A high lm/W number is useful only when you know what was measured. Compare complete luminaires at the CCT, CRI, power setting, and ambient conditions you intend to order.
There is no single worldwide threshold
Efficiency requirements depend on product category, destination market, and the applicable rule or program. Identify those first. A threshold for one lamp type or incentive program cannot be applied to every fixture.
Check the applicable EU product category
For products within scope, review the relevant ecodesign and energy-labelling rules and the product data used for the assessment. Do not substitute a blanket lumens-per-watt number for the calculation and conditions in the regulation.
Check standards by product and edition
For a market-specific efficiency claim, request the standard number, edition, product category, test method, and report. Confirm that the supplied model matches the tested configuration.
Efficacy and lighting power density differ
Efficacy is lumens per watt. Lighting power density is installed watts per unit floor area. A highly efficient fixture can still produce a layout that exceeds a power allowance or delivers too little light where it is needed.
Compare the complete luminaire
Divide measured luminaire lumens by measured input watts. Keep CCT, color rendering, optic, and power settings comparable. LED-package figures exclude losses in the driver and optics.
Use watts from an equivalent lighting design
For a fair energy comparison, first check task illuminance, distribution, glare, and maintenance. Then compare installed watts and operating hours. The higher-efficacy product is not automatically the better layout.
What to retain in the order file
Keep the exact model, test report, lumen output, input power, CCT, Ra/R9, optic, and driver setting. Ask the supplier to document any component substitution before production.
Frequently Asked Questions
Are chip lumens and fixture lumens interchangeable?
No. Optics, thermal conditions, and electrical losses affect the output and efficacy of the finished fixture.
Is the highest lm/W fixture always best?
Compare useful light at the task, glare, color quality, controls, maintenance, and cost as well.
