Measurements and estimations of indicator values may require measuring data for a set of parameters. For example, the
information needed for greenhouse gas emissions reduction impact requires measuring data for parameters, such as the
number of lamps replaced by efficient lamps, or operating hours of lamps. The data could be collected and processed through
either a top-down or bottom-up approach. These two approaches combined can increase the reliability of measurements and
estimates. The measurement approach depends on the type of information being collected.
The top-down approach focuses on collecting data from the supply side, that is, from those implementing the activity, such as
the providers of lighting products and services.
The bottom-up approach consists of collecting data from users of lighting products. Information should be collected from a
large sample, so surveys or field audits should be used. The types of data regarding lighting products that could be collected
through surveys are, for example Percent of population using efficient products Average daily operating hours, by type of building, by room, or by type of lighting system Factors that influence purchases Other information about the national or local market.Surveys can document indirect impacts of NAMA implementation. For example, a sample survey carried out on carefully defined
control groups could be used to measure the impact of efficient lamp distribution on the population outside the coverage area,
or, to measure the influence of awareness campaigns.
The Clean Development Mechanism methodology, “AM46 Distribution of efficient light bulbs to households, version 2”57 is an
example of using sample control groups to collect data. Similarly, Clean Development Mechanism small-scale methodology,
“AMS-II.L. Demand-side activities for efficient outdoor and street lighting technologies, version 1.0” recommends sample surveys
to collect data for estimating the emissions reductions58. Other Clean Development Mechanism small scale methodologies
include: “AMS-II.J. Demand-side activities for efficient lighting technologies, version 5.0,” “AMS-II.N. Demand-side energy
efficiency activities for installation of energy efficient lighting and/or controls in in buildings, version 1.0,” and “AMS-III.AR.
Substituting fossil fuel based lighting with LED/CFL lighting systems, version 4.0.”
