RESOURCES/CHOOSING A LIGHT SOURCE


The right combination of source, fixture, and effects devices can be used to create stunning lighting designs that are also energy-efficient. Technological advancements make it easier than ever to support environmental concerns with lamps that conserve energy and provide quality illumination.

 

lm

LUMENS

A lumen is the SI derived unit of luminous flux, a measure of the total “amount” of visible light emitted by a source.




 

K

COLOR TEMPERATURE

Degrees Kelvin refers to the color of transmitted light; lower Kelvin values denote a warmer perceived light, and higher values a cooler, more bluish light. For typical environments, the range of color temperatures employed would be 2700K for a warmer glow to 4000K for a crisp, brighter illumination.

CRI

COLOR RENDITION

CRI stands for "Color Rendering Index" and represents an average scoring of 8 test colors as rendered by light. Mutually exclusive from color temperature, CRI is scored from 1 being the lowest and 100 being the most optimal color rendering.



LED

EFFICIENCY

(LUMENS/WATT)

40-89

COLOR TEMP

(DEGREES/KELVIN)

2,700-4,000

COLOR RENDITION

(CRI)

80+/95+

AVG. RATED LIFE

(HOURS)

50,000

Light emitting diodes are highly efficient, solid state sources that can offer point source lighting. Available in a wide range of whites and discrete colors with a range of color rendering options, LEDs do not emit harmful IR (infrared) or UV (ultra-violet) radiation, do not contain mercury, and emit minimal heat. Recent advancements in LED technology make them an excellent alternative to halogen and metal halide sources. Their small size brings them close to the optimal point source and creates a range of opportunities for energy efficient lighting design.

HID

EFFICIENCY

(LUMENS/WATT)

50-57

COLOR TEMP

(DEGREES/KELVIN)

3,000-4,000

COLOR RENDITION

(CRI)

81/92+

AVG. RATED LIFE

(HOURS)

10,000-12,000

High intensity discharge lamps are an arc source, often referred to as metal halide. Usually thought of as very high wattage, large area light sources, low wattage, ceramic metal halide HID lamps offer an energy-efficient alternative to standard incandescent light sources, with similar color temperature and rendition. They are effective in applications where instant-on, instant re-strike, or dimming are not required, such as high-ceiling interiors, retail stores, public spaces, or residential exteriors where the fixtures are operating on controls.

MR/LINE VOLTAGE HALOGEN

EFFICIENCY

(LUMENS/WATT)

10-17

COLOR TEMP

(DEGREES/KELVIN)

2,000-3,050

COLOR RENDITION

(CRI)

95+

AVG. RATED LIFE

(HOURS)

3000-6000

Halogen lamps are incandescent lights that use filaments originally developed for the automotive industry. Those in the MR (multifaceted reflector) configuration are known for their precision and variably focused beam that uses IR (infrared) technology to more efficiently pack light, offering higher wattage performance at lower wattage consumption. Because their color temperature renders environments as if under sunlight, color, texture, skin tones, fabrics and food all look natural under halogen lights. Special halogen IR lamps contain no mercury, are energy-efficient, offer instant-on, and are easily dimmable, making them a versatile choice.