The LED consists

There are several creative people out there who have conjured up a way to use the LED Light bulb and I’m not talking just LED flashlights or random LED home lighting. I’m talking some really ingenious ways to make the most of this state of the art technology. For mobile purposes people have started manufacturing LED lights for trucks, Auto LED lights and various forums of custom mounted automotive LED Lighting. People have the misconception that every LED light bulb on the market is very expensive and they feel the need to search for LED clearance lights, when that is not the case. If anything the LED light bulb has almost caught up to the tradition bulb in terms of price; and over time far surpasses it. LED house lights, small LED lights or just your normal run of the mill white LED lights are all very affordable.

In 2009, a process for growing gallium nitride (GaN) LEDs on silicon has been reported. Epitaxy costs could be reduced by up to 90% using six-inch silicon wafers instead of two-inch sapphire wafers.

Studies indicate more than 70 percent of legal-drinking-age men have put their beer in the freezer to achieve the desired level of cold. The trick is to know when to take the beer out. Now on Coors Light bottles and cans, the iconic mountains still turn blue when the beer is cold, and in addition, a new Cold Indicator bar will turn blue at the same time. Then, when the Coors Light temperature is at the peak of refreshment, a second Super Cold Indicator bar turns blue.

Another company is Pixi Lighting, which introduced an A19 LED tube light earlier this month. It has a color rendering index (CRI) of 90, a measure of light quality, and a color temperature of 3,000 Kelvin, or white light. The 40-watt equivalent, which uses 6.5 watts, has been in an overhead fixture in my house for a few weeks and I find the light quality is good.

Physics

The LED consists of a chip of semiconducting material doped with impurities to create a p-n junction. As in other diodes, current flows easily from the p-side, or anode, to the n-side, or cathode, but not in the reverse direction. Charge-carriers—electrons and holes—flow into the junction from electrodes with different voltages. When an electron meets a hole, it falls into a lower energy level, and releases energy in the form of a photon.

The wavelength of the light emitted, and thus its color depends on the band gap energy of the materials forming the p-n junction. In silicon or germanium diodes, the electrons and holes recombine by a non-radiative transition which produces no optical emission, because these are indirect band gap materials. The materials used for the LED have a direct band gap with energies corresponding to near-infrared, visible or near-ultraviolet light.