What is maintenance factor and utilization factor?

November 3, 2020 Off By idswater

What is maintenance factor and utilization factor?

There are two important factors in the planning or designing of lighting Scheme. (1) Maintenance factors (MF) (2) Utilization factor (UF) Over time, they decrease due to degradation and failure of light sources, soiling of lamps and luminaires due to the reduced reflectance values of the room surfaces.

What is Lightlight factor?

waste light factor. Total lumens emitted by source / total lumens available after waste of light is equal to waste light factor. It is about 1.2 for rectangular area, 1.5 for irregular objects – statues, monuments etc. 140.

What is luminaire maintenance factor?

The luminaire maintenance factor LMF takes into account the reduction of luminous flux due to the soiling of the luminaire. It signifies the ratio of a luminaire’s light output ratios before and after cleaning. The LMF depends on the version of the luminaire and the related possibility of soiling.

How do you calculate plant factor?

Let us assume that the plant is operated through the day at its maximum loading i.e. 200 MW. Then the total energy that could have been generated will be equal to the 24×200 MWh = 4800 MWh (This is simple multiplication as the power output is assumed constant and time period is known).

How is luminaire spacing calculated?

How to Calculate Luminaire Spacing

  1. Measure the length and width of the area to be lit, then multiply the two numbers to calculate the square area.
  2. Divide the space’s square area by the number of luminaries to be installed.

Which type of lamp has highest illumination efficiency?

It’s an easy task to compare and see that LED light bulbs are truly the most energy-efficient. LED bulbs produce 90 to 112 lumens per watt. Compact Fluorescent Lamps produce 40 to 70 lumens per watt, and traditional incandescent bulb fixtures only produce 10 to 17 lumens per watt.

What are the examples of maintenance factor?

Example: If in a clean environment, such as an office, the walls are repainted every three years, the room maintenance factor is: 0.94 (the luminous flux decreases by a maximum of 6% until repainting).

What is maintenance factor?

Maintenance factor refers to the loss of light that occurs over time and is also known as loss factor. During the operating time of light sources, there can be a slight decrease of light output in other words lumen. In addition of this, pollution of light sources can also cause decreasing of light output.

What is high load factor?

A high load factor indicates that the load (energy being used) is using the electric system more efficiently, whereas consumers that underutilize the electric power distribution system will have a low load factor. The value of the Load factor will always be less than one.

How are luminaires selected in a lighting design?

Luminaires should be selected and the design completed with these elements in mind, where appropriate. After these criteria have all been considered, a lighting scheme calculation can be undertaken.

What is the maintenance factor of a luminaire?

Luminaire Maintenance Factor This is a ratio of the luminous flux after and before you clean. It largely hinges on the design and construction of the luminaire. Also, on ecological conditions too.

How are utilisation factors used in lighting calculations?

Utilisation factors show the proportion of the luminous flux from the lamp that reaches the working plan. This is for the specific luminaire and allows for surface reflectivity and Room Index. The UF is used in average lumen calculations to calculate the average illumination level for an area with a specific luminaire. Illuminance Cone Diagrams

Why are there so many luminaires on the market?

The luminaire’s function is to direct light to appropriate locations, without causing glare or discomfort. With thousands of different luminaires made by hundreds of manufacturers, there are more luminaires on the market than any other type of lighting equipment.