Bi Pin light bulbs invented by Westinghouse were used as early as 1893 after they won the contract to light the Chicago Worlds Fair and were really born out of a case of sour grapes. Basically the Edison bulb which was already being used (the typical screw in base) was patented at the time by General Electric and after they were not awarded the contract to light the Worlds Fair would not let Westinghouse use their light bulb, So Westinghouse invented the Bi Pin light bulb.
Today’s Bi Pin light bulbs (including LED Bi Pin bulbs) are measured in mille meters- center pin to center pin and typically range in size from G4- 4.0 mm to GX53- 53 mm. Manufactures also like to specify these varying pin widths to help guide replacement bulbs to the right specification, so the fixture is potentially not over or under lamped causing damage to the fixture or creating a fire hazard.
When replacing LED Bi Pin light bulbs the pin widths should be considered.
Lighting Facts CRI 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.
CCT 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.
Lumens 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.
CRI 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.
CCT 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.
Lumens 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.
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