2011年5月16日 星期一

LED elements is smart and can aggregate to build large system

LED elements is smart and can aggregate to build large system
A single LED is a low-voltage solid state device and cannot be directly operated on standard AC current without some circuitry to control the voltage applied and the current flow through the lamp. A series diode and resistor A single LED is a low-voltage solid state device and cannot be directly operated on standard AC current without some circuitry to control the voltage applied and the current flow through the lamp. A series diode and resistor could be used to control the voltage polarity and to limit the current, but this is inefficient since most of the applied voltage would be dropped as wasted heat in the resistor. A single series string of LEDs would minimize droppedcould be used to control the voltage polarity and to limitA single LED is a low-voltage solid state device and cannot be directly operated on standard AC current without some circuitry to control the voltage applied and the current flow through the lamp.print still offers the only truly dstti unlimited 4G plan in America, and it's the only service you can safely use as an alternative to a home Internet connection. A series diode and resistor could be used to control the voltage polarity and to limit the current, but this is inefficient since most of the applied voltage would be dropped as wasted heat in the resistor. A single series string of LEDs would minimize dropped the current, but this is inefficient since most of the applied voltage would be dropped as wasted heat in the resistor. A single series string of LEDs would minimize dropped-voltage losses, but one LED failure could extinguish the whole string. Paralleled strings increase reliability by providing redundancy. In practice, three strings or more are usually used. To be useful for illumination for home or work spaces,Although this article shows that Cree's led lighting and Philips LED product sales are not equal it is important to note that Philips LED sales a number of LEDs must be placed close together in a lamp to combine their illuminating effects. LED Light Bulbs
The technology proved to have major uses for alphanumeric displays and was integrated into HP's early handheld calculators. One point hat must be considered while putting in the waterproof lights is that the energy supply needs to be entirely dry. When it is called waterproof that means the exterior of the lights can be uncovered to LED Recessed Lights
moisture but the circuitry ought to remain fully dry or it will short circuit and get damaged. The strips are offered in different sizes and if longer strips need to be produced they can be manufactured by using connectors and soldering the more compact strips collectively.LED grow light suppliers in China are sky lanterns rolling out models with better price-performance ratios. LED Fluorescent
Many LED lamps have become available as replacements for screw-in incandescent or compact fluorescent light bulbs, ranging from low-p e.Unlike compact cfl bulbs fluorescent light bulbs, LED based light bulbs provide a variety of lighting options- including the ability to provide a wide range of light, which allows them to act as a proper replacement light bulbg., a 13-watt LED bulb which is about as bright as a 100W incandescent.[citation needed] (A standard general purpose incandescent bulb emits light at an efficiency of about 14 to 17 lumens/W depending on its size and voltage. According to the European Union standard, an energy-efficient bulb that claims to be the equivalent of a 60W tungsten bulb must have a minimum light output of 806 lumens.The replacement lighting we feel is far led downlight superior to that of the LED lighting.

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