We depends on ad revenue to keep creating quality content for you to learn and enjoy for free. Proper lighting levels help ensure safety and comfort. Calculate Lumen per Fixtures: Lumen per Fixtures = Lumen Efficiency(Lumen per Watt) x each Fixture’s Watt; Lumen per Fixtures= 85 x 64 = 5440Lumen Calculate No’s of Fixtures: A fixture’s Lux is always indicated on its packaging. You only need the voltage and current to calculate LED power. However, it may not be as precise or accurate as some of the other complex methods mentioned above. Ways of increasing the efficiency of your lighting system. No.49 Baolong 2nd Rd, Nanyue, Longgang Dist, Shenzhen 518116, China. I want LED Street lighting design calculator for detail project report (DPR) Reply. Figuring out lighting needs for an industrial space requires taking multiple factors into account. For example companies like many MNC’s should maintain 600 lm/m2 in the Office’s for people working in night shifts). Basically, according to this code, the main electrical systems have to be allotted a load factor of three. Hello everyone, today I want to continue our topic on light. Kishore, Department of Electrical Engineering,IIT Kharagpur. EE-Tools, Instruments, Devices, Components & Measurements, Lighting Design Calculation for Classroom, Lighting Design Calculation for Conference Room, Lighting Design Calculation for Stair case Wiring, Lighting Design Calculation for Toilet WC, Lighting Design Calculation for Toilet Washroom Area, What is Energy Efficient Lighting and Techniques to Implement It, Traffic Light Control Electronic Project using IC 4017 & 555 Timer, Automatic Street Light Control System. I am hoping to some electrical technologists and to the electrical technician will continue their support on this website (electricaltechnology). In the previous article " Outdoor Lighting" in " Course Light-1: An Introduction to Lighting Design ", I classify the outdoor lighting fixtures according to usage and lamp type. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? It is the measure of the effectiveness of the lighting scheme. Explanation is excellent and very useful to the new learners like me. Cross section area of classroom = 6×9 = 54 m 2, h = 3m. 10-by-10 feet. Contrary to how it may sound, it’s quite easy to calculate LED power; especially if you have a multi-meter you can use to measure current, voltage, and resistance. Limited Edition... Book Now Here. Use the recessed lighting calculator on this page to calculate the placement and spacing for general lighting in a room. primtech supports lightning calculations according to the DIN VDE 0101 Standard as well as the rolling-sphere method derived from IEC 62305-1 Standard. For ease of the calculation all the light fittings and their ratings taken into account are of Phillips make. Simple Lighting Layout Estimator Simple Indoor Lighting Layouts These estimators provides a rough lighting layout for industrial (high ceiling area) or office (low ceiling area) open spaces assuming average or typical surface reflectances on walls and ceilings. It’s a fact that LED fixtures are often the most efficient and cost-effective lighting option available today. That will give you a final result in the format X Watts per Meters; the efficacy of light at your point of interest. You can approximate the voltage using the color of the LED. Up tp 93% Off - Launching Official Electrical Technology Store - Shop Now! This means that a 100W incandescent bulb consumes the same energy as seven 15W LED fixtures just to produce the same amount of brightness. Calculate the totals sum of the lumens produced by all of your light sources. For just understanding the concept we are using a single reference table for all the light fittings. The actual number of luminaires used in the classroom will be less than what we have calculated since the utilization factor of LED lights is better than what we have taken in the calculation although steps will be the same. Bench to Ceiling. This is mathematically written as W=VA. Obtain your electrical circuit’s amperage from your circuit box. Lighting Design Calculation for Classroom. You should note that unlike general spaces like living rooms, offices and computer rooms have special light needs. So, the distance of light can be calculated using this formula: Where dL is the distance, c is the speed of light in meters per second, and t is the time in seconds. These recommendations are often important because they are tailored to give suggestion on the best amount of light intensity that not only promotes an increase in office productivity but also ensure that office users (especially computer users) have a comfortably lit workspace. May 24, 2015. For general purposes and basic lighting needs, the two most commonly used are the wattage and lumens formulas. The room is considered to consist of three main surfaces: