diff --git a/firmware/20230519_firmware.ino.bin b/firmware/20230519_firmware.ino.bin
index 92f5f18..b399520 100644
Binary files a/firmware/20230519_firmware.ino.bin and b/firmware/20230519_firmware.ino.bin differ
diff --git a/firmware/20230519_firmware_dev.ino.bin b/firmware/20230519_firmware_dev.ino.bin
index c5cae4e..42f3be6 100644
Binary files a/firmware/20230519_firmware_dev.ino.bin and b/firmware/20230519_firmware_dev.ino.bin differ
diff --git a/firmware/config.h b/firmware/config.h
index 3ef78f1..cabdf72 100644
--- a/firmware/config.h
+++ b/firmware/config.h
@@ -25,7 +25,7 @@
 #define EEPROM_NM_ADDRESS                      (EEPROM_GW_ADDRESS + 4) // step 4 byte further GW
 #define EEPROM_DNS_ADDRESS                     (EEPROM_NM_ADDRESS + 4) // step 4 byte further NM
 
-#define BRI_MOD_STEPS_PER_SEC                 25
+#define BRI_MOD_STEPS_PER_SEC                  5 // 1000ms / 40ms delay in loop / 4 functions called separately by FSM => 6.25 calls of the tc update function per second maximum => 5 step should be ok
 
 #define TIME_CHECK_INTERVAL_MS         (60000UL) // 60 second interval
 #define TIME_LIGHTENGINE_INTERVAL_MS    (1000UL / BRI_MOD_STEPS_PER_SEC) // BRI_MOD_STEPS_PER_SEC steps per second to in-/decrease the brightness