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en.wikipedia.org/wiki/Solar_luminosity

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. This does not include the solar neutrino luminosity ...

planetfacts.org/what-is-solar-luminosity

To measure the brightness or luminosity (also called as radiant power) of a star, astronomers use the Sun’s own level of luminosity as their point of comparison. One solar luminosity unit, therefore, is equal to about 3.839×1026 W, or 3.839×1033 erg/s, or the Sun’s commonly accepted luminosity.

www.revolvy.com/topic/Solar luminosity&item_type=topic

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. It is defined in terms of the Sun's output. One solar luminosity is 3.828×1026 W.[2] This does not include the solar neutrino luminosity, which would add 0.023 L.[3] The Sun is a weakly variable star, and its luminosity therefore ...

www.cfa.harvard.edu/~dfabricant/huchra/ay145/units.html

Unit Conversion. A common problem in astronomy is the conversion of a quantity measured in some units into a quantity based on other units. There are also several `systems of measurement' in use in physics and astronomy. ... 1 Solar Luminosity = 3.826x10 33 ergs/s = 3.826x 26 Joules/s = 3.826x 26 Watts

csep10.phys.utk.edu/OJTA2dev/ojta/c2c/sun/properties/luminosity_tl...

The relationship between the solar constant and the solar luminosity is determined by simple geometry. Imagine a sphere the size of the Earth's orbit surrounding the Sun. The amount of solar energy passing through each square meter of the surface of this sphere is the solar constant, 1400 Watts per square meter.

en.wikipedia.org/wiki/Lumunosity

Measuring luminosity. In astronomy, luminosity is the amount of electromagnetic energy a body radiates per unit of time. When not qualified, the term "luminosity" means bolometric luminosity, which is measured either in the SI units, watts, or in terms of solar luminosities (L ☉).A bolometer is the instrument used to measure radiant energy over a wide band by absorption and measurement o...

www.fxsolver.com/browse/formulas/Solar+luminosity

One solar luminosity is 3.828×1026 W. This does not include the solar neutrino luminosity, which would add 0.023 L☉. The Sun is a weakly variable star, and its luminosity therefore fluctuates. The major fluctuation is the eleven-year solar cycle (sunspot cycle) that causes a periodic variation of about ±0.1%.