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What is LED Lighting

LED is the abbreviation of “light emitting diode”, which is a semiconductor device that converts electricity to light by using the movement of electrons. It will light up when electricity passes through it. Early LEDs were often used as indicator lamps for electronic devices. However, they are now widely used in lighting.

LED lights can be divided into different categories according to shape and application, such as LED light bulbs (spotlight, down light, candle light), LED strip lights (chasing-effect strip light, RGB lights kit, meteor shower lights), LED automotive lights (G4 bulb, car logo lamp), LED work & off-road lights (flood light, flashlight), and so on.

In all these categories, there are some ubiquitous metrics used in the design to indicate their features.

General Parameters

  • Watt. Watt is a measurement of electrical power. 1 Watt is equal to the amount of energy in 1 ampere of current flowing at 1 volt. 
  • Lumen. Lumen measures how much light you are getting from a bulb. A higher lumen means a brighter light; a lower lumen means a dimmer light.
  • CRI. Color rendering index (CRI) is a metric to judge the accuracy of perceived color under artificial light. It is measured on a scale of 1-100, where the higher the number, the closer to standard colors objects will appear. A light with an 80 or above is suitable for residential use.
  • Beam angle. Beam angle is the degree of width that light emits from a light source. Based on beam angle, lights can be tagged as narrow flood, flood and wide flood, and they each present a different lighting effect.
  • Color temperature. Color temperature indicates the color of the light source itself, or how “warm” or “cool” it seems. By convention, yellow-red colors (like the flames of a fire) are considered warm, and blue-green colors (like light from an overcast sky) are considered cool. Color temperature is measured in Kelvin (K) temperature. The lower the color temperature value is, the warmer the light is.

Advantages of LED lighting

  • Efficient and energy-saving: they are 300% more efficient than compact fluorescent lights (CFLs) and 1,000% more efficient than an incandescent.
  • Long lifespan: The life of LED lights can be up to 100,000 hours, while the general lifespan of a traditional light bulb is about 1000 hours.
  • Eco-friendly: LED lighting contains no mercury, toxins and other pollution elements. The bulbs emit no ultra violet (UV) light, and so they don't attract bugs. 
  • Safety in use: LED light doesn’t utilize any gas found in fluorescent lamps, or any fragile components such as glass and filament. So it is shockproof, and very safe and easy to transport and install. LED lights work under low thermal and don't generate much heat, so they are cool to the touch. In comparison, incandescent lighting expels 90% of the energy it consumes via heat, making the bulbs hot to the touch.