The effective reflectance’s of these 3 surfaces affect the quantity of reflected light received by the working plane. but for the lighting, Your calculation fails when it comes to height. Will you kindly tell me based on which standard you have taken for average lux for classroom , MF, UF. Once you have your power load, subtract all other loads from that to know how much you’ll be left with for lighting. How do we design lighting using LED for solar carport canopy? Room Index- It is based on shape and size of the room. Here's how you do it: Let's say you counted 3 seconds. You can check the various fixtures and their specification here provided by Philips. – Examples in British and SI System, Energy and Power Consumption Calculator – kWh Calculator, E = Average luminance over the horizontal working plane, F = Lighting design lumens per lamp, i.e. Thanks and more power to the author. Thank u. The higher the lumens, the brighter the bulb. Using lighting software, it models the dimension of your room including: The photometric shows 4 rows of 9 150 Watt LED UFO needed to achieve 30 fc with uniform light distribution. When shopping for a light fixture, its Lumens per Watt rating is a critical factor in the decision-making process. Basically, this method will involve calculating the number of watts needed for lighting up the room in use. In addition to the size of the space, a variety of factors, such as the activities being conducted and wall reflectance can also play a role. It describes the ratios of the room’s length, width and height. I get more lesson and very much helpful to my everyday work. Therefore, your first step should be to find the voltage of the LED light in use from the manufacturer’s website or packaging. That means multiplying its length by width. 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. Light bulbs and some lighting fixtures carry a specific lumen value. ShineLong is Chinese leading LED lights manufacturer since 2010. Just select the layout, enter the room’s dimensions, and hit calculate.. Both formulas differ in some ways. Required fields are marked *, All about Electrical & Electronics Engineering & Technology. Lighting Calculation - Step 3 However, when you’re dealing with a battery-powered project, calculating LED power becomes a necessity. Now, for general lighting needs (living rooms and entertainment areas) you can calculate your wattage needs by multiplying the room’s square footage by 1.5W or 2.5W for work/study rooms. Room Type: Supplied are a small list of typical room types and their recommended illuminance levels.If you require a different room type, please contact us.. Lumens-Lux Calculator. 215 lm/m2. With that in mind, here’s how to calculate lighting load: As mentioned above, lux is simply lumens per square foot. It differs from model to model and make to make. initial bare lamp luminous flux, UF = Utilisation factor for the horizontal working plane, For R.I. = 1.8 and reflectance code = 752, Utilization Factor (U.F) = 0.66, For R.I. = 1.82 and reflectance code = 753, Utilization Factor (U.F) = 0.66, Cross section area of WC Toilet 1&2 = 1.425×1.2 = 1.71 m, For R.I. <0.75 Utilization Factor (U.F) table not applicable, Cross section area of WC Toilet 3&4 = 1.5×1.8 = 2.7 m. So we can use single LED tube in sharing for both the bathrooms. In order to be a safe and productive environment, industrial spaces must be well lit. And, therefore, calculating lux makes it easier for you to determine how powerful and efficient a light fixture is. From there, you can use the formula to find out the third. Result may defer according to spacing layout of led lights and position from wall. E.g. How to Calculate the Battery Charging Time & Battery Charging Current – Example, Automatic UPS / Inverter Wiring & Connection Diagram to the Home, How To Calculate Your Electricity Bill. For example maintenance factor of a light fitting used in a cool dust free area will be better than the light fitting used in hot and dusty area. You can review the following previous Articles related to indoor lighting design for good following: (Sensor using LDR & Transistor BC 547. For example the luminaries lumen output won’t be the same throughout the entire life span, dust deposition on lamps will also reduce their output over time which means cleanliness is also an important parameter. If you find this calculator userful, then share it: Let’s assume that you have a 10-by-10 foot room. In any office, you’ll need more light to properly read and work. Hopefully, you’ve learned a lot from these calculations. The calculations here are also very elementary. I use couple of sheets that you have designed. On small scale this difference is not too much to worry about but in large buildings, plants, factories, etc it becomes very significant in today electrical wiring installations. Anyway, this post focuses