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Recommandé
Photometric & Testing Specialist 1255
Este documento describe una vacante para un especialista en fotometría y pruebas en una empresa líder del sector automotriz en Toluca, Estado de México. El puesto requiere asegurar la calidad de los productos mediante el seguimiento de planes de pruebas y programas de laboratorio, así como realizar calibraciones e instrumentos de medición. Se busca un ingeniero con conocimientos en validación de pruebas, metrología y calibración para garantizar que los productos cumplan con los requisitos del cliente.
Eco Lite Technologies - Manufacturers & Suppliers of LED Products
Eco lite technologies is the manufacturers of led products like led bulbs, led lights, led street lights, led mr16, led down lights, led bay lights. Each products of us are passed through various electrical parameters like electrical, thermal, optical, etc. before reaching to the customers. You can view and purchase wide variety of led products through our website http://www.ecolitetechnologies.co.in
PLS 2015: Lumen maintenance testing of outdoor lighting installations
PLS 2015: Lumen maintenance testing of outdoor lighting installationsInstitution of Lighting Professionals
Gareth investigates the current state of play regarding lumen maintenance testing of outdoor lighting. This paper presents an analysis of the current street lighting test methods and discusses some possible alternatives to the current procedures.
Talk by Dr Gareth John, Photometric and Optical Testing Services(5) bs-ii-electricity-unit-v-2012-five
The document discusses lighting calculation methods and standards. It provides the lumen method formula for calculating lighting levels: Lux x Area / Lumen Output x Maintenance Factor x Utilization Factor. It lists recommended illumination levels for various spaces from 50-1500 lux depending on the task. It also discusses controlling glare through limiting luminance of light sources, positioning luminaires out of the field of view, and maintaining small source sizes.
Street lighting
This document provides an overview of street lighting, including:
1) A brief history of street lighting from ancient times to modern high-intensity discharge lamps.
2) The key stages of a street lighting project including identifying lighting requirements, selecting technology, procurement, operation and maintenance, and evaluation.
3) Lighting requirements vary based on the type of area, such as central business districts, housing estates, industrial estates, and main/minor roads.
4) Common configurations include bridge, highway, intersection, roundabout, and underpass lighting. Definitions of key terms are also provided.
electrical lighting calculation
The document discusses lighting calculation methods and standards. It provides details on calculating illumination levels in lux based on the lumen method. Key factors discussed include lumens, utilization factor, and maintenance factor. Recommended illumination levels for offices are 500 lux for general tasks and 300 lux for less demanding tasks. Lighting system efficacy is defined as lumens per watt. Standards and guidelines suggest providing daylight where practicable but there are no absolute legal requirements.
Coefficient of utilization (cu)
This document discusses the coefficient of utilization (CU), which is a factor used to determine the efficiency of a lighting fixture in delivering light for a specific application. The CU is determined as the ratio of light output from the luminaire that reaches the workplane compared to the total light output of the lamps. Factors like the luminaire design, geometry of the space, and surface reflectances influence the CU. To calculate the CU for a space, you determine cavity ratios, effective ceiling and floor reflectances, and select the appropriate CU value from the luminaire manufacturer's data based on the room cavity ratio. An example calculation is provided.
Calculations of illumination
This document discusses methods for calculating illumination levels. It introduces the lumen method and point method. The lumen method calculates illuminance based on the total lumens of a light source and area of the surface. The point method calculates illuminance based on light intensity and distance. The zonal cavity method is introduced as an application of the lumen method for interior spaces. It includes coefficient of utilization and light loss factors to account for light lost from the source and room characteristics. Correction factors are needed because not all light reaches the surface and light output decreases over time.
Recommandé
Photometric & Testing Specialist 1255
Este documento describe una vacante para un especialista en fotometría y pruebas en una empresa líder del sector automotriz en Toluca, Estado de México. El puesto requiere asegurar la calidad de los productos mediante el seguimiento de planes de pruebas y programas de laboratorio, así como realizar calibraciones e instrumentos de medición. Se busca un ingeniero con conocimientos en validación de pruebas, metrología y calibración para garantizar que los productos cumplan con los requisitos del cliente.
