That's because the energy band structure of semiconductors differs between materials, so photons are emitted with differing frequencies. The wavelengths that we - humans - can see, ranges from approximately 390 nanometer to 700 nanometer (nm). LED lights will remain cool to the touch because the tiny amount of heat that is emitted during the production of light is so miniscule that it cannot affect the temperature of the casing. 3. Back light, as its name implies, refers to light emitted behind the luminaire. LEDs have fast become the go-to lighting for both businesses and homes. In contrast, LED lighting is directional, meaning that all of the light energy is emitted in the direction the light is pointed (in whatever beam pattern it is designed to produce). The wavelength of light, and therefore the color, depends on the type of semiconductor material used to make the diode. Because LED lights are resistant to shock, vibrations and external impacts, they make great outdoor lighting systems for rough conditions and exposure to weather, wind, rain or even external vandalism, traffic related public exposure and construction or manufacturing sites. The back light region is further divided into four subzones corresponding to increasing angles of emittance from 0 degrees (i.e., light is directed downward toward the ground), to 90 degrees (i.e., light is mostly directed outward parallel to the ground). Fluorescent bulbs and light-emitting diodes (LEDs) have taken over lighting because they are more energy efficient and can provide better lighting than incandescent bulbs. In warmer environments and at higher currents, the temperature of the semiconducting element increases. In this article, we discuss the health impacts of the light emitted from LED lights - in particular, "blue light" as it relates to the LED spectrum, as well as the effect of flicker that is prevalent in LED lights. It’s raining LED lights LEDs, or light-emitting diodes, are like Amazon: They’re everywhere. Because the flickering happens at … Higher temperatures generally reduce light output. Like incandescent bulbs, fluorescent bulbs can be inefficient because the plasma needs to be sustained and it emits radiation in the nonvisible range. Different LEDs emit different colors of light - different wavelengths that is. For example, most Leading Edge Design lights are designed to emit a 120º beam pattern, so all light is directed within that 120º pattern. The light output of an LED for a constant current varies as a function of its junction temperature. Incidentally, Monsanto Company is the first company to produce LED lights on a large scale and for mass consumption. Here's a table of common LED … The LED is a special type of diode and they have similar electrical characteristics to a PN junction diode. Zero UV Emissions – LED Lighting Features Close to No UV Emissions The emission spectrum of a typical fluorescent bulb. In 1962, Nick Holonyak has come up with the idea of a light-emitting diode, and he was working for the general electric company. During the mid-1970s, scientists started using only Gallium Phosphide to make LEDs that emitted a pale green light. The quantization is either due to direct emission from the plasma or by the phosphors, but to a human eye, the light emitted still seems white. Craford also invented an LED that emitted about ten times brighter light than Holonyak’s version. The Light-emitting diode is a two-lead semiconductor light source. LED lights are preferable to compact fluorescent lights for two very good reasons. Many LED bulbs produce flicker - a rapid switching between on and off states. Figure 9 shows the light output of several LEDs as a function of junction temperature. Dec. 15, 2016 — Although residential and commercial industries are widely adopting energy-efficient light emitting diodes (LEDs), the drop in LED prices is driving away manufacturers because …