On small scale this difference is not too … The value of utilization factor depends upon: (i) The mounting height of lamps—utilization factor decreases with the increase in mounting height of lamps, (ii) Area to be illuminated—for given height, proportion of direct light becomes more and more if floor area increases, i.e., utilization factor increases with the increase in area to be illuminated, (iii) Type of lighting—more for direct lighting and low for indirect lighting and. Copyright 10. It is employed only in some special problems, such as flood lighting, yard lighting etc. 1) utilization factor: Utilization Factor or Co-efficient of utilization. The average illuminance value desired is determined according to the type of activity to be carried out inside the room. From the size of lamp or lamps employed and from their efficiency total lumens output are determined. The utilisation factor of a room can be affected and changed by several different components of the room. The utilisation factor method is used for an estimated calculation of lighting installations. The contents of a room, as well as the use of the room, determines how much lighting to use. A small assembly shop 16 m long, 10 m wide and 3 m up to trusses is to be illuminated to a level of 200 lux. If two and more than two lamps are illuminating the same working plane, the illumination due to each can be calculated and added. Take into account the size of the room and the brightness of each light you consider installing in the room, to ensure there is adequate lighting. In professional field proper lighting design is very important because an under lighting arrangement will decrease the efficiency of the task for which the lightings were designed and an over lighting arrangement will result in over expenditure of the company. The term utilisation factor in lighting refers to what percentage of the actual light physically reaches the surface of the room. How to Start and Control the Speed of Traction Motors? Reflective surfaces affect the utilisation factor because they increase the brightness of lighting. The method of calculating the utilization factor (UF) is detailed in lighting design books, although lighting manufacturers’ catalogues give factors for standard conditions. This method is applicable where the illumination at a point due to one or more sources of light is required, the candle powers of the sources in the particular direction under consideration being known. An illumination on the working plane of 75 lux is required in a room 72 m x 15 m in size. UF = Lumens received on Working Plan / Lumens output of luminaires. A retail store or office building is expected to be significantly brighter with more lighting than a home or a storage warehouse. Huge Collection of Essays, Research Papers and Articles on Business Management shared by visitors and users like you. Davis earned her Bachelor of Arts in communication with a concentration in journalism from Berry College in Rome, Ga. Higher the value of utilization factor, more lumens will reach the working plane for the given lumens output of the lamps. Designing the lighting in a new room involves more than just picking out a light fixture and plugging a few lamps into the wall. The illumination produced by a lighting installation is considerably less after a year or two of use than it was initially. If the lamps and surroundings are not perfectly clean, then in determination of lumens received on working plane, the depreciation factor or maintenance factor should be included, i.e.. Also Lumens received on working plane = Number of lamps x wattage of each lamp x efficiency of each lamp in terms of lumens per watt x coefficient of utilization x maintenance factor. The ratio of lumens reaching the working plane to the total lumens given out by the lamp or lamps, is known as utilization factor or coefficient of utilization. Assuming a suitable space- height ratio, a utilization factor of 0.5, a lamp efficiency of 14 lumens per watt and a candle power depreciation of 20%, estimate the number, rating and disposition of lamps. This method is applicable to those cases where the sources of light are such as to produce an approximate uniform illumination over the working plane or where an average value is required. Higher the value of utilization factor, more lumens will reach the working plane for the given lumens output of the lamps. Calculate the number of lamps required to illuminate the whole area if the lumen output of the lamp selected is 3,000 lumens. Your email address will not be published. The utilisation factor method is based on the fact that the average horizontal illuminance for a room of a specific size can be calculated using the … The number of luminaires required to obtain the desired value of illuminance is calculated with the formula: To get a better&accurate result, we suggest using Dialux software to make a lighting simulation. The UF is … say 0.6. Utilisation factor is affected by the size of the room. Disposition of lamps is shown in Fig. Point to Point or Inverse-Square Law Method. (iv) Colours of surroundings etc.— more for light colours and less for dark colours. Reflectance factors: these are the reflectance factors of the ceiling, frieze, walls and work plane and are to be considered as percentages multiplied by 10 (example 80%, 70%, 70% and 30%), Room Index K (example 0.6): the room index is a factor that considers the dimensions of the room under examination, Utilization Factors (example 340): these factors consider the amount of flux emitted by the luminaires falling on the work plane. | Electrical Engineering, Unconventional Machining Processes: AJM, EBM, LBM & PAM | Manufacturing, Material Properties: Alloying, Heat Treatment, Mechanical Working and Recrystallization, Design of Gating System | Casting | Manufacturing Science, Forming Process: Forming Operations of Materials | Manufacturing Science, Generative Manufacturing Process and its Types | Manufacturing Science. It is important to understand the utilisation factor of your lighting when you install lights in a room, so you know how much lighting you need. The utilization factor tables are useful for determining the number of luminaires of the same kind to be used within the room given an average illuminance value. The larger the room, the smaller the utilisation factor for each light. It is important to understand the utilization factor of your lighting when you install lights in a room, so you know how much lighting you need. Darker colours do the opposite and draw in light, making rooms seem darker, which reduces the utilisation factor. Jen Davis has been writing since 2004. Reflective surfaces include mirrors, glass and wall paint. The utilisation factor of a room can be affected and changed by several different components of the room. Area to be illuminated, A = 100 x 10 = 1,000 m2, Total lumens required = A x E = 1,000 x 80 = 80,000. The utilization factor of a room can be affected and changed by several different components of the room. Required fields are marked *. 7.46. The lighting manufacturers’ catalogues give Utilization Factors for standard conditions. The utilisation factor of the lights affects how the lighting in your home is perceived, as well as the total effectiveness of the lighting arrangement. Disposition of lamps is shown in Fig. How to do Lighting Design Calculation in a Building – Electrical Wiring Installation . Multiplying the total lumens output from the source by coefficient of utilization, the lumens received on the working plane are determined. Its value varies from 0.25 to 0.5 and from 0.1 to 0.25 for direct and indirect lighting schemes respectively.

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