4.3 LED connection

One LED does not deliver enough light. Therefore LED are connected together in order to reach desired lumen output. Exists four basic ways how to connect LEDs:

•    LEDs in serial connection
•    LEDs in parallel connection
•    LEDs in serial/parallel connection
•    LEDs in matrix connection

LEDs in serial connection

Advantages:
•    each LED uses the same current – stabilized CCT and CRI
•    high efficacy – no need of balance resistor
•    LED short-circuit defect-proof connection
•    ideal for forward current control and also PWM control
Disadvantages:
•    unstable when one LED goes to open-circuit (whole string will switch-off)
•    more expensive LED Driver

LEDs in parallel connection

Advantages:
•    cheaper LED driver
•    LED open-circuit proof
Disadvantages:
•    low efficacy
•    unstable when one LED goes to short-circuit
•    unusable for forward current control

 

LEDs in serial/parallel connection

Advantages:
•    ability to drive very high number of LEDs
•    LED open/short-circuit proof
Disadvantages:
•    lower efficacy
•    unusable for forward current control

 

LEDs in matrix connection

Advantages:
•    ability to drive very high number of LEDs
•    high efficacy
•    forward current control and PWM dimming (when constant current LED driver is used)
•    LED open/short-circuit proof
Disadvantages:
•    quite complex design of printed-circuit board

 

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