What is a LED?


Consider selecting light sources (light bulbs) that have a high CRI (color rendering index) like clearly explained in the chart above. This metric though possibly changing to CQS shortly (color quality scale) is still extremely helpful in areas where the true color of an object is needed to be known. So by selecting a high CRI you will be able to accurately see the doneness of your cooking, the colors in your clothing selections and best see skin tone/color.


CCT (color correlated temperature) is how you pick the actual color of the light being emitted. If you are thinking this a foreign concept you probably already have been changing this in your space if you ever used a dimmer. In effect when you dim a typical Incandescent/Halogen bulb it makes the light bulb appear more yellow- warmer and this means a (lower Kelvin) approximately 2,800 and below temperature and conversely you can pick lamps that appear cooler (higher Kelvin) approximately 3,100 and above temperature feel which typically appears more blue-cool. There is some fascinating research going on about how the color of light specifically in the blue spectrum can enhance mood…have some fun and try in your office. See photo above


Lumens are a measure of brightness or more technically a unit of luminous flux emitted from a lamp in all directions. The light flux falling on a surface one square foot in area, every part of which is one foot from a point source having a luminous intensity of one candela in all directions. Lumen does not take into account color of light (from the electromagnetic spectrum).


Calculate your electric cost

Lightbulb Wattage (wH/hr)

Cost of Electricity (per kWh - avg = 13¢)

Amount used per day

Days used per month

Kilowatt Hours used: kWh/mo.
Cost per month: $
Cost per year: $

What is a LED?

  • What is a led…from a lighting designers perspective.
    Set of color LEDs
    The acronym Led stands for “Light emitting diode” the most common definition of this technology is a Led is a semiconductor. This light source is created when electricity (voltage/current) is applied in a precise fashion and electroluminescence occurs and this light is with in the spectrum the organs of sight – (your eyes)… can see! But in my experience what buyers of Led light bulbs...
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