Luminaire Selection Flashcards

A retail jewelry display requires luminaires with a Color Rendering Index (CRI) of at least what value to accurately show gemstone colors?

Answer: CRI 90

Jewelry and fine merchandise displays require CRI 90+ to accurately render subtle color differences in gemstones and precious metals.

Which luminaire type is most appropriate for illuminating a vertical artwork surface with minimal scalloping or hot spots?

Answer: Wall wash luminaire with asymmetric distribution

Wall wash luminaires with asymmetric optical distributions are specifically designed to provide even, uniform illumination across vertical surfaces.

A luminaire's BUG rating system measures Backlight, Uplight, and Glare. What does a U0 rating indicate?

Answer: Zero uplight emissions

U0 in the BUG rating system indicates zero uplight, meaning no light is emitted above the horizontal plane, which is important for dark sky compliance.

For a museum gallery with heat-sensitive artifacts, which luminaire technology is preferred over traditional halogen accent lighting?

Answer: LED with remote phosphor

LED with remote phosphor separates the heat-generating source from the light-emitting surface, significantly reducing IR radiation and heat at the artifact plane.

A hospitality designer specifies 2700K luminaires throughout a hotel lobby. What characteristic does this color temperature primarily convey?

Answer: Warm and intimate ambiance

2700K produces a warm white light similar to incandescent, creating an intimate and welcoming atmosphere suited for hospitality spaces.

Which photometric distribution is best suited for a high-bay industrial space with 30-foot ceiling heights requiring uniform horizontal illuminance?

Answer: Batwing distribution

Batwing distribution provides maximum candlepower at oblique angles, reducing direct downward intensity and creating more uniform horizontal illuminance from high mounting heights.

When selecting luminaires for a wet location such as a pool deck, what minimum IP rating is required for fixtures directly exposed to water jets?

Answer: IP65

IP65 provides complete dust protection and protection against water jets from any direction, making it the minimum standard for wet outdoor applications with direct water exposure.