Answer:
For this system to be efficient, the surfaces above the luminous ceiling must be white, so that all the light been transmitted is reflected.
Step-by-step explanation:
White surfaces reflect light at almost 100% efficiency, this ensures that non of the light been transmitted is absorbed.
Thus, if one type of illumination system consists of rows of strip fluorescents and a ceiling that will transmit light. For this system to be efficient, the surfaces above the luminous ceiling must be white so that all the light been transmitted is reflected.