Çözüm yolu belli oldu:
https://plus.google.com/105509168812847732602/posts/2gWA97KBu5B
In setup you have:
SET_MAX_POWER_IN_VOLTS_AND_MILLIAMPS(5, 500); // FASTLED POWER MANAGEMENT SET AT 5V, 500MA. TO CAP THE POWER USAGE AT 500MA. BUT THEN, IN YOUR LOOP YOU HAVE: FASTLED.SETBRIGHTNESS( BRIGHT ); FASTLED.SHOW(); ///// BPM CODE END //// SHOW_AT_MAX_BRIGHTNESS_FOR_POWER(); // POWER MANAGED DISPLAY YOU ARE CALLING BOTH FASTLED.SHOW() AND SHOW_AT_MAX_BRIGHTNESS_FOR_POWER. I CAN GUARUNTEE YOU THAT SHOW_AT_MAX_BRIGHTNESS_FOR_POWER IS GOING TO PULL THE BRIGHTNESS DOWN PRETTY FAR FOR 300 LEDS WITH A 500MA CAP. SO, AS YOUR BRIGHT VALUE GOES UP - YOU WILL HAVE A CALL TO SHOW WHERE THE BRIGHTNESS WILL BE HIGH, SAY, 200, OR 240, OR SUCH. THEN IMMEDIATELY AFTER THAT YOU HAVE A SHOW_AT_MAX_BRIGHTNESS_FOR_POWER WHICH WILL BE A LOT LOWER - AND THERE'S YOUR FLICKERING.
Bir de şu var: https://github.com/FastLED/FastLED/issues/89
FLICKER ÇÖZÜM
//set_max_power_in_volts_and_milliamps(5, 500); //
//show_at_max_brightness_for_power(); //