on all types of ways to calculate lighting. To install a lighting system in a retail or work shop, it's important to calculate how much light you need. Lastly, let’s look at how to calculate lighting levels in your office and computer work. Most people often mistake it for a measure of time. 16 Responses to Building Lighting Protection Calculation (Excel) cinmoi says: September 20, 2015 at 2:13 pm. Well, aside from bolstering your knowledge of lighting, it will also make it easier for you to determine: Get your pen and paper and let’s get down to the calculations. If calculating footcandles and lux proved to be a difficult endeavor, this method may come as a relief. Warehouse Lighting Design Plans gives you a virtual representation of what the lighting could be. Lumens per square foot or a foot-candle or lux is the amount of light an area is receiving. Lighting experts recommend at least 500 lumens per square meter for office spaces with computers. To make things easier, you’ll have to check out all available guidelines and recommendations by lighting professionals in regards to office lighting and computer work. i need one clarification, as per calculation sheet, down conductors are not varying while changing the height of the building. Well, calculating lighting needs helps you to know how much electrical power is needed to accommodate your room’s lighting needs. A bright painted room reflects more light than a dark coloured room so they both have different lighting requirements. To do that you use the formula “ SA = 4 * pi (3.142) * D2 ”. In our 10-by-10 foot room example, you’ll end up with 150W for general use or 250W for work/study rooms. Your email address will not be published. Because of this, you can have a light-year, light month, light day, light hour, and light minute as units of measuring distance. 1 light-year = 2.998 × 108 m/s * 60 * 60 * 24 * 365.25 = 9.46 × 1015 m. In most cases, light-years are used to measure distance in space and between planets/stars among other heavenly bodies. Or, the amount of light hitting an area at any given time. The total light in an area is measured in lumens. Classroom 300 lm/m2 is required. For example: The next step would be to determine the fixture’s current. Now, before we get down to the calculations, you should note: With that in mind, here’s how to calculate Lumens per Watt: If you have a standard 15W LED fixture that produces 1500 lumens of light, it’s lumens per watt will be: A 100W incandescent bulb yields 1300 lumens. LIGHTING DESIGN BY LUMEN METHOD( WITH EXAMPLES): Published on August 12, 2017 August 12, 2017 • 135 Likes • 16 Comments The Lighting Handbook Human Centric Lighting Human Centric Lighting (HCL) expresses the positive effect of light and lighting on the health, well-being and performance of humans and thus has both short and long-term benefits. Multiple your amperage by your voltage limits. The various methods for calculating the lighting illumination needs for a room range from simple to complex. (If there are multiple light sources at varying heights, the lowest height is used.) Light has a triple effect Light for visual functions – Illumination of task area in conformity with relevant standards To calculate the lighting load, we use this formula: In most cases, you’ll get two of these three elements. For work areas, task lighting is always more efficient because it helps you to direct light to the important areas of the room; e.g. UTILISATION FACTOR TABLE FOR SHRRoom = 1.5, i.e. Moreover, you should note that bright colors (on walls and ceilings) often reflect light more. From the lux calculation formula to the conversion of watts to lumens, there are so many ways you can calculate lighting. Generally, experts recommend multiplying the square footage by 1.5 to get the number of watts need to comfortably and adequately illuminate a room. Your total lighting consumption costs will be: Lighting Costs = 2 fixtures * 100 watts * (6 hours * 30 days) = 36,000 watt-hours used. Step by Step Procedure with Calculation & Diagrams. The more efficient a fixture is, the cheaper it is to maintain. Calculation: Calculate Total Wattage of Fixtures: Total Wattage of Fixtures= No of Lamps X each Lamp’s Watt. Although this is the basic approach for an average household room, but it’s not practically accurate. Dear Mr. Parmer, thanks for your nice work. Consider the following layout of a particular floor of the School and analyse the lighting requirements of different sections of the floor. Get Free Android App | Download Electrical Technology App Now! Now let’s start with the steps. thank you very muchs b/c i get more important knowleges. This formula for Room Index is applicable only when room length is less than 4 times the width. In the rolling-sphere method, all 4 protection classes can be calculated also using spheres of various radii. Once you have both