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Read MoreLED lamps use what to make light?
Early LEDs (Light Emitting Diodes) were used mainly for small indicator lights for applications like display panels, they have been used in this way since the 1960s and they looked like the bulbs at the top of this page.
During the early 2000s, we began to see LED technology used for environment lighting as well (e.g. homes, offices, factories, schools) and LED bulbs began to look much like our traditional light bulbs. They even produced LED strips to look like Fluorescent Tubes.
LEDs use semiconductors. Yes, it's similar to the material used on processors for circuit boards. However, the materials used in LEDs are for the purpose of producing light. In addition to being cooler and more energy efficient (like Fluorescent Lighting), LEDs have an added value of lasting a VERY long time, in addition to being shatter/shock proof.
As you can see from the early LED lights, the semiconductor is a very small component. The semiconductor itself produces a bluish-white light and the lens/case changes the color to fit the application. More recent LEDs might appear as below, but the same semiconductor principles.
LED lights work when electricity is run through the semiconductor die, which makes it produce a bluish light. Notice the yellow layer on top of the semiconductor. It changes the semiconductor's bluish light to become more of a comfortable white light, sometimes this yellow layer is referred to as the Fluorescent layer or Phosphor layer. The LED may have a lens on top to redirect the light to obtain uniform overall intensity.
Phosphorescence vs. Fluorescence
Both use "light to make light". However, phosphorescent material does not immediately re-emit the radiation it absorbs.
Die or Diode - these words may sometimes be used in place of LED chip or semiconductor chip.
LED Package - this is the entire housing (i.e. package) for the LED.
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- Let's have an over view of the 3 common types of artificial light. The traditional Incandescent bulbs were first on the scene. Next, came the Fluorescent Lights and then LED Lights, both bringing advantages in bulb lifespan and energy savings. However, they are all three, still in use with their own distinct advantages and disadvantages. Read MoreIncandescent lighting uses heat (thermal radiation) to produce light. Sunlight and Candle light are generated in this way. Incandescent Light Bulbs also generate heat (thermal radiation) through a "filament". The filament heats up to produce light like a candle. Read More
Fluorescent Lights have been commercially available since the 1930s as long Fluorescent Tubes. A smaller bulb like CFL (Compact Fluorescent Light) only became widely available in the 2000s. These lights use a mercury vapor (steam) inside the tube; electricity is applied within the tube, which causes the mercury vapor to emit UV light, or more accurately UV radiation. The UV radiation hits the inside surface of the tube which is coated with a phosphor material. The UV radiation causes the phosphor to glow.
Read MoreArtificial Lighting Advantages & Disadvantages
Practically and economically speaking, LEDs seem to have a huge advantage and this is why most newly built facilities in developing countries are choosing LEDs for most of their environment lighting (e.g. factories, offices, libraries, museums).
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