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Lighting Terms

Watts: A unit for measuring electrical power

Lifetime Hours: The average amount of time that a bulb can stay lit before the end of its life. ENERGY STAR^®‘s lifetime hour ratings are based on an average of 3 hours of use per day.

Lumens: A unit of measurement for the brightness of the light. If a light bulb is blindingly bright, it produces a lot of lumens.

Dimmer:  A control that regulates light levels.

Color Temperature: The appearance of light in terms of warmth or coolness. Color Temperatures of 2700K temperatures generate a warmer color tone; color temperatures of 5000K temperatures generate a cooler color tone.

Color Rendering Index (CRI): A measure of how light sources render colors. The higher (to 100) the CRI, the better the color rendering.

ENERGY STAR:^® A U.S. Environmental Protection Agency voluntary program that helps businesses and individuals save money and protect our climate through superior energy efficiency. Products can earn the ENERGY STAR label by meeting the energy efficiency requirements set forth in ENERGY STAR product specifications. EPA establishes these specifications based on a set of key guiding principles.