Which lighting is known to be a very bright white?

• A. LED Lamps
• B. Sodium Vapor Lamps
• C. Quartz Lamps
• D. Mercury Vapor Lamps

Answer: (C)

This question is testing how different lamp technologies produce different light colors and brightness. Very bright white light comes from sources that can run at high filament temperatures and use a heat-resistant envelope, which lets them emit a crisp, broad white spectrum. Quartz lamps do this well: the quartz glass allows the filament to reach higher temperatures and stay bright, giving a strong, white, high-output light.

Sodium vapor lamps emit a yellow-orange glow, not white, so they don’t fit the description. Mercury vapor lamps produce a bluish-white light but aren’t as bright or color-rendering friendly as quartz halogen in typical security lighting. LEDs can also be very bright white, but in this context quartz-based lamps are the classic option associated with a very bright white appearance.