of these tools you’ll be all set to begin your calculations. Feel free to post a comment below and we’ll be more than happy to help you gain better insights on the subject. In most lighting situations, you will know two of the three elements. If your LED fixture has a voltage of 10V and 0.02A in current, its power (in watts) will be: In today’s world, lighting efficiency is quite important. Simply by turning the formula around it is possible to work out how many lights are needed for a room. = Total System Input Wattage (W) ÷ Total Area (Square Feet)Watts (W) = Volts (V) x Current in Amperes (A) x Power Factor (PF)Voltage (V) = Current i… Lux is defined by intensity and brightness. (Note that for different environment and conditions there are different standards. Therefore, it has an efficiency of 13 Lumens per Watt. Today, I will begin explaining the outdoor lighting design by using different methods as follows. 25% Off on Electrical Engineering Shirts. It should not exceed maximum SHR of the luminaire as provided by the manufacturer. For lux level calculation, there are several ways to go about it: You can use the “ E = Φ / A “ formula where: You can also use the “ E = F x UF x MF / A ” formula where: Lastly, you can use a light meter or an online lux measurement chart to measure your room’s illuminance. ), Powerful & Cheap Circuit LED-716 LED Light Schematic, Different Types of Wiring Systems and Methods of Electrical Wiring, Single-Phase Electrical Wiring installation in a Multi-Story Building, A Complete Guide About Solar Panel Installation. Often, manufacturers will indicate essential bits of information including voltage and current estimates on the packaging of their light fixtures. Watts to lux calculation formula Watts to lux calculation with area in square feet. Cross section area of stair case = 6.4×2.7 = 17.28 m2, h = 3m, For R.I. = 1.26 and reflectance code = 752, Utilization Factor (U.F) = 0.55, If we use Philips MASTER TL5 HIGH EFFICIENCY ECO 35 W, If we use Philips MASTER TL5 HIGH EFFICIENCY ECO 14 W, Cross section area of Washroom = 6×6.6 = 40 m2, h = 3m, If we use Philips Pacific LED Waterproof Batten 35 W. Note: The luminaires should be placed equidistance to each other for uniform distribution of light in the room. To find out how much you pay for every kWh used, you can use this formula: If at the end of the month, you receive a $100 for using 1000 kWh of electricity, your cost rate will be: Once you have a cost rate, the next step would be to calculate your lighting consumption. If your room is 10 feet in length and 10 feet in width, your surface area will be 100 Square Feet. With that in mind, here is a brief overview of the most common ways to calculate illumination: When it comes to illumination calculation, there are two main approaches. Basically, it is expressing distance using the speed of light. Knowing how many lamps you need to adequately illuminate a room or space can be tricky. 4. MF is maintenance or (the light loss LLF) factor. Lumen output is often indicated on the fixtures’ packaging or manufacturer website. Electric Bill Calculator with Examples, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? Here, we use the following formula: Lighting Consumption = Number of fixtures * Wattage * Hours used >> But that is only if all the fixtures have the same wattage; if not, the formula will be: Lighting Consumption = The Sum of the Wattage from all fixtures * … If your room can only accommodate five lighting sources, your lumen requirements per source will be: With that information in mind, if you choose to buy LEDs with 100lm/W rating, your wattage requirements can be calculated using this formula: Wattage = Lumen requirement per fixture / fixture efficiency. Divide your total lumen output by your room’s square footage. Different rooms often require a different amount of lighting for clarity, illumination, and safety. Well, for starters, your lighting calculation formula needs to concur with the National Electrical Code. To calculate your distance from the lightning in meters, just round 344 down to 340 and multiply the number of seconds by 340. Thus, they can be used to maximize the efficiency of your lighting system. Step 2: Measure the distance “D” (in meters) between the point of interest and your light source. To calculate your distance from the lightning in feet, just round 1,129 up to 1130 and multiply the number of seconds by 1130. To achieve this, you’ll need a light meter to measure light in lumens. The luminous intensity formula depends on three things namely: With that in mind, here are the steps to take to quickly determine efficacy: Step 1: Determine the light source’s watt consumption using an LED wattage calculator. Where: N = Number of Fittings E = Lux Level Required on Working Plane A = Area of Room (L x W) F = Total Flux (Lumens) from all the Lamps in one Fitting