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May 27, 2017 | Elissa Grohne
Lumens and Watts
In the past with incandescent bulbs, the brightness was measured in watts -- which is a measure of power. Because all 60-watt bulbs produced similar amounts of light for roughly equivalent bulb lifespans, you could use the wattage figure to identify a bulb and its brightness.
With the introduction of energy-saving bulbs, this is a less useful measure as LEDs use a lot less power to produce the same amount of light. Today's lighting marketplace uses their light output, measured in lumens, as the standard. The higher the number of lumens, the brighter the light.
About 450 to 600 lumens is good for a small table lamp, whereas you might want about 1,000 to 1,500 lumens for a larger area.
The colour of light is measured on the Kelvin scale, which is a measure of temperature. The numbers you see on the side of a bulb packet denote the colour of light that the bulb will emit. LED lamps use a mixture of red, green and blue LEDs to produce white light. How a manufacturer builds an individual LED lamp— the mixture of lighting elements and circuitry—determines the color temperature the device produces, ranging from warm to cool. A beautifully warm and cozy glow is best achieved with 2700k and offers relief from the blue screen of your office computer.
Each bulb is given a CRI score. CRI stands for Colour Rendering Index and is a measure of the ability of a light source to accurately represent different colours. The colour of light can impact your mood and productivity. A CRI value closest to 100 achieves the preferable colour of light. We love the unbreakable liquid-cooled bulb featured in our store!