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of 5,780 K (5,510 °C, 9,940 °F), is composed of near-thermal-spectrum radiation that is slightly more than half infrared. At zenith, sunlight provides an irradiance of just over 1 kW per square meter at sea level. Of this energy, 527W is infrared radiation, 445W is visible light, and 32W is ultraviolet radiation. Nearly all the infrared radiation in sunlight

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