Question 14

Metal halide, mercury vapor, and high-pressure sodium are from the high intensity discharge (HID) family.

These lighting devices are all types of high intensity discharge lamps, which are known for their efficiency and high light output.

A) Fluorescent, mercury vapor, and halogen

This option includes fluorescent lighting, which is not classified as an HID lamp. While mercury vapor is indeed an HID type, halogen lamps fall under the category of incandescent lighting, making this option incorrect.

B) Metal halide, low-pressure sodium, and fluorescent

Although metal halide is an HID type, low-pressure sodium is a distinct category, and fluorescent lighting is not an HID type. Therefore, this combination fails to represent the HID family accurately.

C) Mercury vapor, halogen, and low-pressure sodium

While mercury vapor is part of the HID family, both halogen and low-pressure sodium are not classified as HIDs. Halogen is an incandescent type, and low-pressure sodium is a separate category, making this option incorrect.

D) Metal halide, mercury vapor, and high-pressure sodium

This option accurately lists three types of HID lamps. Metal halide, mercury vapor, and high-pressure sodium are all recognized as high intensity discharge lighting devices, thus confirming this option as correct.

Conclusion

The correct answer, D, includes only devices that are part of the high intensity discharge family, reflecting their shared characteristics of high efficiency and substantial light output. All other options contain at least one incorrect type of lighting, disqualifying them from being considered part of the HID family.