What is an LED?
Think light emitting diodes (LEDs) are just for flashlights and cell phone displays? Think again. Once relegated to humble indicator lights in electronic devices, LED lights have advanced at remarkable rates to enable an entirely new category of lighting that’s projected to reach $30 billion by 2025.
These very same sources will one day light our homes and everyday spaces. Why? Because they’re highly efficient, long lasting, environmentally friendly and inherently controllable – enabling both new and traditional applications of light. Promising future aside, LED lighting systems already illuminate famous buildings, bridges, retail shops, television studios, theatre stages, hotels, casinos, hospitals, restaurants and celebrity-filled nightclubs around the world.
What is so different about LED Lights?
First let’s take a look at the traditional light bulb or “lamp” as it’s called by the industry.
The light in most homes is produced by incandescent sources. The bulb structure is produced when hot glass is blown into molds and then cooled and coated with diffusing material. Placed inside the bulb is a very thin and fragile, coiled tungsten filament (.0017 inches thick). For the bulb to produce light and electric current is passed through a conductor and the tungsten is heated to the point at which it gives off light. Unfortunately, these bulbs, like many of their relatives, are not very energy efficient; roughly 10% of the energy is used to make visible light.
How to LED Lights Work?
The structure of the LED light is completely different than that of the light bulb. Amazingly, the LED has a simple and strong structure. The beauty of the structure is that it is designed to be versatile, allowing for assembly into many different shapes. The light-emitting semiconductor material is what determines the LED’s colour.
As indicated by its name, the LED is a diode that emits light. A diode is a device that allows current to flow in only one direction. Almost any two conductive materials will form a diode when placed in contact with each other. When electricity is passed through the diode the atoms in one material (within the semiconductor chip) are excited to a higher energy level. The atoms in that first material have too much energy and need to release that energy. The energy is then released as the atoms shed electrons to the other material within the chip. During this energy release light is created. The colour of the light from the LED is a function of the ingredients (materials) and recipes (processes) that make up the chip.
What are the advantages of LED Lights?
LED Lights have a variety of advantages over other light sources:
- High-levels of brightness and intensity
- Low-voltage and current requirements
- Low radiated heat
- High reliability (resistant to shock and vibration)
- No UV Rays
- Long source life
- Can be easily controlled and programmed
Today is an exciting time for those working closely with LED lighting systems. The versatility and durability of LED lighting systems allow those in the industry to harness new and innovative uses of lighting applications in dynamic, practical and dramatic settings to create a stunning visual kaleidoscope of colour and light.
Far surpassing the simple enclosure of LEDs on a circuit board, today’s LED’s offer thermal management, binning and optics to high-efficiency LED drivers and advanced power components. The continuous development and technological advancements in LED’s have ultimately resulted in reducing the cost and complexity of LED lighting control, operation and installation which in turn has accelerated market adoption of this exciting medium.
Though it’s been shown to affect the way people live, work, and feel, light has long been considered an afterthought. Light and lighting applications play an integral role,often, unnoticed in a society where technology continues to advance daily. LED Lighting’s contribution to the colourful world we live in continues to evolve aesthetically, environmentally and visually.