color Temperature (CCT): Correlated color temperature is a measure of the color of light emitted by a source, compared to a black body radiator. It is the temperature of a black body radiator that emits light of a color closest to the source. CCT is an essential concept in lighting design as it affects the color appearance of objects and surfaces in a space. 6. Color Rendering Index (CRI): Color rendering index is a measure of the ability of a light source to render the colors of objects accurately. It is a scale from 0 to 100, with higher values indicating better color rendering. CRI is an essential concept in lighting design as it affects the appearance of colors in a space. 7. Luminaire: A luminaire is a complete lighting unit, consisting of a lamp, ballast, and housing. It is the physical device that emits light and is an essential concept in lighting design as it affects the distribution and efficiency of light. 8. Lighting Level: Lighting level is the amount of light required for a particular task or activity, measured in lux or foot-candles. It is an essential concept in lighting design as it affects the visual performance and comfort of occupants. 9. Lighting Control: Lighting control is the ability to adjust the level and quality of light in a space, based on the needs of occupants and the environment. It is an essential concept in lighting design as it affects the energy efficiency and functionality of lighting systems. 10. Daylighting: Daylighting is the use of natural light to illuminate a space, reducing the need for artificial lighting. It is an essential concept in lighting design as it affects the energy efficiency and visual comfort of occupants. 11. Glare: Glare is the excessive brightness that causes visual discomfort or impairment. It is an essential concept in lighting design as it affects the visual performance and comfort of occupants. 12. Light Pollution: Light pollution is the excessive or misdirected artificial light that causes negative impacts on the environment and human health. It is an essential concept in lighting design as it affects the energy efficiency and visual quality of lighting systems. 13. Efficiency: Efficiency is the ratio of the useful output of a lighting system to the input power. It is an essential concept in lighting design as it affects the energy efficiency and cost-effectiveness of lighting systems. 14. Light Distribution: Light distribution is the pattern of light emitted by a luminaire, measured in candela or lumens. It is an essential concept in lighting design as it affects the illuminance and uniformity of light in a space. 15. Optics: Optics is the study of light and its properties, including reflection, refraction, and absorption. It is an essential concept in lighting design as it affects the distribution and control of light. 16. Photometry: Photometry is the measurement of light and its properties, including luminous flux, illuminance, and luminance. It is an essential concept in lighting design as it affects the performance and evaluation of lighting systems. 17. Spectral Power Distribution (SPD): Spectral power distribution is the distribution of light energy across different wavelengths, measured in watts per nanometer. It is an essential concept in lighting design as it affects the color appearance and quality of light. 18. Uniformity: Uniformity is the degree to which the illuminance is evenly distributed across a surface. It is an essential concept in lighting design as it affects the visual performance and comfort of occupants. 19. Visual Comfort: Visual comfort is the degree to which the lighting conditions support the visual performance and well-being of occupants. It is an essential concept in lighting design as it affects the productivity, health, and satisfaction of occupants. 20. Zonal Cavity Method: The zonal cavity method is a calculation method used to determine the illuminance in a space, based on the light distribution of a luminaire and the geometry of the space. It is an essential concept in lighting design as it affects the accuracy and efficiency of lighting calculations.

In summary, Lighting Science and Technology is a critical field that involves the application of scientific principles to the design, measurement, and control of lighting systems. The key terms and vocabulary explained in this document are essential for understanding the concepts in the Global Certificate in Professional Lighting Design course. Illuminance, luminous flux, luminance, color temperature, correlated color temperature, color rendering index, luminaire, lighting level, lighting control, daylighting, glare, light pollution, efficiency, light distribution, optics, photometry, spectral power distribution, uniformity, visual comfort, and zonal cavity method are some of the essential concepts that lighting designers need to master to create effective and efficient lighting systems. Understanding these concepts can help lighting designers create lighting systems that support the visual performance and well-being of occupants, reduce energy consumption, and improve the visual quality of spaces.