Brightness (Lumens)

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What you see

Brightness (lumens)
CRI Color Rendering Index
Color Temperature (Kelvin)

Energy Use
Watts
Energy Cost
Lifespan


Bulb Specs
Bulb size
Base type
Bulb finish


Other topics
retrofit vs. new install
ballast bypass
LED drivers
lighting controls
Understanding Brightness (lumens)

   One of the most important things to know about a bulb or fixture is the amount of light that it produces. The brightness of a bulb can determine how many light fixtures are required in a room, or whether you need to use an alternative lighting source, such as a lamp. Since LEDs were introduced, a measurement for brightness, lumens, has started to take center stage. Previously most consumer grade lights used wattage as a shorthand for brightness. A 60-watt bulb creates so much light, and a 100-watt lamp creates more. 

   LED lights made the wattage shorthand unusable, as a 20-watt LED could produce as much light as a 60-watt incandescent, and technology has continued to improve so that today even an 8-watt LED can produce as much light as a 60-watt equivalent. In fact many brands packaged their bulbs by noting the incandescent equivalent. But as LED has started to become the norm, rather than the exception it made more sense to begin educate the public on how lights should be measured accurately. It also assured consumers that the lights they were buying still produced the same amount of light, despite the lower wattage.

What is a lumen? 

   A lumen is technical scientific term for the quantity of light leaving a lamp. If you want a technical, and exact definition, you can find that HERE. What you need to know is that light bulbs and fixtures have become more energy efficient, meaning they are creating the same amount to light while using less energy. This is because LED is better at turning electricity into what we want (light) while not wasting energy on what we don't want (heat). This efficiency also helps LED lamps work longer, as they are not subjected to harsh heat day in and day out. While an incandescent bulb often had to be changed at least once a year, LED bulbs can go decades without needing replacement.
lumens per watt
source: Westinghouse Lighting