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Ballast
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Magnetic Ballast
Also called core and coil ballasts, magnetic ballasts are the less expensive option but are considerably heavier than electronic ballasts. They also require a few seconds to light and sometimes produce a low hum.
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Electronic Ballast
Electronic ballasts allow the lamp to start instantly.
They are light in weight and consume less energy than magnetic ballasts.
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Color Rendition Index (CRI)
Color rendition is a measure of how the lamp influences the color appearance of the objects being illuminated. It represents the ability of a lamp to render colors accurately and to show color variations more clearly. High color rendition allows us to see objects as we would expect them to appear under natural sunlight. Color rendition is measured via a complex process on the Color Rendering Index scale (CRI), which ranges in value from 0 to 100.
Color Temperature
Color temperature is the color appearance of the light produced by a lamp and the color appearance of the lamp itself. It is measured with the Kelvin scale (K).
A lamp with a low color temperature will have a warm appearance (red, orange or yellow), while a lamp with a high color temperature will have a cool appearance
(blue or bluish-white).
Efficacy vs. Efficiency
Efficacy is the lamp output per unit of energy input to the lamp. Therefore, it is the ratio of lamp output to wattage consumption, expressed in lumens-per-watt (LPW). Efficiency is the absolute percentage of light produced within a fixture that is not absorbed within the fixture, but that actually leaves the fixture.
Footcandles vs. Candlepower
A footcandle is a measure of the quantity of light (illuminance) which falls on a surface. Candlepower describes the light intensity of a lamp in a certain direction. It is a measure of the light source itself, measured in candelas.
Harmonic Distortion (THD)
Total harmonic distortion is a measure of the degree by which a sinusoidal wave shape is distorted by harmonics. Harmonics are the higher multiples of the fundamental frequency. If distorted, they can potentially interfere with the operation of electrical devices, such as radios, televisions and sensitive electronic equipmentin hospitals.
Lamp
A lamp is the actual light-producing component inside a light bulb.
Lamp Life
Lamp life is the lamp's average life span measured in hours-per-start. Hours-per-start is the amount of time the lamp is on before it is turned off and then on again. (Panasonic measures 2.5 hours on and 30 minutes off.) The more frequently a lamp is turned on or off, the lower the lamp's rated life. The lamp loses some material needed for startup and operation every time it is turned on. Fluorescent lamps, on average, last ten times longer than incandescent lamps.
Lumen
A lumen is the measure of the amount of light produced by a lamp.
Lumen Maintenance
A measure of how light output reduces during the lifetime of a lamp.
Watt
A lumen is the measure of the amount of electrical power required by a product to operate at any given instant.
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