Led Lighting For Energy Efficiency Ppt Download

Residential leds especially energy star rated products use at least 75 less energy and last 25 times longer than incandescent lighting.

Led lighting for energy efficiency ppt download. Size typical package is only 5 mm in diameter. These also have an efficiency so that the overall efficiency is lower again. An led lamp also contains an led driver and optical components. It is defined as the light output divided by the electrical input power.

That means leds are able to use light and energy more efficiently in a multitude of applications. 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. Power consumption of led light bulb is only 10 of the standard light bulb. 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.

The remaining energy used is radiated as heat. 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. The advantage of led lighting long life lifetimes can exceed 100 000 hours as compared to 1 000 hrs for tungsten bulbs. Led is a highly energy efficient lighting technology and has the potential to fundamentally change the future of lighting in the united states.

Led light bulbs withstand great amount of vibration shock and temperature variations. A very important metric of an led is the external quantum efficiency ηext. Led light bulbs are 10 60 times more energy efficient than incandescent light bulbs. 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.

However it also means that sophisticated engineering is needed to produce an led light bulb that shines light in every direction. It is also defined as the. Robustness no moving parts no glass no filaments. Current led lamps have an efficiency of about 30 to 40.

Energy efficiency 50 90 less energy used translates into smaller power supply. Advantages energy savings typically a led based light bulb uses 10 of traditional and only 50 of energy saving lighting technologies. It quantifies the efficeincy of the conversion of electrical energy into emitted optical energy. Changing light bulbs in a large building create considerable maintenance cost.

But this is only the efficiency of the light emitting diode. E qv joules. When designed well led lighting is more efficient versatile and lasts longer.