Luminous Arc 3 English 82 [NEW]
The lux (symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI). 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 wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception. In English, "lux" is used as both the singular and plural form.
Luminous Arc 3 English 82
Illuminance is a measure of how much luminous flux is spread over a given area. One can think of luminous flux (with the unit lumen) 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 is inversely proportional to area when the luminous flux is held constant.
Achieving an illuminance of 500 lx might be possible in a home kitchen with a single fluorescent light fixture with an output of 12000 lumens. To light a factory floor with dozens of times the area of the kitchen would require dozens of such fixtures. Thus, lighting a larger area to the same illuminance (lux) requires a greater luminous flux (lumen).
This means that white (or whitish) light sources produce far fewer lumens per watt than the theoretical maximum of 683.002 lm/W. The ratio between the actual number of lumens per watt and the theoretical maximum is expressed as a percentage known as the luminous efficiency. For example, a typical incandescent light bulb has a luminous efficiency of only about 2%.
Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI). Depending on context, the power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy, or others) consumed by the source.Which sense of the term is intended must usually be inferred from the context, and is sometimes unclear. The former sense is sometimes called luminous efficacy of radiation, and the latter luminous efficacy of a light source or overall luminous efficacy.
Not all wavelengths of light are equally visible, or equally effective at stimulating human vision, due to the spectral sensitivity of the human eye; radiation in the infrared and ultraviolet parts of the spectrum is useless for illumination. The luminous efficacy of a source is the product of how well it converts energy to electromagnetic radiation, and how well the emitted radiation is detected by the human eye.
Luminous efficacy can be normalized by the maximum possible luminous efficacy to a dimensionless quantity called luminous efficiency. The distinction between efficacy and efficiency is not always carefully maintained in published sources, so it is not uncommon to see "efficiencies" expressed in lumens per watt, or "efficacies" expressed as a percentage.
Luminous efficacy of radiation measures the fraction of electromagnetic power which is useful for lighting. It is obtained by dividing the luminous flux by the radiant flux. Light with wavelengths outside the visible spectrum reduces luminous efficacy, because it contributes to the radiant flux while the luminous flux of such light is zero. Wavelengths near the peak of the eye's response contribute more strongly than those near the edges.
Photopic luminous efficacy of radiation has a maximum possible value of 683.002 lm/W, for the case of monochromatic light at a wavelength of 555 nm (green). Scotopic luminous efficacy of radiation reaches a maximum of 1700 lm/W for monochromatic light at a wavelength of 507 nm.
Artificial light sources are usually evaluated in terms of luminous efficacy of the source, also sometimes called wall-plug efficacy. This is the ratio between the total luminous flux emitted by a device and the total amount of input power (electrical, etc.) it consumes. The luminous efficacy of the source is a measure of the efficiency of the device with the output adjusted to account for the spectral response curve (the luminosity function). When expressed in dimensionless form (for example, as a fraction of the maximum possible luminous efficacy), this value may be called luminous efficiency of a source, overall luminous efficiency or lighting efficiency.
The main difference between the luminous efficacy of radiation and the luminous efficacy of a source is that the latter accounts for input energy that is lost as heat or otherwise exits the source as something other than electromagnetic radiation. Luminous efficacy of radiation is a property of the radiation emitted by a source. Luminous efficacy of a source is a property of the source as a whole.
The following table lists luminous efficacy of a source and efficiency for various light sources. Note that all lamps requiring electrical/electronic ballast are unless noted (see also voltage) listed without losses for that, reducing total efficiency.
Sources that depend on thermal emission from a solid filament, such as incandescent light bulbs, tend to have low overall efficacy because, as explained by Donald L. Klipstein, "An ideal thermal radiator produces visible light most efficiently at temperatures around 6300 C (6600 K or 11,500 F). Even at this high temperature, a lot of the radiation is either infrared or ultraviolet, and the theoretical luminous [efficacy] is 95 lumens per watt. No substance is solid and usable as a light bulb filament at temperatures anywhere close to this. The surface of the sun is not quite that hot." At temperatures where the tungsten filament of an ordinary light bulb remains solid (below 3683 kelvin), most of its emission is in the infrared.
The Church not only embraces in herself all the vocations which God gives her along the path to salvation, but she herself appears as a mystery of vocation, a luminous and living reflection of the mystery of the Blessed Trinity. In truth, the Church, a "people made one by the unity of the Father, the Son and the Holy Spirit,"(98) carries within her the mystery of the Father, who, being neither called nor sent by anyone (cf. Rom. 11:33-35), calls all to hallow his name and do his will; she guards within herself the mystery of the Son, who is called by the Father and sent to proclaim the kingdom of God to all and who calls all to follow him; and she is the trustee of the mystery of the Holy Spirit, who consecrates for mission those whom the Father calls through his Son Jesus Christ.
Alkaid is notable for being one of the hottest stars that can be seen without binoculars. It has a surface temperature of 20,000 kelvins. The star has six solar masses and is about 700 times more luminous than the Sun. Like Dubhe, Alkaid does not belong to the Ursa Major Moving Group.
Megrez, Delta Ursae Majoris, is the faintest of the seven bright stars that form the Big Dipper asterism. It is a main sequence star of the spectral type A3 V. It has a visual magnitude of 3.312 and is approximately 58.4 light years distant from the solar system. It is 14 times more luminous than the Sun and has 63% more mass. The star emits an excess of infrared radiation, which indicates a debris disk in its orbit.
A day after setting sail for Skellig aboard Roderick's warship, the Seahorse, Farnese is trained by Schierke in manifesting her luminous body, and while doing so overhears Guts explaining his relationship with Casca to Roderick. She suddenly finds herself returned to her physical body to her astonishment, and later tends to Casca when she is in need of a hot bath after she falls into the sea. When Casca pours a bucket of water on Farnese after accidentally getting soap in Farnese's eye, Farnese snaps at her for being ungrateful to the man who has constantly risked his life to save hers so many times. Farnese breaks down in tears before Casca cheers her up by dumping another pail of water on herself. Sometime after Roderick and his men drive off Bonebeard and his crew, Farnese is given some peace of mind when told that she has a vital role in her group despite her believing otherwise.
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