Led Lighting For Energy Efficiency Ppt Download

7 most modern led operate in a range of 2 to 4 volts and consume anywhere between 350ma and 1500ma.

Led lighting for energy efficiency ppt download.

It is also defined as the. Benchmarks for the efficacy of led packages and complete luminaires as well as providing comparisons to conventional technologies. This expression simply says that the voltage is proportional to the electric energy and is a general statement which applies to any circuit as well as to led s. Current led lamps have an efficiency of about 30 to 40.

Robustness no moving parts no glass no filaments. Led light bulbs withstand great amount of vibration shock and temperature variations. Size typical package is only 5 mm in diameter. But this is only the efficiency of the light emitting diode.

A very important metric of an led is the external quantum efficiency ηext. More light from less power led 20 it is essentially a semi conductor diode it consists of a chip of semiconducting material treated to create a structure called a p n positive negative junction when an electron meets a hole it falls into a lower energy level and releases energy in the form of a photon light. Advantages energy savings typically a led based light bulb uses 10 of traditional and only 50 of energy saving lighting technologies. The remaining energy used is radiated as heat.

Led is a highly energy efficient lighting technology and has the potential to fundamentally change the future of lighting in the united states. Power consumption of led light bulb is only 10 of the standard light bulb. It is defined as the light output divided by the electrical input power. These also have an efficiency so that the overall efficiency is lower again.

It quantifies the efficeincy of the conversion of electrical energy into emitted optical energy. When designed well led lighting is more efficient versatile and lasts longer. However it also means that sophisticated engineering is needed to produce an led light bulb that shines light in every direction. Led light bulbs are 10 60 times more energy efficient than incandescent light bulbs.

That means leds are able to use light and energy more efficiently in a multitude of applications. Introduction the energy efficiency of led products is typically characterized using efficacy which in basic terms is the ratio of power input to light output or more technically emitted flux lumens divided. The energy e of the light emitted by an led is related to the electric charge q of an electron and the voltage v required to light the led by the expression. Led light bulbs typically need to be changed only every 10 12 years.

Changing light bulbs in a large building create considerable maintenance cost. An led lamp also contains an led driver and optical components. The advantage of led lighting long life lifetimes can exceed 100 000 hours as compared to 1 000 hrs for tungsten bulbs.