| 1. | It is obtained by dividing the luminous flux by the radiant flux.
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| 2. | Watts are units of radiant flux while lumens are units of luminous flux.
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| 3. | Chemical actinometry involves measuring radiant flux via the yield from a chemical reaction.
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| 4. | Let us show the relation between them using the radiant flux as an example:
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| 5. | Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux.
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| 6. | Thus, a 60 watt light bulb emits a total radiant flux of about 45 watts.
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| 7. | The radiant flux ( i . e . solar power ) absorbed by the Earth is thus given by:
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| 8. | The radiance of an optical system is equal to the derivative of the radiant flux with respect to the etendue.
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| 9. | Where is the radiant flux measured at distance ( in parsecs ), the radiant flux measured at distance 10 pc } }.
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| 10. | Where is the radiant flux measured at distance ( in parsecs ), the radiant flux measured at distance 10 pc } }.
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