diff --git a/main.c b/main.c
index d5e472c..37babd9 100644
--- a/main.c
+++ b/main.c
@@ -169,9 +169,9 @@ static void clock_clear(void)
  */
 static void clock_show_time(uint32_t time)
 {
-	uint32_t led_hour = (WS2812B_LEDS*(255*(uint64_t)(time%ticks_midday)))/ticks_midday; // scale to LED brightnesses for hours
-	uint32_t led_minute = (WS2812B_LEDS*(255*(uint64_t)(time%ticks_hour)))/ticks_hour; // scale to LED brightnesses for minutes
-	if (led_hour>=WS2812B_LEDS*255 || led_minute>=WS2812B_LEDS*255) { // a calculation error occurred
+	uint32_t led_hour = (WS2812B_LEDS*(256*(uint64_t)(time%ticks_midday)))/ticks_midday; // scale to LED brightnesses for hours
+	uint32_t led_minute = (WS2812B_LEDS*(256*(uint64_t)(time%ticks_hour)))/ticks_hour; // scale to LED brightnesses for minutes
+	if (led_hour>=WS2812B_LEDS*256 || led_minute>=WS2812B_LEDS*256) { // a calculation error occurred
 		return;
 	}
 	// show hours and minutes on LEDs
@@ -226,17 +226,18 @@ static void clock_show_time(uint32_t time)
 	if (time%ticks_minute==0) {
 		return;
 	}
-	uint16_t led_second = (WS2812B_LEDS*(time%ticks_minute))/ticks_minute; // get LED for seconds
-	uint8_t brightness_second = (255*(time%ticks_second))/ticks_second; // get brightness for seconds
+	uint32_t led_second = (WS2812B_LEDS*(256*(uint64_t)(time%ticks_minute)))/ticks_minute; // scale to LED brightnesses for seconds
+	uint8_t brightness_second = led_second%256; // get brightness for seconds for last LED
+	uint16_t second_led = (WS2812B_LEDS*(time%ticks_minute))/ticks_minute; // get LED for seconds (we only use the last LED as runner instead of all LEDs as arc)
 	// set seconds LED
-	clock_leds[led_second*3+0] = brightness_second;
-	//clock_leds[led_second*3+1] = 0; // clear other colors (minutes/hours indication)
-	//clock_leds[led_second*3+2] = 0; // clear other colors (minutes/hours indication)
+	clock_leds[second_led*3+0] = brightness_second;
+	//clock_leds[second_led*3+1] = 0; // clear other colors (minutes/hours indication)
+	//clock_leds[second_led*3+2] = 0; // clear other colors (minutes/hours indication)
 	// set previous seconds LED
-	led_second = ((led_second==0) ? WS2812B_LEDS-1 : led_second-1); // previous LED
-	clock_leds[led_second*3+0] = 0xff-brightness_second;
-	//clock_leds[led_second*3+1] = 0; // clear other colors (minutes/hours indication)
-	//clock_leds[led_second*3+2] = 0; // clear other colors (minutes/hours indication)
+	second_led = ((second_led==0) ? WS2812B_LEDS-1 : second_led-1); // previous LED
+	clock_leds[second_led*3+0] = 0xff-brightness_second;
+	//clock_leds[second_led*3+1] = 0; // clear other colors (minutes/hours indication)
+	//clock_leds[second_led*3+2] = 0; // clear other colors (minutes/hours indication)
 }
 
 /** @brief set the LEDs