Streetlights and traffic lights

Do we need to include public lighting too, to get an accurate estimate, or do home and work dominate the lighting budget? Street-lights in fact use about 0.1 kWh per day per person, and traffic lights only 0.005 kWh/d per person - both negligible, compared with our home and workplace lighting. What about other forms of public lighting - illuminated signs and bollards, for example? There are fewer of them than street-lights; and street-lights already came in well under our radar, so we don't need to modify our overall estimate of 4 kWh/d per person.

Light: 4 kWh/d

Light: 4 kWh/d

Biomass: food, biofuel, wood, waste incin'n, landfill gas: 24 kWh/d

Solar heating: 13 kWh/d

Solar heating: 13 kWh/d

Figure 9.1. Lighting - 4kWh per day per person.

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