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Adjustable Color LED Lights

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Little Bill

Little Bill

Moderator
Staff member
Location
Tennessee NEC:2017
Occupation
Semi-Retired Electrician
A lot of LED lighting has adjustable color (2700K, 3000K, 4000K, etc.) temperature selection. They have a slide switch that you move to the desired color. What exactly is the switch doing, and how does that change the color temperature?
 
LarryFine

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
Usually, there are two sets of chips; one set the coolest, the other the warmest. Intermediate colors are made by mixing proportionate levels of the two. Theoretically, the longest chip life is attained at the middle setting.
 
Kansas Mountain

Kansas Mountain

Senior Member
Location
Oklahoma, United States
Occupation
Lighting and Lighting Control Designs
What LarryFine said is correct, and in my experience the most common method.

An alternate method is to have redundant sets of different color chips. This is more costly, but allows more consistent lumen output across the different color temperatures. With the more cost effective method, when you have the fixtures set to 100% output, you will have significantly different delivered lumen levels across your varying color temps.
 
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