luminous flux वाक्य
उदाहरण वाक्य
मोबाइल
- On September 1, 2010, European Union legislation came into force mandating that lighting equipment must be labelled " primarily " in terms of luminous flux ( lm ), instead of electric power ( W ).
- Like the photometric definition, it is related to the luminous flux density in a particular direction, which is radiant flux density weighted by the luminosity function ( " ? " ) of the CIE Standard Observer.
- One can think of luminous flux ( measured in lumens ) as a measure of the total " amount " of visible light present, and the illuminance as a measure of the intensity of illumination on a surface.
- A given amount of light will illuminate a surface more dimly if it is spread over a larger area, so illuminance ( lux ) is inversely proportional to area when the luminous flux ( lumens ) is held constant.
- A source radiating a power of one watt of light in the color for which the eye is most efficient ( a wavelength of 555 nm, in the green region of the optical spectrum ) has luminous flux of 683 lumens.
- It differs from radiant flux, the measure of the total power of electromagnetic radiation ( including infrared, ultraviolet, and visible light ), in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light.
- The manufacturer of each selected luminaire will be required to commission third-party testing, each being tested for : total luminous flux, luminaire efficacy, correlated color temperature, color rendering index, steady state package / module / array temperature, and maximum power supply case.
- In LED lighting, "'lumen maintenance "'is the luminous flux remaining ( expressed as a percentage of the initial output ) at any selected elapsed operating time . "'Lumen depreciation "'is the luminous flux lost over time, and thus the complement of lumen maintenance.
- In LED lighting, "'lumen maintenance "'is the luminous flux remaining ( expressed as a percentage of the initial output ) at any selected elapsed operating time . "'Lumen depreciation "'is the luminous flux lost over time, and thus the complement of lumen maintenance.
- These are used in several applications, including new generation tanning lamp systems, whereby a 100 watt lamp ( e . g ., F71T12BP ) can be lit using 90 watts of actual power while obtaining the same luminous flux ( measured in lumens ) as magnetic ballasts.
- Apart from the quantum efficiency it depends on the incident photon flux and the exposure time, which is equivalent to the exposure and the sensor area; since the exposure is the integration time multiplied with the image plane illuminance, and illuminance is the luminous flux per unit area.
- Similarly, the adjective " bright " can refer to a light source which delivers a high luminous flux ( measured in lumens ), or to a light source which concentrates the luminous flux it has into a very narrow beam ( candelas ), or to a light source that is seen against a dark background.
- Similarly, the adjective " bright " can refer to a light source which delivers a high luminous flux ( measured in lumens ), or to a light source which concentrates the luminous flux it has into a very narrow beam ( candelas ), or to a light source that is seen against a dark background.
- Daylight factor is the ratio of the illuminance at a point on a plane, generally the horizontal work plane, produced by the luminous flux received directly or indirectly at that point from a sky whose luminance distribution is known, to the illuminance on a horizontal plane produced by an unobstructed hemisphere of this same sky ."
- But the basic results of recent research are unambiguous : assuming equal luminous flux ( that is, equal amounts of visible light ), and matched optical characteristics of the fixtures ( particularly the amount of light allowed to radiate directly upward ), white sources rich in shorter ( blue and green ) wavelengths produce dramatically greater sky glow than sources with little blue and green.
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