I want to know the (1) overall market size, in term of number of lamp,
of street lamp (street lighting) in France; (2) breakdown of market
size of street lamp in the highway, expressway, town center and other
road types in France; (3) power consumption (in Watt or currency) of
street lamp in France

If direct national statistics is not available and figures are
inferred (eg from a few cities to project the whole country, or from
road length and number of street lamp in different types of roads
etc), then the supporting figures should be sufficient so that a
reasonable estimates can be produced.  Supporting is required in any
case.