Plan lighting control zones and check compliance with ASHRAE 90.1-2019 automatic control requirements. Calculates zones, sensors, dimmers, and daylight controls needed.
Please enter space dimensions and number of fixtures.
Affiliate link – we may earn a small commission at no cost to you
Energy codes such as ASHRAE 90.1 require automatic controls on lighting in most buildings. Typical requirements include automatic shutoff by schedule or occupancy sensor, separate control of different spaces so that lights can be dimmed or turned off by the people using them, daylight responsive control in spaces near windows and skylights, and exterior lighting controls.
The calculator helps count the zones, sensors, and dimmers that a floor plan needs. Rooms generally need their own control, large open areas are divided into zones, and spaces with enough daylight need photosensors that dim the electric light. The number of controls can grow quickly in a building with many small rooms, so planning early helps with cost and layout.
Codes change and each region adopts its own edition, with its own amendments and exceptions, so check which one applies to your project. Treat the calculator as a planning tool and confirm the requirements with the authority having jurisdiction. Commissioning is just as important as installation, since poorly adjusted controls can annoy users and may be switched off.