Final answer:
The statement is false as emergency lighting systems are designed to work independently of the utility power supply, often using batteries or generators. The efficiency of fluorescent and LED lights is also a key factor in reducing energy usage.
Step-by-step explanation:
The statement that emergency lighting depends upon the power supply of the utility company is false. Emergency lighting systems are designed to operate independently of the utility company's power supply, specifically to ensure light is available during a power outage. They typically utilize batteries or backup generators to provide power. When considering energy usage and efficiency,
it is important to recognize that fluorescent lights and LED lights are more efficient than incandescent lights. It is not only the efficiency of light bulbs that matters when comparing them; other factors include the quality of light produced and their environmental impact. Furthermore, while wood is indeed an insulator, it can conduct electricity when it is wet, which allows lightning to travel through a tree to reach the earth.