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Lighting Learning Center

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  1. What is Color Rendering Index? Color Rendering Index, or CRI, of a light bulb refers to how a specific light source makes the color of an object in the environment appear to a person and also how the subtle variations in its shades and hues are replicated. The CRI of a light source is expressed as a number on a scale ranging ...
  2. History of the Incandescent Light Bulb Like all revolutionary inventions, the very first light bulb too was developed after a series of improvements had been made over the ideas generated by earlier inventors. So light bulbs in some rudimentary form existed before Thomas Alva Edison patented his light bulb, the one that resembles the ...
  3. What is Kelvin [Color] Temperature? The phrase “color temperature” may be misleading because it actually refers to the warmth or coolness or the color appearance of a particular source of white light. The phrase has come into being because of the peculiar way in which a metal behaves when it is heated. When a piece of metal is ...
  4. What is Average Rated Life of a Lamp or Bulb? In lighting parlance, the Average Rated Life (ARL) of a lamp or a bulb refers to the time it takes for exactly half the bulbs (50 percent) of a test sample to die out while the other half continue to burn. The ARL of a light bulb is also popularly known as half-life. It is expressed in hours and ...
  5. How to Calculate Lighting Energy Savings Because you have to pay for the electricity you consume whether it be for your home or business, you should know why you pay what you are paying. You should also understand how the various components of your electricity bill work if you want to explore measures to bring in more savings while ...
  6. How Fluorescent Ballasts Work Over the past few years, fluorescent lamps have become the lighting of choice for contractors looking to save on both energy and maintenance costs. Although fluorescent lighting may cost a bit more upfront when it comes to initial installation, it makes up for it in the amount of energy saved ...
  7. Initial vs. Mean Lumens Initial lumens and mean lumens are two units of measuring the output generated by a specific lighting device. But there are distinct differences between what these two values indicate. As a commercial space owner who wants to maximize his infrastructural investment and optimize operational ...
  8. A Brief History of LED Lighting Light-emitting diode (LED) is right now the most energy-efficient lighting technology available for use in commercial and business purposes, and it is only natural that it is also one of the most rapidly-developing technologies. LED is a kind of solid-state lighting where a semiconductor ...
  9. What is a Lumen And How Does it Work in Commercial Lighting? What is a lumen? Lumens refers to the brightness of the light emitted by a bulb or the amount of illumination in a specified area. This value is typically indicated on the packaging of the bulb. You can compare lighting apparatus of different types—halogen incandescent bulbs, CFL, or ...
  10. Lumens vs. Candela What do You need to Know About Lumens and Candela? Lumens and candela are both lighting measurement units, but they measure different aspects of a lighting device. Knowing about the difference between lumens and candela will help you choose lighting devices that suit the needs of your ...

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