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2. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   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 ...

3. Orders of magnitude (illuminance) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude...

   Absolute darkness. 10 −4. 100 microlux. 100 microlux. Starlight overcast moonless night sky [1] 140 microlux. Venus at brightest [1] 200 microlux. Starlight clear moonless night sky excluding airglow [1]

4. Solar power in the United States - Wikipedia

   en.wikipedia.org/wiki/Solar_power_in_the_United...

   In 2023, utility-scale solar power generated 164.5 terawatt-hours (TWh), or 3.9% of electricity in the United States. Total solar generation that year, including estimated small-scale photovoltaic generation, was 238 TWh. [2] As of the end of 2023, the United States had 179 gigawatts (GW) of installed photovoltaic (utility and small scale) and ...

5. Solar luminosity - Wikipedia

   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.

6. Sunlight - Wikipedia

   en.wikipedia.org/wiki/Sunlight

   Taken on 20 October 1968 from Apollo 7. Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light. On Earth, sunlight is scattered and filtered through Earth's atmosphere as daylight when the Sun is above the horizon.

7. Solar simulator - Wikipedia

   en.wikipedia.org/wiki/Solar_simulator

   A solar simulator (also artificial sun or sunlight simulator) is a device that provides illumination approximating natural sunlight. The purpose of the solar simulator is to provide a controllable indoor test facility under laboratory conditions.