Eco Lite Technologies - Manufacturers & Suppliers of LED Products
Eco lite technologies is the manufacturers of led products like led bulbs, led lights, led street lights, led mr16, led down lights, led bay lights. Each products of us are passed through various electrical parameters like electrical, thermal, optical, etc. before reaching to the customers. You can view and purchase wide variety of led products through our website http://www.ecolitetechnologies.co.in
PLS 2015: Lumen maintenance testing of outdoor lighting installations
PLS 2015: Lumen maintenance testing of outdoor lighting installationsInstitution of Lighting Professionals
Gareth investigates the current state of play regarding lumen maintenance testing of outdoor lighting. This paper presents an analysis of the current street lighting test methods and discusses some possible alternatives to the current procedures.
Talk by Dr Gareth John, Photometric and Optical Testing Services(5) bs-ii-electricity-unit-v-2012-five
The document discusses lighting calculation methods and standards. It provides the lumen method formula for calculating lighting levels: Lux x Area / Lumen Output x Maintenance Factor x Utilization Factor. It lists recommended illumination levels for various spaces from 50-1500 lux depending on the task. It also discusses controlling glare through limiting luminance of light sources, positioning luminaires out of the field of view, and maintaining small source sizes.
Street lighting
This document provides an overview of street lighting, including:
1) A brief history of street lighting from ancient times to modern high-intensity discharge lamps.
2) The key stages of a street lighting project including identifying lighting requirements, selecting technology, procurement, operation and maintenance, and evaluation.
3) Lighting requirements vary based on the type of area, such as central business districts, housing estates, industrial estates, and main/minor roads.
4) Common configurations include bridge, highway, intersection, roundabout, and underpass lighting. Definitions of key terms are also provided.
electrical lighting calculation
The document discusses lighting calculation methods and standards. It provides details on calculating illumination levels in lux based on the lumen method. Key factors discussed include lumens, utilization factor, and maintenance factor. Recommended illumination levels for offices are 500 lux for general tasks and 300 lux for less demanding tasks. Lighting system efficacy is defined as lumens per watt. Standards and guidelines suggest providing daylight where practicable but there are no absolute legal requirements.
Coefficient of utilization (cu)
This document discusses the coefficient of utilization (CU), which is a factor used to determine the efficiency of a lighting fixture in delivering light for a specific application. The CU is determined as the ratio of light output from the luminaire that reaches the workplane compared to the total light output of the lamps. Factors like the luminaire design, geometry of the space, and surface reflectances influence the CU. To calculate the CU for a space, you determine cavity ratios, effective ceiling and floor reflectances, and select the appropriate CU value from the luminaire manufacturer's data based on the room cavity ratio. An example calculation is provided.
Calculations of illumination
This document discusses methods for calculating illumination levels. It introduces the lumen method and point method. The lumen method calculates illuminance based on the total lumens of a light source and area of the surface. The point method calculates illuminance based on light intensity and distance. The zonal cavity method is introduced as an application of the lumen method for interior spaces. It includes coefficient of utilization and light loss factors to account for light lost from the source and room characteristics. Correction factors are needed because not all light reaches the surface and light output decreases over time.
Illumination model
An illumination model, also called a lighting model and sometimes referred to as a shading model, is used to calculate the intensity of light that we should see at a given point on the surface of an object.
Surface rendering means a procedure for applying a lighting model to obtain pixel intensities for all the projected surface positions in a scene.
A surface-rendering algorithm uses the intensity calculations from an illumination model to determine the light intensity for all projected pixel positions for the various surfaces in a scene.
Surface rendering can be performed by applying the illumination model to every visible surface point.
ILLUMINATION & LIGHTING
This document discusses illumination and lighting schemes. It begins with an introduction to artificial lighting and important terminology like luminous flux and illumination. It then describes different lighting schemes including direct, semi-direct, semi-indirect and indirect lighting. It also discusses the design of indoor lighting schemes and different types of lamps such as incandescent, halogen, discharge and fluorescent lamps. Finally, it covers topics like industrial lighting, street lighting and references used.
Laws of illuminations
This document discusses two laws of illumination: 1) The Law of Inverse Squares, which states that the intensity of illumination from a point source decreases inversely with the square of the distance from the source. 2) Lambert's Cosine Law, which states that the illumination at a point on a surface is proportional to the cosine of the angle between the normal to the surface and the direction of the light. It also provides background on units of measurement for light intensity, illuminance, and how photometric benches can be used to measure the candlepower of lamps.
