LED stands for ‘Light Emitting Diode’, which converts electric signal to infrared or visible light. It is comprised of an alloy crystal or semiconductor placed in a reflective cup and chemically bonded to tiny wires that are encapsulated. Electricity is applied across one direction of the semiconductor causing the LED to emit light.
A pixel is the smallest component of the display that can be individually controlled. The word pixel is a short name for picture element.
A module is the minimal until that can display data or a combination of a fixed number of pixels.
Resolution is the overall number of pixels in a display. The higher resolution produces better picture quality.
Brightness of LEDs is measured using millicandela, which is 1/1000 of a candela. The brightness of a candela is about the brightness of one candlelight
The viewing angle is the total range that the message is legible. Typical viewing angles range from 90 degrees to 150 degrees.
There are quite a few advantages to using LEDs. Generally LEDs are heatless, use 90% less energy, and last ten plus years. They are also smaller and do not contain any dangerous chemicals like mercury. They can readily be put in places that have always been too small or out-of-the-way for many incandescent lights, as well as in places that were always very dangerous or difficult to get at. Also, the more sophisticated LED apparatuses like wall washers and spotlights are DMX-controllable, which means they can be used in some really impressive ways.
The bottom line is that LED's are easier and safer to use than all previous lighting technologies. Plus, LEDs will save you money by consuming less power, lasting much longer, and generating much less heat, which in turn combine to result in lower climate control costs.
Efficacy is a term normally used in cases where the input and output units differ. In lighting, we are concerned with the amount of light (in lumens) produced by a certain amount of electricity (in watts).
On the other hand, efficiency is a term that is typically dimensionless. For example, lighting fixture efficiency is the ratio of the total lumens exiting the fixture to the total lumens initially produced by the light source.
An LED does not burn out like a standard lamp, so individual diodes do not need to be replaced. Instead, the diodes gradually produce lower output levels over a very long period of time. If one LED fails, it does not produce a complete fixture outage.
Based on how long a fixture is illuminated per day, here's what 50,000 works out to:
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