Boiled it down to minimalistic piece of code to avoind any sideeffects... Here is a link to 2 different Atom Lite pieces running exactly the same software as shown below. https://photos.app.goo.gl/KBm54aqW5LbtxsWq7 This video shows them side-by-side..... They dow not in any direction behave at least a little bit similar..... Any ideas anyone? This is running on the Atom Lite now: #include <Arduino.h> #include <LiteLED.h> // Choose the LED type from the list below. // #define LED_TYPE LED_STRIP_WS2812 #define LED_TYPE LED_STRIP_SK6812 // #define LED_TYPE LED_STRIP_APA106 // #define LED_TYPE LED_STRIP_SM16703 #define LED_TYPE_IS_RGBW 1 #define LED_GPIO 27 #define LED_BRIGHT 100 static const crgb_t L_RED = 0xff0000; static const crgb_t L_GREEN = 0x00ff00; static const crgb_t L_BLUE = 0x0000ff; static const crgb_t L_WHITE = 0xe0e0e0; LiteLED myLED( LED_TYPE, LED_TYPE_IS_RGBW ); void setup() { myLED.begin( LED_GPIO, 1 ); myLED.brightness( LED_BRIGHT ); } void loop() { myLED.setPixel( 0, L_RED, 1 ); delay( 500 ); myLED.setPixel( 0, L_GREEN, 1 ); delay( 500 ); myLED.setPixel( 0, L_BLUE, 1 ); delay( 500 ); myLED.setPixel( 0, L_WHITE, 1 ); delay( 500 ); }