Illumination basic and schemes
This document provides an overview of various types of electrical lighting sources and illumination concepts. It discusses the basic terms used in illumination like luminous flux, lumen, candle power, and inverse square and Lambert's cosine laws. It then describes different electrical light sources including incandescent, fluorescent, mercury vapor, sodium vapor, neon and halogen lamps. For each light source, it explains the working principle, construction details, advantages and applications. The document serves as a useful reference for understanding various electrical lighting techniques and concepts of illumination.
Road Lighting
Photometric
Road Class
MOT / Municipality
Recommendation
New Trends
Closing
The document discusses road lighting in Saudi Arabia and provides information on:
1) Key lighting terminology such as luminous flux, luminous intensity, illuminance, and luminance as well as the relationships between these terms. It also presents some basic lighting formulas.
2) Methods for calculating illuminance and luminance levels on roads using photometric data and factors like pole height, pole spacing, and light loss.
3) Saudi road classification systems from the Ministry of Transportation and municipalities and recommended lighting schemes from Saudi Lighting Company.
4) Trends in new road lighting technologies and references
Illumination - Method of calculation
There are three main methods for lighting calculations: 1) Watts per square meter, 2) Lumen or light flux, and 3) Point to point or inverse square law. The lumen method is used to estimate illumination patterns from diffuse lighting sources over a broad area. It determines the total installed luminous flux (Φinst) needed to provide the required received flux (Φrec), taking into account the maintenance factor and utilization factor. The utilization factor depends on luminaire properties, room reflectance, distribution of light sources, and the room index. The number of lamps required is calculated as the product of the required flux and area divided by the lamp lumen output and adjustment factors.
Illumination Lighting
The document discusses the principles of street lighting. It describes two main principles: 1) the diffusion principle and 2) the specular reflection principle. The diffusion principle uses reflectors designed to spread light uniformly downward, creating soft, diffuse light without harsh shadows. This prevents glare for drivers. The specular reflection principle uses upward-curved reflectors to throw light at a large angle, allowing the light source and road surface to be seen but creating glare. Diffuse lighting is preferred for safety.
Illumination.
This document discusses illumination and lighting design. It begins by outlining the objectives of studying illumination for architects, including providing proper ambient lighting, safety, and energy efficiency. It then defines key lighting terms like illuminance, luminous intensity, and luminance. The document covers the inverse square law and Lambert's cosine law governing light distribution. It describes the history of lighting technologies from candles to modern LEDs. It also discusses light sources like fluorescent lamps and the types of lighting schemes and lamps used in various applications.
INTERIOR LIGHTING DESIGN A STUDENT'S GUIDE
This guide on lighting design is intended for students who have no prior knowledge of lighting and also for those who are experienced but would like to bring themselves up to date with developments in lamp and luminaire design, modern design theory, European Standards and the CIBSE code for Interior Lighting 1994.
It develops the basic principles of lighting science but then goes on to provide a modern design perspective for both artificial lighting and day lighting which will be useful to experienced designers.
LIGHT AND LIGHTING FIXTURES
The presentation discusses light and lighting fixtures. It defines light and how it is produced through electrons moving between orbits in atoms. It then covers the different types of light sources including natural light and various artificial lights. The rest of the presentation focuses on methods of lighting, including types of lighting fixtures for indoor and outdoor use. It also addresses the effects of lighting in different areas and the advantages and disadvantages of natural versus artificial light.
Slit Lamp Illumination Techniques
This document describes various illumination techniques used with a slit lamp to examine different parts of the eye. It discusses diffuse, direct, tangential, and specular illumination techniques as well as indirect, retroillumination, and Van Herrick techniques. Each technique is used to illuminate a specific area of the eye in order to observe different structures like the cornea, iris, lens, anterior chamber angle, and detect any pathologies present. Proper illumination angles and magnifications are outlined for visualizing various eye tissues and evaluating properties like surface texture and integrity.
Types of Lighting and Luminaire
Sample pictures of lighting and luminaire, For architecture students having subjects such as Building Utilities; Lighting and Acoustics.
Definiciones
El documento describe los componentes clave de una reforma curricular, incluyendo la visión, ejes, fines, misión, perfiles y principios. La visión es la descripción ideal del currículo a nivel local en el futuro. Los ejes son conceptos, valores y habilidades que dan dirección a la reforma educativa. Los fines son las grandes metas hacia las cuales se orienta la transformación curricular. La misión expresa el propósito principal del currículo. Los perfiles son las capacidades que los estudiantes deben tener al ingresar a cada nivel académic
Estudo de Caso - Plugados (Adria)
Trabalho apresentado na aula de Comportamento do Consumidor, onde escolhemos o case "Biscoito Pugados" da Adria para estudar o público tween.
