What is LED?

Light-Emitting Diode

In the simplest terms, a light-emitting diode (LED) is a semiconductor device that emits light when an electric current is passed it.  Light is produced when the particles that carry the current (known as electrons and holes) combine together within the semiconductor material.


source: www.ledsmagazine.com

What is Voltage?

Is the electrical force that cause free electrons to move from one atom to another.  Just as water needs some pressure to force it through a pipe, electrical current needs some force to make it flow.  "Volts" is the measurement of "electrical pressure".


source: c03.apogee.net

What is Lumens?

Lumens measure how much light you are getting from a bulb.  More lumens means it's brighter light; fewer lumens means it's a dimmer light.  Lumens let you buy the amount of light you want. so when buying your new bulbs, think lumens, not watts.


source: energy.gov

What is Watts?

Watts are a measurement of power, describing the rate at which electricity is being used at a specific moment.  For example, a 9-watts LED light bulb draws 9 watts of electricity at any moment when turned on.  Is not a measurement of brightness.


source: www.ucusa.org

What is CFL?

Compact Fluorescent Light

In a Compact Fluorescent Light, an electric current is driven through a tube containing argon and a small amount of mercury vapor. This generates invisible ultraviolet light that excites a fluorescent coating (called phosphor) on the inside of the tube, which then emits visible light.


source: www.energystar.gov

What is Amps?

Amperage is a term often used by electricians, and means electrical current, measured in amperes, or amps. The ampere is the SI unit for electrical current, or the amount of electrical charge that flows through a conductor in a given time.


source: www.wisegeek.com

What is an Incandescent Bulb?

Incandescent bulbs are the least efficient light source commonly found in homes. These lamps produce visible light by heating a tiny coil or filament of tungsten wire that glows when it is heated by an electrical current.


source: www.energystar.gov




In general terms, "Color Rendering Index (CRI)" is a measure of light source's ability to show object colors "realistically" and "naturally" compared to a familiar reference source, either incandescent light or daylight.


source: www.irc.rpi.edu

What is CRI?


What is Kelvin ?

Light bulb colour temperature is represented in the unit of absolute temperature, Kelvin, noted by the symbol of K. Household fixtures are commonly found in colour temperature of 2700k (warm incandescent,) 3000k (warm white halogen) and 3500k (household fluorescent.) Color temperature higher than 3500k are typically used for commercial and hospital applications, as the light is bright with a bluish daylight cast that can be harsh for home interiors; but task lighting may be useful at 4000k and above.

Less than 2000k, best for low light areas where ambient illumination is welcomed

2000k-3000k best for living rooms, dinning rooms, bedrooms and outdoor spaces.

3100k-4500k gives off a bright amount of white light, best for kitchens, offices, work space and vanities where task lighting is needed.

4600k-6500k gives off a bright amount of blue-white similar to that of daylight, best for display areas and work environments where very bright illumination is needed

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