Luminaire efficiency is a measure of the effectiveness of a lighting system in delivering light output from the light source to the area being illuminated. It is expressed as a percentage and is calculated by dividing the total light output of the luminaire (in lumens) by the total power input (in watts).
Luminaire efficiency takes into account all the losses that occur within the lighting system, such as those from the lamp, the reflector, the lens, and other optical components. A high luminaire efficiency indicates that more of the input power is being converted into useful light output, and therefore, a higher efficiency luminaire will produce more light for the same power input.
Luminaire efficiency is an important factor to consider when designing a lighting system, as it can have a significant impact on energy usage and operating costs. A more efficient lighting system can save energy and reduce the cost of electricity, making it an attractive option for many applications.
It is worth noting that luminaire efficiency is not the only factor to consider when designing a lighting system. Other important considerations include the color rendering properties of the light source, the distribution of light within the space, and the visual comfort and safety of the occupants.
light output ratio ( LOR )
Luminaire Efficiency are quoted in terms of light output ratio ( LOR )
Downward Light output ration (DLOR) = Downward lumen output of luminarire / Total Lamp Lumen output
Upward LIght output ratio (ULOR) = Upward lumen ouput of luminaire / Total Lamp Lumen output
Light output ratio (LOR) = DLOR + ULOR
Light output ratio (LOR) is a measure of the effectiveness of a lighting system in delivering light output from the luminaire to the area being illuminated. It is expressed as a percentage and is calculated by dividing the total light output of the luminaire (in lumens) by the light output of the lamp (in lumens).
The light output of the lamp is the total amount of light that is produced by the lamp, while the light output of the luminaire is the amount of light that is actually emitted by the luminaire and reaches the area being illuminated. The LOR takes into account any losses that occur within the luminaire, such as those from the reflector, the lens, and other optical components.
A high LOR indicates that more of the light produced by the lamp is being delivered to the area being illuminated. This is important because it means that less energy is wasted as heat and more energy is being used to produce useful light. A higher LOR can also result in lower operating costs and reduced energy consumption.
LOR is an important parameter to consider when designing a lighting system because it can have a significant impact on the energy efficiency and effectiveness of the system. However, it should be noted that LOR is just one of many factors to consider, and other factors such as color rendering index (CRI), illuminance, and uniformity of light distribution should also be taken into account.
Illumination in architecture – home page
FD Architect Community Forum Discussion
- Illumination – introduction
- Basic Terminology and Definitions
- Laws of Illumination The Inverse Square Law of Illuminance Illuminance (E) at any poi
- Laws of Reflection and Refraction
- Visual efficiency & comfort
- Day lighting
- Components of Daylight Factor
- Artificial Lighting Design
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