void final_1(String color, int duration)
    {
        // exponential backof
        int delay_ms = 50; // ms
        int exponential_delay = 500;
        float rate = 1.1;
        int min_delay = 20;
        unsigned long timer = millis();

        CRGB parsed_color = get_color(color);
        while (millis() - timer < duration)
        {
            for (int j = 0; j < NUM_LEDS; j++)
            {
                leds[j] = parsed_color;
            }
            FastLED.show();
            delay(exponential_delay);
            turn_off_leds();
            delay(exponential_delay);
            if (exponential_delay < min_delay)
            {
                exponential_delay = min_delay;
            } else {
                exponential_delay = exponential_delay / rate;
            }
        }
    }