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PF- REF.DESIGN 4715

Hi TI,

I have a problem with my led driver :

when a test with resistor (active load) PF its very good 0.95/0.99 measure instrument is from  Hameg  Instruments

but when a put the led strings PF ITS 0.6about 6(LEDS IN SERIE  - and 0.88;8LEDS IN SERIES) 

 

How is that possible?

How I can to do this schematic about 20-24 W-,and whether PF save this value?