10.2 Hourly Results

The next set of results consists of a color-coded hourly results table and a pull-down menu to choose the data to be displayed as shown to the right. The hourly results table has a row for each month of the year, January through December, and a column for each hour, 1 through 24. The data displayed represents the monthly average for that particular hour. This can inform the user of which times of day are and are not performing well. Similar to the daily results, the Critical Hour is highlighted. This represents the hour with the lowest average monthly illuminance in a typical year. If minimum or maximum illuminance is selected in the pull-down menu, the Critical Hour highlighted is either the lowest minimum illuminance or higher maximum illuminance.

The options to display on the table are selected in the pull-down menu and include:

Average Light Output [%] – This option displays the monthly average light output for all luminaire zones for each hour of the day, weighted according to the overall lighting power.
Average Illuminance [fc or lux] – This option displays the monthly average workplane illuminance under both electric light and daylight.
Maximum Illuminance [fc or lux] – This option displays the monthly maximum workplane illuminance under both electric light and daylight.
Day of Maximum Illuminance [day] – This option displays the day of the month when the maximum illuminance occurred.
Minimum Illuminance [fc or lux] – This option displays the monthly minimum workplane illuminance under electric light and daylight.
Day of Minimum Illuminance [day] – This option displays the day of the month when the minimum illuminance occurred.
Electric Savings [kWh/month] – This option displays the electric savings achieved for the given hour over the entire month. This represents the electric savings due only to the electric lighting system and not other indirect electric savings due to reduced fan power and cooling electricity requirements.
Additional Heating Load [kBtu/month or kWh/month] – This option displays the additional heating load imposed on the space due to the lack of heat gain from turned off electric lighting.
Cooling Load Savings [kBtu/month or kWh/month] – This option displays the reduced cooling load provided to the space due to the lack of heat gain from turned off electric lighting.