How are lighting schedules applied in EnergyPlus?

energyplus
lighting
schedule
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Hello, what does the following E+ snippet of code mean? "Schedule:Compact, LIGHT-SCHED, Fraction, Through: 12/31, For: Weekdays, Until: 05:00, 0.05, Until: 07:00, 0.1, Until: 08:00, 0.3, Until: 17:00, 0.9, Until: 18:00, 0.7, Until: 20:00, 0.5, Until: 22:00, 0.3, Until: 23:00, 0.1, Until: 24:00, 0.05,"

For example: "Until: 17:00, 0.9" does it mean that from 8:00 to 17:00 the lights are on for 90% of the time OR that the office uses 90% of the maximum wattage of lights during the whole time?

Thank you.

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Alex Vlachokostas

asked 2015-03-31 10:46:15 -0500

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__AmirRoth__

updated 2015-07-10 09:07:06 -0500

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If the Lights object uses this schedule, then the load (W, W/ft2, W/person) will be multiplied by these values. From the I/O document:

Field: Schedule Name

The name of the schedule that modifies the lighting power design level (see Design Level Calculation Method field and related subsequent fields). The schedule values can be any positive number. The electrical input for lighting in a particular timestep is the product of the design level and the value of this schedule in that timestep. If the design level is the maximum lighting power input the schedule should contain values between 0.0 and 1.0.