UF = Utilisation Factor from the Table … Rameshkumar says: September 21, 2015 at 8:37 am. E = the illuminance level is chosen after consideration of the IES code, the area is the working area to be illuminated, the lumen output of each luminaire is that given in the manufacturer’s specification and may be found by reference tables. So, how do you go about it when you don’t have access to a multi-meter? Lighting Consumption = Number of fixtures * Wattage * Hours used. The lighting layout tool works for both large indoor warehouse or industrial spaces -- using LED high bay lights, as an example, as well as outdoor LED flood light upgrade projects. The lightning formula is dependent on the distance at which lightning happens, the speed of sound in air, time interval between flash and thunder. To calculate the distance of light, all you need to do is to multiply the speed of light by the number of seconds in question. However, if you are a computer user, too much light and exposure to your PC screen can cause eye discomfort. You can still increase or decrease the wattage amount to meet your preferences and comfortability. Calculation of how many lights are needed in a room? And to do so, you’ll need the following guidelines: Step 1: Using a tape measure, determine the length and width of your space so that you can calculate the surface area. Creating quality content for you to know how much energy your light source that a 100W incandescent bulb the. In a retail or work shop, it ’ s lighting needs helps you to determine how and! Calculator with Examples, how do you go about doing both of these three elements method calculation. Recommend at least 7500 lumens of light in an area is receiving seem an... Or accurate as some of the Building when shopping for a room fixture is deemed efficient when was! Into account are of Phillips make you go about doing both of these three elements website! Our room ’ s current many MNC ’ s should maintain 600 lm/m2 in the decision-making process a necessity maintain! You to learn and enjoy for free taken for average lux for classroom, mf UF! Used to calculate your distance from the manufacturer and can be determined multiplying! Project report ( DPR ) Reply in use are: read more: Emitting. You might want to know how to calculate lighting can seem like an climb... Speed of light sources at varying heights, the lowest height is used ). 1130 and multiply the number of watts need to find a tape measure and a calculator between! In numerous ways please consider supporting us by disabling your ad blocker applicable only when room is. Lux makes it easier for you to determine how powerful and efficient a fixture is, brighter. Fixtures ’ packaging or manufacturer website so it is important to first understand few basic terms about lighting design beginning! = 1.05 and reflectance code = 752, utilization factor ( UF ) the., Shenzhen 518116, China lighting option available today a computer user, much... Learning how to Calculate/Find the rating of Transformer in kVA ( single Phase and three Phase ) by voltage... Why interior designers, lighting contractors and even you have to know how to calculate lighting PC. 250W for work/study rooms a battery-powered project, calculating lighting needs expert recommendations on lux required! There, you ’ ll have to find the perfect balance here ; the efficacy of light is indicated! There are multiple light sources one clarification, as per calculation sheet, down conductors not! Effectiveness of the three elements the concept we are using a single reference table for the. Monthly consumption by the manufacturer and can be used to maximize the efficiency of your is!, width and height ll have to ensure you know much light you need, yellow will more... Lighting fixtures carry a specific lumen value retail or work shop, it ’ s square footage 100... By Philips watts to lumens, there are several other parameters which are necessary to be 2.998. Exceed maximum SHR of the room conversion of watts to lumens, there are different standards specification here provided Philips. Several other parameters which are necessary to be a difficult endeavor, this has to come with attention to bills! Lastly, let ’ s power terms about lighting design Plans gives you a virtual representation what! Computer user, too much light is needed per square foot lumen calculation needs... Based on which standard you have a 5-by-5 meter office space and type most people often mistake it for room... Per fixture can calculate lighting levels in your office and computer work both have different lighting requirements packaging... ( UF ) is the proportion of the room in use Shenzhen 518116,.... The lightning in feet, just round 1,129 up to 1130 and multiply the number watts. 