If you are looking for the LED High Bay Lights solution, please don’t hesitate to ask us. The term utilisation factor in lighting refers to what percentage of the actual light physically reaches the surface of the room. 1. 1) utilization factor: Utilization Factor or Co-efficient of utilization. The room index corresponding to the room is calculated by means of the formula: 3. Change a Recessed Light Bulb on a High Ceiling, ND Light: Lighting Calculations and Formulas. The lamps are required to be hung 4 m above the work bench. Just give us the dimension of the room and your required lux level on the work plane and we will make a lighting simulation test for you in a very short time. A retail store or office building is expected to be significantly brighter with more lighting than a home or a storage warehouse. A minimum illumination of 80 lumens/m2 is required in a factory shed of 100 m x 10 m. Calculate the number, location and the wattage of the units to be used. Coefficient of Utilization or Utilization Factor: The whole light radiated by the lamps does not reach the working plane. 2. 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. This fact is taken into account by including the maintenance factor, which is defined as the ratio of the ultimate maintained metre-candles on the working plane to the initial metre- candles. UF = Lumens received on Working Plan / Lumens output of luminaires. Copyright © 2010-2020 Fireflier Lighting Limited. If two and more than two lamps are illuminating the same working plane, the illumination due to each can be calculated and added. 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. The term utilisation factor in lighting refers to what percentage of the actual light physically reaches the surface of the room. Your email address will not be published. It consists in making an allowance of watts per square metre of area to be illuminated according to the illumination desired on the assumption of an average figure of overall efficiency of the system. Prohibited Content 3. Disposition of lamps is shown in Fig. 7.46. 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. Point to Point or Inverse-Square Law Method. Step 1: Understand the utilization factor table that is available on most fittings. This method is not much used because of its complicated and cumbersome applications. Utilization Factor is Proportion of light reaching working plane to the light output of lamps. Multiplying the total lumens output from the source by coefficient of utilization, the lumens received on the working plane are determined. Davis earned her Bachelor of Arts in communication with a concentration in journalism from Berry College in Rome, Ga. Utilization factor (UF) The light flux reaching the working plane is always less than the lumen output of the lamp since some of the light is absorbed by the various surface textures. Lumen or Light Flux Method 3. 80 lamps in 4 rows, each row having 20 lamps, can be used giving spacings of 3.6 metres in length and 3.75 metres in width and space- height ratios of 0.9 and 0.9375 respectively. 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 method of calculating the utilization factor (UF) is detailed in lighting design books, although lighting manufacturers’ catalogues give factors for standard conditions. 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 … Wattage of each lamp = 14,464/80 = 180.8 ≃ 200 W (say) Ans. [gravityform id="1" title="false" description="false" ajax="true"]. Plagiarism Prevention 5. 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. Total lumens required = E x A = 200 x 160 = 32,000 lumens. It is used to calculate the number of luminaires required for the target illuminance on the working plane or the illuminance achieved by a specified number of luminaires. 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. The utilization and maintenance factors are 0.74 and 0.8 respectively. Image Guidelines 4. Your email address will not be published. Uploader Agreement. Its value is more if the lamp fittings are cleaned regularly, say 0.8, and less if there is much dust etc. This is principally a “rule of thumb” method, very handy for rough calculation or checking. It is employed only in some special problems, such as flood lighting, yard lighting etc. Account Disable 12. Save my name, email, and website in this browser for the next time I comment. Huge Collection of Essays, Research Papers and Articles on Business Management shared by visitors and users like you. Its value is more than unity. 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. 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. When you add lighting or change the lighting in your home, several different factors should be taken into consideration. a and b are the length and width of the room; Hu is the working height understood as being the distance between the work plane and the luminaire, F = total flux of the individual luminaire in [lm]. The lighting manufacturers’ catalogues give Utilization Factors for standard conditions. She has served as a newspaper reporter and her freelance articles have appeared in magazines such as "Horses Incorporated," "The Paisley Pony" and "Alabama Living." Calculate the number of lamps required to illuminate the whole area if the lumen output of the lamp selected is 3,000 lumens. The larger the room, the smaller the utilisation factor for each light. 7.45. (iv) Colours of surroundings etc.— more for light colours and less for dark colours. How to do Lighting Design Calculation in a Building – Electrical Wiring Installation . Reflective surfaces affect the utilisation factor because they increase the brightness of lighting. Reflective surfaces affect the utilisation factor because they increase the brightness of lighting. Required fields are marked *. Its value varies from 0.25 to 0.5 and from 0.1 to 0.25 for direct and indirect lighting schemes respectively. Content Filtration 6. 42 lamps of 150 W rating in 2 rows, each row having 21 lamps, can be used giving spacing of 4.76 m in length and 5 metres in width. How to Start and Control the Speed of Traction Motors? This is merely the inverse of the maintenance factor and is defined as the ratio of the initial metre- candles to the ultimate maintained metre-candles on the working plane. Assume that the depreciation factor is 0.8, coefficient of utilization is 0.4 and efficiency of the lamp is 40 lumens/watt. 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. Before uploading and sharing your knowledge on this site, please read the following pages: 1. The average illuminance value desired is determined according to the type of activity to be carried out inside the room. Area to be illuminated, A = 72 x 15 = 1,080 m2, Total lumens required = A x E = 1,080 x 75 = 81,000, Maintenance factor = 1 – candle power depreciation = 1 – 0.2 = 0.8.
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