Ads
related to: brightest lumens for solar lightsproducts.bestreviews.com has been visited by 1M+ users in the past month
Search results
Results from the WOW.Com Content Network
The solar luminosity (L ☉) is a unit of radiant flux (power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun. One nominal solar luminosity is defined by the International Astronomical Union to be 3.828 × 10 26 W. [2]
Factor ()Multiple Value Item 0 0 lux 0 lux Absolute darkness 10 −4: 100 microlux 100 microlux: Starlight overcast moonless night sky [1]: 140 microlux: Venus at brightest [1]: 200 microlux
Multiplying the figure of 1,050 watts per square meter by 93 lumens per watt indicates that bright sunlight provides an illuminance of approximately 98,000 lux (lumens per square meter) on a perpendicular surface at sea level. The illumination of a horizontal surface will be considerably less than this if the Sun is not very high in the sky.
Brightest sunlight: 111,000 lux: Bright sunlight 109,880 lux: AM 1.5 global solar spectrum sunlight (= 1,000.4 W/m 2) [3] [circular reference] 20,000 lux: Shade illuminated by entire clear blue sky, midday 1,000–2,000 lux: Typical overcast day, midday 400 lux: Sunrise or sunset on a clear day (ambient illumination) <200 lux: Extreme of ...
A more complex definition of absolute magnitude is used for planets and small Solar System bodies, based on its brightness at one astronomical unit from the observer and the Sun. The Sun has an apparent magnitude of −27 and Sirius, the brightest visible star in the night sky, −1.46. Venus at its brightest is -5.
In astronomy, this amount is equal to one solar luminosity, represented by the symbol L ⊙. A star with four times the radiative power of the Sun has a luminosity of 4 L ⊙. Luminosity is an absolute measure of radiated electromagnetic energy per unit time, and is synonymous with the radiant power emitted by a light-emitting object.
Ads
related to: brightest lumens for solar lightsproducts.bestreviews.com has been visited by 1M+ users in the past month