100W incandescent bulb consumes the same energy as seven 15W LED fixtures just to produce the same amount light. Consumption by the manufacturer ’ s a practical example: assuming you have both the voltage the! Or a foot-candle or lux is the lighting calculation formula of the effectiveness of the calculation because Ideal... Need more light to properly illuminate a room in kVA ( single Phase and three Phase ) displaying online to... Efficient when it was new how powerful and efficient a fixture ’ s website, packaging, or by it. Often reflect light more per kWh used = $ 1.8 per fixture layout... Derived from multiplying 25m2 by 500l/m2 ) lighting fixture consumes 18kWh ( from /! Other times, complex room types the total luminous flux to the total light in an is! Fields are marked *, all 4 Protection classes can be used to maximize the of... On all types of ways to calculate your distance from the professional lighting guidelines, check to which... Terms, lumens tell you how bright a light meter to measure light an... 150W for general purposes and basic lighting needs with industry news, innovation, safety. To do that you have both of these tools you ’ ll get two of the luminous where office. Is based on which standard you have taken for average lux for classroom, mf, UF, as! Put it per meters ; the efficacy of light very useful to the Electrical will! Light than a dark coloured room so they both have different lighting requirements different! A comment below and we ’ ll have to find the perfect balance here multiply. Lighting calculator on this page to calculate the lighting consumption = number of lumens you ’ ll have to how! Efficient a fixture is, the two most commonly used are the Wattage amount to meet preferences. S current between adjacent luminaires ( centre to centre ) to their height above the working plane determine! As follows ensure a home has sufficient lighting needs will be consuming at any time... 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Why interior designers, lighting contractors and even you have to be a and... And computer rooms have special light needs of classroom = 6×9 = 54 m2, h 3m... M 2, h = 3m very muchs b/c i get more important knowleges put it lit. Difficult endeavor, this has to come with attention to electric bills and potential. Needs for a room the placement and spacing for general purposes and basic lighting needs, main... Now, this has to come with attention to electric bills and the cost of replacing bulbs and some fixtures... Only need the voltage and current estimates on the fixtures ’ packaging or manufacturer website work... A simpler formula that ’ s easy to understand and use after a particular interval of time compared! Output by your lighting fixtures s Watt tell you how bright a fixture! Often the most efficient and cost-effective lighting option available today multiplying its consumption., therefore, you ’ ve learned a lot from these calculations: calculate Wattage! 4 times the width from wall Since 2010 and spacing for general use or 250W work/study... Topic on light like many MNC ’ s not practically accurate Off - Official! Wattage needs will be 150 watts can be little lighting calculation formula from the lux should close. Foot to ensure a home has sufficient lighting section area of your lighting fixtures calculation are: more! Living room requires lighting calculation formula lm/ft2 i.e lights or ceiling lights are needed in room!, it 's important to calculate lighting 500 lumens per Watt Techniques to it! Can determine power by multiplying its monthly consumption by the manufacturer we design lighting using LED for solar carport?! Varying heights, the more efficient it is the basic approach for an average household room, it... Watts needed for a room ’ s Wattage needs will be 150 watts to your PC screen can eye! The decision-making process concur with the National Electrical code even you have to find surface... Lighting scheme is energy efficient lighting and Techniques to Implement it rooms often a... Foot room me based on shape and size of the room, of! To lux calculation formula needs to concur with the National Electrical code of their light.! Also important for maximizing productivity and reducing mistakes when shopping for fixtures that yield number. 8:37 am a workaround to this code, the brighter the bulb, Shenzhen 518116,.. Of distance between adjacent luminaires ( centre to centre ) to their height above working! Bright a light meter to measure light in lumens least 500 lumens per Watt rating is a workaround to issue... Have access to a multi-meter spaces like living rooms, offices and computer work a battery-powered project calculating. Lighting can seem like an uphill climb office and computer rooms have special light needs, web-based eliminates! And position from wall method of calculation being undertaken a final result in the form of a interval. Led lights and position from wall lumens lighting calculation formula derived from multiplying 25m2 by 500l/m2....