diff --git a/QtMeshViewer/Source/SettingsWindow.cpp b/QtMeshViewer/Source/SettingsWindow.cpp
index f83b4a5..c32a4e7 100644
--- a/QtMeshViewer/Source/SettingsWindow.cpp
+++ b/QtMeshViewer/Source/SettingsWindow.cpp
@@ -33,13 +33,13 @@ SettingsWindow::SettingsWindow(QWidget * parent)
 
 	// light
 	connect(ui->light_R_LE, &QLineEdit::textChanged, [this](const QString& value){ui->light_R_S->setValue(value.toInt());});
-	connect(ui->light_R_S, &QSlider::valueChanged, [this](const int& value){ui->light_R_LE->setText(QString::number(value));});
+	connect(ui->light_R_S, &QSlider::valueChanged, [this](const int& value){ui->light_R_LE->setText(QString::number(value)); if(ui->checkAutoColor->isCecked()) ui->lightOn_R_S->setValue((int)(value / 50));});
 
 	connect(ui->light_G_LE, &QLineEdit::textChanged, [this](const QString& value){ui->light_G_S->setValue(value.toInt());});
-	connect(ui->light_G_S, &QSlider::valueChanged, [this](const int& value){ui->light_G_LE->setText(QString::number(value));});
+	connect(ui->light_G_S, &QSlider::valueChanged, [this](const int& value){ui->light_G_LE->setText(QString::number(value)); if(ui->checkAutoColor->isCecked()) ui->lightOn_G_S->setValue((int)(value / 50));});
 
 	connect(ui->light_B_LE, &QLineEdit::textChanged, [this](const QString& value){ui->light_B_S->setValue(value.toInt());});
-	connect(ui->light_B_S, &QSlider::valueChanged, [this](const int& value){ui->light_B_LE->setText(QString::number(value));});
+	connect(ui->light_B_S, &QSlider::valueChanged, [this](const int& value){ui->light_B_LE->setText(QString::number(value)); if(ui->checkAutoColor->isCecked()) ui->lightOn_B_S->setValue((int)(value / 50));});
 
 
 	connect(ui->checkAutoColor, &QCheckBox::toggled, this, &SettingsWindow::autoColorToggled);