a. Lighting system designed to work in direct drive mode
   · The combined LED forward voltage range (upper and lower)
     must fall within LED power supply’s constant current
     voltage range. For example, the LED Vf spec is 3.4~3.6V,
     when 6 are connected in series the combined Vf will be
     20.4~21.6V. In this case, a 24V unit must be selected with
     constant current region of 18~24V.Ø
   · For models with active PFC and system PF requirement is
     >0.9, load usage must be higher than as specified in the
     PFC spec. Relationship between PF and output load can be
     found in figure 1. The typical requirement is 75% load or
     above. Double check the spec for the model you are using
     to confirm actual requirement.
   · In areas with unstable AC voltage such as heavy industrial
     zone or generator supply utility, please select general usage
     LED series from table 1.

b. Lighting system designed to work with driver IC
    · The start up voltage of driver IC should be as close to the
    power supply rated voltage as possible.
    · Driver IC needs stable voltage to function properly. So, it is highly recommended to use general usage series from table 1.
    · For models with active PFC and system PF requirement is
      >0.9, load usage must be higher than as specified in the
      PFC spec. Relationship between PF and output load can be
      found in figure 1. The typical requirement is 75% load or
      above.
      · Double check the spec for the model you are using to
        confirm actual requirement. When using driver IC,
        possible system EMI issue could arise. After completing
        lighting system design, EMI must be double checked.