P out

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Sir,

In DER -278, Page 16, Efficiency vs. Line and Output (LED String) Voltage

P CAL (W) = V OUT x I OUT

How P OUT (W) is calculated?

Thanks

Ravik 

Pout(W) under load measurement is measured output power using power meter Yokogawa WT210. This is the accurate way of measuring output power for LED with significant amount of output ripple current.