Tips and Tricks for Using EnergyPlus — EnergyPlus 8.8

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Daylight Modeling[LINK]

Why isn’t my lighting energy being reduced with a daylighting system?

In order to see changes in the lighting electric power consumption due to daylighting, the Fraction Replaceable in the Lights input object must be set to 1.0. This is documented in the I/O reference, and also a warning is generated in the ERR file.