Professional-use disclosure

Screening outputs, not approvals

Calculator results, reference values, guides, and Workspace reports are provided for informational screening. They are not engineering advice, not a code compliance determination, not a photometric study, not a contractor quote, and not a promise of savings or performance.

Codes, standards, and the authority having jurisdiction come first

Where this site discusses illuminance, power density, layout, or installation practice, the adopted energy code and illumination standard, the authority having jurisdiction, and the equipment manufacturer data always govern. If a calculator result and a code rule disagree, the code rule wins. Electrical installation and service work should be performed or supervised by qualified, licensed persons in accordance with local law.

Illuminance, codes, and tariffs must be verified

• Confirm the governing documents: the adopted code edition, the illumination standard for the project, and any client standard that overrides both.
• Confirm the product data: delivered lumens, distribution, driver ratings, and derating from the manufacturer photometric file and datasheets.
• Confirm the operating basis: measured or scheduled hours, and the all-in energy price including demand and fixed charges for commercial accounts.

No conflicts, no paid placement

Calculator defaults and guide examples are editorial choices, not endorsements. The site does not accept payment to favor equipment, installers, lenders, or rate plans in its tools or content. If that ever changes for a specific page, the relationship will be stated on that page.

Corrections

If a page contains an unclear definition, a broken result, a stale rate, or missing source context, send the URL and the specific issue through Contact. Verified corrections are applied and noted. Contact the site.