Which of the following choices is not an effective solution to the energy waste related to inefficient lighting? a. using low-pressure sodium lighting sources b. pointing lights on billboards and street

Which of the following choices is not an

effective solution to the energy waste related
to inefficient lighting?
a. using low-pressure sodium lighting sources
b. pointing lights on billboards and street
signs upward
C. placing light sources on time controls
d. shielding light to direct it downward

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