![]() The luminous efficacy is a measure that indicates how efficient a light source is. Compact fluorescent lamp/energy-saving lamp: with 15 W electrical power: luminous flux Φ = 900 lm Incandescent lamp with 15 W electrical power: luminous flux Φ = 90 lm Two examples of typical luminous flux values: Short wavelengths are termed ultraviolet and longer waves are termed infrared. ![]() How bright and colourful the human eye can perceive a light depends on the wavelength of the radiation and the intensity with which the radiation hits the retina. When visible light is emitted, this is also called luminescence. Light is created when energy is converted. They travel in waves and transmit energy impulses. Light consists of photons, also called light particles. The total luminous flux emitted by a light source over a certain period of time. The ratio of emitted luminous flux to required electrical power. The measure for the impression of brightness of a surface, perceived by the human eye. The measure for the light that arrives at a receiver surface. Gives information about how much light is radiated in a certain direction. The measure for the total amount of light emitted by a light source. The following table provides an overview of the most important photometric quantities and units: Photometrische Größe In light measurement, a distinction is made between various photometric quantities by which the unit of light intensity can be evaluated. Hence, we see a glowing moon at night in the sky, although it is an illuminated object.Important photometric quantities and units Since light comes to our eyes, we see the moon at night.Some of the light from the moon is bouncing back to our eyes.So, what is the reason? Let us try to understand, the process, As the moon is a non-luminous object, it should not provide the light. Due to this behavior of the moon, we see it at the night, as a bright object, where from we get the light. Then it’s an obvious question how do we see the moon?Įxplanation: We all know that the earth moves around the sun and the moon moves around the earth. Hence, the moon is an illuminated object i.e. Is Moon A Luminous Object? – How Do We See the Moon?ĭescription: Moon can not produce light. ![]() Hence, light rays come to our eyes and we can see. After that, the apple bounces back the light to our eyes. Here, the sun is the source of light and the light falls on the apple. How do we see the non-luminous or illuminated object? Now, in the same philosophy, this object means, here, it produces light that comes directly to our eyes and we can see. Remember that, if the light is coming from an object to our eyes, then only we see the object. How Do We See Luminous Object?ĭescription: We know that if the light is present, we can see the object. Do you want to know about the examples of transparent objects or translucent objects, check our other article. There are thousands of examples of luminous & illuminated objects. Illuminated objects are visible only when light bounces back from themĭifference Between Luminous and Non Luminous Objects There are many differences, as follows between Luminous and Non Luminous Objects: Description Illuminated objects Difference Between Luminous and Non Luminous Objects ![]()
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