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Lighting Basics

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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. 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 ...
  3. 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 ...
  4. 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 ...
  5. 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 ...
  6. 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 ...
  7. 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 ...
  8. How Does The Electromagnetic Spectrum Work In Lighting The electromagnetic (EM) spectrum refers to the range of all types of EM rays. These types of rays include radio waves, microwaves, infrared light waves, ultra-violet rays, X-rays, and gamma rays. These rays have different frequencies and reside at various points of the electromagnetic spectrum. ...
  9. How the Human Eye Reads Light We cannot see if there is not any light. Human beings are able to see because of a number of complex interactions that take place between light, the eye, and the brain. There are several different parts in the human eye, and each part works in a unique manner to enable us to see. In a nutshell, ...
  10. The 6 Lighting Certifications You Need to Know As a business owner, company manager, and/or entrepreneur who wants to optimize their spending on the lighting infrastructure in their commercial premises, you need to buy those lighting devices that suit your business needs to a T and are also cost- and energy-efficient. On the other hand, you ...

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