The angular dimension of the cone of light from reflectorized lamps encompassing the central part of the beam out to the angle where intensity is 50% of maximum. Categories from narrow angle to wider angle are Spot, Narrow Flood, Flood, Wide Flood.
A multi-arm, decorative, often ornate ceiling light fixture that holds a number of bulbs.
Color Rendering Index (CRI)
A measure of the correspondence between the color of an object and its appearance under a light source. CRI>60 or >70 is considered to be not good and CRI >80 is considered to be very good. CRI =100 is equivalent to natural sunlight!
A specification of the color appearance of a lamp, measured in degrees Kelvin (K). For example: 2200K = “warm white”, 2700 = “soft white”, 3000K = “bright white,” 3500K = “neutral white”, 4000K = “cool white”, >5000K = “natural light”, and >6000K = “daylight”.
The lamp’s ability to convert electrical power to light output. Simply put, lumens/watts.
Recognized as an NRTL in the United States and, in a similar capacity, as a Testing Organization and Certifying Body in Canada by the Standards Council of Canada. A product bearing the ETL Listed Mark is determined to have met the minimum requirements of prescribed product safety standards.
A light fixture that is attached directly to the ceiling with no gap between the light and ceiling.