Illuminance In photometry, illuminance is the total luminous flux incident on a surface, per unit area.It is a measure of how much the incident light illuminates the surface, wavelength weighted by the luminosity function to correlate with human brightness perception Similarly, luminous emittance is the luminous flux per unit area emitted from a surface Luminous emittance is also known as luminous exitance. Lux The lux symbol lx is the SI derived unit of illuminance and luminous emittance, measuring luminous flux per unit area It is equal to one lumen per square metre In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface It is analogous to the radiometric unit watt per square metre, but with the power at each Illuminance Definition of Illuminance by Merriam Webster Test Your Knowledge and learn some interesting things along the way. TAKE THE QUIZ Illuminance Explained Lumenistics Mar , Illuminance exploring incident light Illuminance is the amount of light striking a surface also known as incident light, where the incident is the beam of light actually landing on the surface. Daylight calculations and measurements Daylight, Energy Illuminance is the measure of the amount of light received on the surface It is typically expressed in lux lm m .Illuminance levels can be measured with a luxmeter, shown in Figure , or predicted through the use of computer simulations with recognised Illuminance Recommended Light Level Light Level or Illuminance is the total luminous flux incident on a surface per unit area The area the work plane is where the most important tasks in the room or space are performed. Lux Dies ist eine Begriffsklrungsseite zur Unterscheidung mehrerer mit demselben Wort bezeichneter Begriffe. Solar Resource Glossary Grid Modernization NREL Aerosol Optical Depth Technically known as the relative aerosol optical depth is the extinction per unit path length due to aerosols alone The typical means of computing this is to account for the extinction of as many of the other constituents as possible water vapor, ozone, mixed gases, and equivalent extinction represented by Rayliegh scattering of atmospheric molecules and Home fitzlight WELCOME TO A WORLD OF LIGHT Fitzgerald Lighting are one of the UK s leading manufacturers of Energy Efficient Lighting for Commercial Lighting, Industrial lighting, Education and Healthcare applications.Call us now to book your FREE lighting design, or for energy payback advice. clairement lumineux Wikipdia Dfinition En photomtrie, l clairement lumineux correspond un flux lumineux reu par unit de surface.Si un lment de surface dS reoit un flux lmentaire d a , Pour tenir compte de la sensibilit visuelle humaine, le rayonnement lectromagntique qui constitue la lumire est pondr selon la fonction d efficacit lumineuse spectrale.