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How to read the Country Lighting Assessments?

The first page of the Country Lighting Assessment presents a summary of the current electricity consumption and CO2 emissions from electricity and fuel consumption in 100 countries, along with the benefits that they would realize by switching to efficient lighting. More precisely, the benefits include information about yearly reductions for:

  • electricity consumption, compared to equivalent small or medium sized coal-fired plants avoided, when possible
  • CO2 emissions, compared to mid-sized cars avoided, when possible
  • financial cost savings for the country

The rest of the document presents the detailed data used for calculating the benefits from switching to efficient lighting for a given country and other relevant information. It is divided into five main sections, namely:

  • Country data: including information about the size, population, population density and Gross Domestic Product.
  • Greenhouse gas emissions data:  illustrating the GHG factor, CO2 emissions for electricity and fuel combustion, and the percentage of global CO2 emissions this represents.
  • Lighting data: including information about quantity of efficient products in the market (green products), number of incandescent bulbs sold, and the average price of an IL (also known as General Lighting Service lamp, GLS) and CFLs with integrated ballast (CFLi), in a country.
  • Electricity data: providing information about average electricity cost per unit, electrification ratio, installed generating capacity, electricity consumption, electricity mix, kerosene consumption and related CO2 emissions.
  • Calculation base: featuring assumptions such as average wattage of ILs and their operation time, in order to calculate the installed wattage for ILs; annual energy consumption of ILs and related electricity costs.

Each of the five sections includes: name, value, unit of measurement, source and/or assumptions used for a given data. The fields with no source contain the calculations made from the data and/or assumptions presented earlier in the Country Lighting Assessment.


The last section details the core of the Country Lighting Assessment, providing information about the transition to efficient lighting where there is a total replacement of ILs with CFLs. In order to obtain the results of a 80% replacement rate, a simple rule of thumb should be made. It also provides calculations about annual energy, cost and CO2 savings, as well as the transition expense to energy efficient lighting and the amortization time. The reduction and savings in terms of cost, electricity consumption and CO2 emissions reflected in the summary page are highlighted. In order to make the magnitude of savings more tangible, several comparisons have been used such as; the CO2 emissions of mid-size cars, electricity generation of power plants and investment saving.


Lastly, the Country Lighting Assessment includes graphs illustrating the difference in terms of electricity consumption and the related cost of using an IL compared to a CFL.

1. What are the Country Lighting Assessments?
2. How to read the Country Lighting Assessments?
3. Methodology
4. Energy savings
5. Climate change mitigation benefits 
6. Financial benefits 
7. Country Lighting Assessments


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