Which of the following is a correct pairing of lighting type and hue?

• A. Quartz lamps – very bright white
• B. Sodium vapor lamps – blue hue
• C. Mercury vapor lamps – yellow hue
• D. LED lamps – blue hue

Answer: (A)

Hue is about the color produced by the lamp’s spectrum. Quartz lamps, especially quartz tungsten halogen types, burn at a high temperature and emit a broad spectrum of light that blends into a very bright white. This is why they’re described as very bright white. Sodium vapor lamps, by contrast, emit almost a single yellow-orange line, giving a yellow hue. Mercury vapor lamps tend to appear blue-green rather than yellow, and LEDs can produce a range of colors, not inherently blue by default. So the pairing quartz lamps with very bright white best matches the typical color output of that lamp type.