Compare designs with one number.
Learning Track · Module 4: Energy and carbon · Step 27 of 101
- PDI (power density indicator): watts for each lux on each square metre, W/(lx·m²). Lower is better.
- AECI (annual energy consumption indicator): kWh per square metre per year, including dimming.
Both come from EN 13201-5. They are useful in any region: two designs that meet the same level can have very different PDI. Ask for both in tenders.
Sources
- EN 13201-5 Energy performance indicators
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