Before comparing fixtures, establish which energy-code edition and amendments apply to the project. A new standard publication does not automatically change the rules in every jurisdiction.
Confirm the adopted edition
Record the code edition, local amendments, permit date, building type, and scope of work. Ask the project designer which lighting provisions apply to new construction, additions, or alterations.
Choose the lighting-power calculation method
Use the method permitted for the project, with the correct building or space classifications. Keep floor areas, connected watts, allowances, and exceptions traceable. Do not apply a single percentage reduction to every space.
Define automatic-control behavior
For each zone, record the required shutoff or reduction, detection coverage, manual control, and timing. Verify the applicable clauses before specifying a sensor timeout.
Draw the daylight-control zones
Identify windows, skylights, controlled areas, and the fixtures in each zone. Coordinate sensor position, dimming behavior, and commissioning access with the layout.
Specify evidence with the equipment
Request fixture input power, photometry, driver-control compatibility, and the sensor coverage data used in the design. Keep approved models and settings in the schedule.
Compare the actual operating schedule
Calculate energy from the installed load and expected operation of each zone. Avoid treating a code-compliant design as a guaranteed saving percentage.
Close the loop at handover
Keep calculations, drawings, control narratives, functional tests, and final settings together. Confirm any inspection or acceptance requirements with the responsible designer and authority.
Frequently Asked Questions
Does the latest edition apply automatically?
No. Check the edition adopted by the jurisdiction and the project’s applicable permit rules.
Is fixture efficacy enough to check compliance?
No. Installed lighting power, controls, exceptions, documentation, and other applicable provisions also need review.
Official reference: ASHRAE Standard 90.1. Check the applicable product, edition, and project requirements when using this guidance.
