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

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.