diff --git a/inc/MicroBitConfig.h b/inc/MicroBitConfig.h
index 64757bc..6292d5a 100644
--- a/inc/MicroBitConfig.h
+++ b/inc/MicroBitConfig.h
@@ -261,8 +261,8 @@
 
 // Selects the minimum permissable brightness level for the device
 // in the region of 0 (off) to 255 (full brightness)
-#define MICROBIT_DISPLAY_MINIMUM_BRIGHTNESS     2     
 #ifndef MICROBIT_DISPLAY_MINIMUM_BRIGHTNESS
+#define MICROBIT_DISPLAY_MINIMUM_BRIGHTNESS     4
 #endif
 
 // Selects the maximum permissable brightness level for the device
diff --git a/source/MicroBitDisplay.cpp b/source/MicroBitDisplay.cpp
index 48c93d2..b62c46f 100644
--- a/source/MicroBitDisplay.cpp
+++ b/source/MicroBitDisplay.cpp
@@ -147,7 +147,7 @@ void MicroBitDisplay::render()
 
     //timer does not have enough resolution for brightness of 1. 23.53 us
     if(brightness != MICROBIT_DISPLAY_MAXIMUM_BRIGHTNESS && brightness > MICROBIT_DISPLAY_MINIMUM_BRIGHTNESS)
-        renderTimer.attach_us(this, &MicroBitDisplay::renderFinish, (((brightness * 100) / (MICROBIT_DISPLAY_MAXIMUM_BRIGHTNESS)) * uBit.getTickPeriod()));
+        renderTimer.attach_us(this, &MicroBitDisplay::renderFinish, (((brightness * 1000) / (MICROBIT_DISPLAY_MAXIMUM_BRIGHTNESS)) * uBit.getTickPeriod()));
 
     //this will take around 23us to execute
     if(brightness <= MICROBIT_DISPLAY_MINIMUM_BRIGHTNESS)