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Sources & References
International System of Units (SI): power and radiant flux
Power and radiant flux is measured in the watt (W); 1 hp = 745.6999 W. Conversions between SI and other units use exact, internationally agreed factors maintained by NIST.
International System of Units (SI)
Authoritative definitions for power and radiant flux, from the BIPM SI Brochure (9th edition), the defining reference for the SI.