Apresentação realizada no 1º Encontro de Orientadores de Estudos do PNEM/UREI
Este documento resume uma formação de professores no Centro de Ensino do estado de Goiás, gerido por Maria Divina Alves França e Aldenir Ferreira Cezar. A formação contou com 23 professores, após 6 desistências e 4 ouvintes, e utilizou encontros presenciais semanais e atividades à distância para debater temas educacionais.
Entrada 2 hipotesis de pruebas
Este documento explica los conceptos de prueba de hipótesis, incluyendo la hipótesis nula y alternativa, los pasos para realizar una prueba de hipótesis, y dos ejemplos de pruebas de hipótesis. Se define la prueba de hipótesis como el procedimiento para tomar una decisión sobre una hipótesis inicial basada en datos de una muestra aleatoria. Se concluye rechazando o no rechazando la hipótesis nula dependiendo de si los datos de la muestra son congruentes o no con la hipó
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En vedette
Illumination model
An illumination model, also called a lighting model and sometimes referred to as a shading model, is used to calculate the intensity of light that we should see at a given point on the surface of an object.
Surface rendering means a procedure for applying a lighting model to obtain pixel intensities for all the projected surface positions in a scene.
A surface-rendering algorithm uses the intensity calculations from an illumination model to determine the light intensity for all projected pixel positions for the various surfaces in a scene.
Surface rendering can be performed by applying the illumination model to every visible surface point.
ILLUMINATION & LIGHTING
This document discusses illumination and lighting schemes. It begins with an introduction to artificial lighting and important terminology like luminous flux and illumination. It then describes different lighting schemes including direct, semi-direct, semi-indirect and indirect lighting. It also discusses the design of indoor lighting schemes and different types of lamps such as incandescent, halogen, discharge and fluorescent lamps. Finally, it covers topics like industrial lighting, street lighting and references used.
Laws of illuminations
This document discusses two laws of illumination: 1) The Law of Inverse Squares, which states that the intensity of illumination from a point source decreases inversely with the square of the distance from the source. 2) Lambert's Cosine Law, which states that the illumination at a point on a surface is proportional to the cosine of the angle between the normal to the surface and the direction of the light. It also provides background on units of measurement for light intensity, illuminance, and how photometric benches can be used to measure the candlepower of lamps.
Illumination basic and schemes
This document provides an overview of various types of electrical lighting sources and illumination concepts. It discusses the basic terms used in illumination like luminous flux, lumen, candle power, and inverse square and Lambert's cosine laws. It then describes different electrical light sources including incandescent, fluorescent, mercury vapor, sodium vapor, neon and halogen lamps. For each light source, it explains the working principle, construction details, advantages and applications. The document serves as a useful reference for understanding various electrical lighting techniques and concepts of illumination.
Road Lighting
Photometric
Road Class
MOT / Municipality
Recommendation
New Trends
Closing
The document discusses road lighting in Saudi Arabia and provides information on:
1) Key lighting terminology such as luminous flux, luminous intensity, illuminance, and luminance as well as the relationships between these terms. It also presents some basic lighting formulas.
2) Methods for calculating illuminance and luminance levels on roads using photometric data and factors like pole height, pole spacing, and light loss.
3) Saudi road classification systems from the Ministry of Transportation and municipalities and recommended lighting schemes from Saudi Lighting Company.
4) Trends in new road lighting technologies and references
Illumination - Method of calculation
There are three main methods for lighting calculations: 1) Watts per square meter, 2) Lumen or light flux, and 3) Point to point or inverse square law. The lumen method is used to estimate illumination patterns from diffuse lighting sources over a broad area. It determines the total installed luminous flux (Φinst) needed to provide the required received flux (Φrec), taking into account the maintenance factor and utilization factor. The utilization factor depends on luminaire properties, room reflectance, distribution of light sources, and the room index. The number of lamps required is calculated as the product of the required flux and area divided by the lamp lumen output and adjustment factors.
Illumination Lighting
The document discusses the principles of street lighting. It describes two main principles: 1) the diffusion principle and 2) the specular reflection principle. The diffusion principle uses reflectors designed to spread light uniformly downward, creating soft, diffuse light without harsh shadows. This prevents glare for drivers. The specular reflection principle uses upward-curved reflectors to throw light at a large angle, allowing the light source and road surface to be seen but creating glare. Diffuse lighting is preferred for safety.
