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An LED is a solid-state device and does not require the heating of a filament to create light. Rather, electricity is passed through a chemical compound that is excited and thus generates light. LEDs are not bulbs or lamps. LEDs require precise manufacturing operation to make them ready to be used. They need to be placed on a circuit board or other material that will allow electricity to pass through it at a specific voltage and current, and with components required to operate them at specific voltages such as 12 V DC, 24 V DC, or 120 V AC. They are not readily available to be plugged into a 12-volt or 120-volt power source.
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An LED bar is a solid strip of material to which LEDs have been soldered, along with resistors and other components that a specific product requires to make them operate at the stated operating voltage. The bars are usually an enclosed strip of LEDs. Enclosures are plastics, or aluminum, or metal composites with various types of lens/cover plates.
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A group of LEDs set in a square, rectangular, or linear pattern, and formatted to be operated at a specific voltage. They will always include two wires called leads. One is positive, the other negative.
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LED drivers are current control devices that replace the need for resistors. LED drivers respond to the changing input voltage while maintaining a constant amount of current (output power) to the LED as its electrical properties change with temperature.
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LED lighting is a general term used by those who do not know the specific type or category of LED lighting they are after. LED lighting includes LED bulbs and fixtures, flashlights, strips, clusters, and other LED light sources.
LED Strips
LED strips are usually printed circuit boards with LEDs soldered to the board. The strip can be rigid, or flexible and without any enclosure to protect the LED and circuit.
Low Voltage
LEDs require 12 V DC, 24 V DC, or 48 V DC to be powered, as opposed to 110/120 V AC, which is high voltage. Usually, LEDs utilize a low voltage of 12 V DC; however, sometimes 24 V DC is used. To run these low voltage lights, power must be sent to the light through a power supply, transformer, or adapter that is connected to 110/120/240 V AC power lines. The actual voltage reaching the light will be at 12 V DC.
Lumen Maintenance
Lumen maintenance is defined as how well an LED light bulb is able to retain its intensity when compared to a new one. Typically, a highpower SMD LED bulb will retain 70 percent of its intensity for 40,000 50,000 hours. This means a good-quality LED bulb will run eight hours a day for 13 years at 70 percent of its new condition. It is interesting to state that no other light source can achieve such results.
Lumens
The lumens is the unit of luminous flux use by the International System and is equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions. It is used to measure light bulbs as stand-alone light sources. Lighting fixtures are measured by lux output, which is lumens per square meter.
The lux is typically used to measure the light intensity produced by a lighting fixture. The higher the lux reading, the more light the lighting fixture is producing for a given area, known as lumens per square meter.
LED mA
All LEDs run on current, and current is measured in milliamps (mA). All LED products have a mA rating at which they are powered.
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Max Rated Temperature
Max rated temperature is often called the operating temperature. It is the ambient temperature at which the LED light source is installed and at which it should be maintained. In most cases, this is around 40 50 C, which is comparable to 104 to 122 F. Operating an LED light source beyond the operating temperature will lower the LED s life span, leading to its destruction.
mcd stands for millicandela. It is used to rank the brightness of an LED. 1000 mcd is equal to one candela. The higher the mcd number, the brighter the light the LED emits. The human eye may sense visible light, as described in Fig. 1.9. The visible light spectra varies between ultraviolet 350 to red 700 nm (Fig. 1.10). Light between 315 and 380 nm is often called long wave or black-light.
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