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I had an experiment for a cubic room in Auckland (New Zealand) each of room walls directed to the north, east, south, and west directions. The length and width of the room are both 5 meters. The north wall is totally covered by a window. I examined different heights of the room from 2.4 meters to 5.1 meters. The luminaires in the room can be dimmed for daylight harvesting and room is office only is used for business hours ( say 7 AM to 6 PM). The annual energy usage for lighting calculated by EN 15193 method and based on DIALux software outputs, show twice energy usage when height is 5.1 meters in comparison with 2.7 meters. But in E+ there is not substantial change even consumed energy decreases when height changes from 2.7 m to 5.1 m. It is a big question for me what is the source of this difference.

I had an experiment for a cubic room in Auckland (New Zealand) each of room walls directed to the north, east, south, and west directions. The length and width of the room are both 5 meters. The north wall is totally covered by a window. I examined different heights of the room from 2.4 meters to 5.1 meters. The luminaires in the room can be dimmed for daylight harvesting and room is office only is used for business hours ( say 7 AM to 6 PM). The annual energy usage for lighting calculated by EN 15193 method and based on DIALux software outputs, show twice energy usage when height is 5.1 meters in comparison with 2.7 meters. But in E+ there is not substantial change even consumed energy decreases when height changes from 2.7 m to 5.1 m. It is a big question for me what is the source of this difference.