Question 131Electricity & Electronics - 1st Asst/Chief

The correct answer is A) Low pressure mercury fluorescent. The diagram shown in figure "A" of the illustration EL-0081 represents a low pressure mercury fluorescent lighting fixture. This type of lighting fixture is commonly used in indoor and outdoor applications due to its energy efficiency and long lifespan. The low pressure mercury vapor within the fluorescent tube generates ultraviolet radiation, which in turn excites a phosphor coating on the inside of the tube, producing visible light. The other answer choices are incorrect because high pressure mercury fluorescent fixtures, low voltage quartz lamps, and high pressure sodium lamps have different operating principles and physical characteristics that do not match the diagram shown in the illustration.