Illumination.
This document discusses illumination and lighting design. It begins by outlining the objectives of studying illumination for architects, including providing proper ambient lighting, safety, and energy efficiency. It then defines key lighting terms like illuminance, luminous intensity, and luminance. The document covers the inverse square law and Lambert's cosine law governing light distribution. It describes the history of lighting technologies from candles to modern LEDs. It also discusses light sources like fluorescent lamps and the types of lighting schemes and lamps used in various applications.
INTERIOR LIGHTING DESIGN A STUDENT'S GUIDE
This guide on lighting design is intended for students who have no prior knowledge of lighting and also for those who are experienced but would like to bring themselves up to date with developments in lamp and luminaire design, modern design theory, European Standards and the CIBSE code for Interior Lighting 1994.
It develops the basic principles of lighting science but then goes on to provide a modern design perspective for both artificial lighting and day lighting which will be useful to experienced designers.
LIGHT AND LIGHTING FIXTURES
The presentation discusses light and lighting fixtures. It defines light and how it is produced through electrons moving between orbits in atoms. It then covers the different types of light sources including natural light and various artificial lights. The rest of the presentation focuses on methods of lighting, including types of lighting fixtures for indoor and outdoor use. It also addresses the effects of lighting in different areas and the advantages and disadvantages of natural versus artificial light.
Slit Lamp Illumination Techniques
This document describes various illumination techniques used with a slit lamp to examine different parts of the eye. It discusses diffuse, direct, tangential, and specular illumination techniques as well as indirect, retroillumination, and Van Herrick techniques. Each technique is used to illuminate a specific area of the eye in order to observe different structures like the cornea, iris, lens, anterior chamber angle, and detect any pathologies present. Proper illumination angles and magnifications are outlined for visualizing various eye tissues and evaluating properties like surface texture and integrity.
Types of Lighting and Luminaire
Sample pictures of lighting and luminaire, For architecture students having subjects such as Building Utilities; Lighting and Acoustics.
Definiciones
El documento describe los componentes clave de una reforma curricular, incluyendo la visión, ejes, fines, misión, perfiles y principios. La visión es la descripción ideal del currículo a nivel local en el futuro. Los ejes son conceptos, valores y habilidades que dan dirección a la reforma educativa. Los fines son las grandes metas hacia las cuales se orienta la transformación curricular. La misión expresa el propósito principal del currículo. Los perfiles son las capacidades que los estudiantes deben tener al ingresar a cada nivel académic
Estudo de Caso - Plugados (Adria)
Trabalho apresentado na aula de Comportamento do Consumidor, onde escolhemos o case "Biscoito Pugados" da Adria para estudar o público tween.
Apresentação realizada no 1º Encontro de Orientadores de Estudos do PNEM/UREI
Este documento resume uma formação de professores no Centro de Ensino do estado de Goiás, gerido por Maria Divina Alves França e Aldenir Ferreira Cezar. A formação contou com 23 professores, após 6 desistências e 4 ouvintes, e utilizou encontros presenciais semanais e atividades à distância para debater temas educacionais.
Entrada 2 hipotesis de pruebas
Este documento explica los conceptos de prueba de hipótesis, incluyendo la hipótesis nula y alternativa, los pasos para realizar una prueba de hipótesis, y dos ejemplos de pruebas de hipótesis. Se define la prueba de hipótesis como el procedimiento para tomar una decisión sobre una hipótesis inicial basada en datos de una muestra aleatoria. Se concluye rechazando o no rechazando la hipótesis nula dependiendo de si los datos de la muestra son congruentes o no con la hipó
En vedette (19)
Apresentação realizada no 1º Encontro de Orientadores de Estudos do PNEM/UREI
Apresentação realizada no 1º Encontro de Orientadores de Estudos do PNEM/UREI
Plus de Ayman Asfahani
Portfolio
Jumbo International is a Kuwaiti limited liability company specializing in external services like roads, sewage, and construction. It has over 325 employees including engineers, technicians, and laborers. The company works with subcontractors on infrastructure projects like roads, bridges, buildings, and water systems. It owns equipment used for tasks like asphalt production, transport, and road works. Jumbo International has completed multiple road maintenance and construction contracts for the Kuwaiti Ministry of Public Works.