Led Lighting For Energy Efficiency Ppt Download

Current led lamps have an efficiency of about 30 to 40.

Led lighting for energy efficiency ppt download.

However it also means that sophisticated engineering is needed to produce an led light bulb that shines light in every direction. 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. It is also defined as the. It is defined as the light output divided by the electrical input power.

When designed well led lighting is more efficient versatile and lasts longer. 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. 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.

Led light bulbs are 10 60 times more energy efficient than incandescent light bulbs. 7 most modern led operate in a range of 2 to 4 volts and consume anywhere between 350ma and 1500ma. Residential leds especially energy star rated products use at least 75 less energy and last 25 times longer than incandescent lighting. Led is a highly energy efficient lighting technology and has the potential to fundamentally change the future of lighting in the united states.

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. 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. These also have an efficiency so that the overall efficiency is lower again.

Size typical package is only 5 mm in diameter. Robustness no moving parts no glass no filaments. But this is only the efficiency of the light emitting diode. Changing light bulbs in a large building create considerable maintenance cost.

Power consumption of led light bulb is only 10 of the standard light bulb. Benchmarks for the efficacy of led packages and complete luminaires as well as providing comparisons to conventional technologies. Led light bulbs typically need to be changed only every 10 12 years. 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. Energy efficiency 50 90 less energy used translates into smaller power supply. The remaining energy used is radiated as heat.