diff --git a/libsrc/leddevice/LedDeviceAPA102.cpp b/libsrc/leddevice/LedDeviceAPA102.cpp
index 2af01acf..26a21f72 100644
--- a/libsrc/leddevice/LedDeviceAPA102.cpp
+++ b/libsrc/leddevice/LedDeviceAPA102.cpp
@@ -3,6 +3,7 @@
 #include <cstring>
 #include <cstdio>
 #include <iostream>
+#include <algorithm>
 
 // Linux includes
 #include <fcntl.h>
@@ -21,14 +22,18 @@ LedDeviceAPA102::LedDeviceAPA102(const std::string& outputDevice, const unsigned
 int LedDeviceAPA102::write(const std::vector<ColorRgb> &ledValues)
 {
 	const unsigned int startFrameSize = 4;
-	const unsigned int endFrameSize = (ledValues.size() + 63) / 64 * 4;
+	const unsigned int endFrameSize = std::max<unsigned int>(((ledValues.size() + 15) / 16), 4);
 	const unsigned int mLedCount = (ledValues.size() * 4) + startFrameSize + endFrameSize;
 	if(_ledBuffer.size() != mLedCount){
-		_ledBuffer.resize(mLedCount, 0x00);
+		_ledBuffer.resize(mLedCount, 0xFF);
+		_ledBuffer[0] = 0x00; 
+		_ledBuffer[1] = 0x00; 
+		_ledBuffer[2] = 0x00; 
+		_ledBuffer[3] = 0x00; 
 	}
-
+	
 	for (unsigned iLed=1; iLed<=ledValues.size(); ++iLed) {
-		const ColorRgb& rgb = ledValues[iLed];
+		const ColorRgb& rgb = ledValues[iLed-1];
 		_ledBuffer[iLed*4]   = 0xFF;
 		_ledBuffer[iLed*4+1] = rgb.red;
 		_ledBuffer[iLed*4+2] = rgb.green;
diff --git a/libsrc/leddevice/LedDeviceAdalightApa102.cpp b/libsrc/leddevice/LedDeviceAdalightApa102.cpp
index 172e76de..07732080 100644
--- a/libsrc/leddevice/LedDeviceAdalightApa102.cpp
+++ b/libsrc/leddevice/LedDeviceAdalightApa102.cpp
@@ -3,6 +3,7 @@
 #include <cstring>
 #include <cstdio>
 #include <iostream>
+#include <algorithm>
 
 // Linux includes
 #include <fcntl.h>
@@ -23,10 +24,10 @@ LedDeviceAdalightApa102::LedDeviceAdalightApa102(const std::string& outputDevice
 int LedDeviceAdalightApa102::write(const std::vector<ColorRgb> & ledValues)
 {
 	const unsigned int startFrameSize = 4;
-	const unsigned int endFrameSize = (ledValues.size() + 63) / 64 * 4;
+	const unsigned int endFrameSize = std::max<unsigned int>(((ledValues.size() + 15) / 16), 4);
 	const unsigned int mLedCount = (ledValues.size() * 4) + startFrameSize + endFrameSize;
 	if(_ledBuffer.size() != mLedCount){
-		_ledBuffer.resize(mLedCount, 0x00);
+		_ledBuffer.resize(mLedCount, 0xFF);
 		_ledBuffer[0] = 'A';
 		_ledBuffer[1] = 'd';
 		_ledBuffer[2] = 'a';
@@ -36,7 +37,7 @@ int LedDeviceAdalightApa102::write(const std::vector<ColorRgb> & ledValues)
 	}
 	
 	for (unsigned iLed=1; iLed<=ledValues.size(); iLed++) {
-		const ColorRgb& rgb = ledValues[iLed];
+		const ColorRgb& rgb = ledValues[iLed-1];
 		_ledBuffer[iLed*4+6]   = 0xFF;
 		_ledBuffer[iLed*4+1+6] = rgb.red;
 		_ledBuffer[iLed*4+2+6] = rgb.green;