diff --git a/src/lib.rs b/src/lib.rs
index ddd026c..432b3b7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -328,7 +328,7 @@ impl Core {
 		}
 		let light_at = {
 			let sigma2 = args.accum_sigma.powi(2);
-			let accum_normalizator = (2. * PI * sigma2).sqrt().recip();
+			let accum_normalizator = (2. * PI * sigma2).recip();
 			let hits = &hits;
 			move |hit: Hit| -> f32 {
 				let mut total_cd = 0.0f32;
diff --git a/ui/src/main_window.cxx b/ui/src/main_window.cxx
index 11ae0f2..75861e6 100644
--- a/ui/src/main_window.cxx
+++ b/ui/src/main_window.cxx
@@ -52,8 +52,8 @@ void PhotonLight::updateView() {
 	m_ui->lightYawLabel->setText(tr("Yaw: %1 deg").arg(QString::number(qRadiansToDegrees(args.light_position.yaw))));
 	m_ui->lightPitchLabel->setText(tr("Pitch: %1 deg").arg(QString::number(qRadiansToDegrees(args.light_position.pitch))));
 	m_ui->lightDistanceLabel->setText(tr("Distance: %1").arg(QString::number(args.light_position.distance)));
-	m_ui->accumSigmaLabel->setText(tr("Averaging radius: %1").arg(QString::number(args.accum_sigma, 'f', 3)));
-	m_ui->accumScaleLabel->setText(tr("Brightness: %1").arg(QString::number(args.accum_scale, 'f', 3)));
+	m_ui->accumSigmaLabel->setText(tr("Averaging radius: %1").arg(QString::number(args.accum_sigma, 'f', 5)));
+	m_ui->accumScaleLabel->setText(tr("Brightness: %1").arg(QString::number(args.accum_scale, 'f', 5)));
 	m_ui->viewport->setView(args);
 }
 
diff --git a/ui/src/main_window.ui b/ui/src/main_window.ui
index 5802a1d..150d5e0 100644
--- a/ui/src/main_window.ui
+++ b/ui/src/main_window.ui
@@ -245,7 +245,7 @@
            <number>0</number>
           </property>
           <property name="value">
-           <number>-40</number>
+           <number>-45</number>
           </property>
           <property name="orientation">
            <enum>Qt::Horizontal</enum>
@@ -271,7 +271,7 @@
            <number>0</number>
           </property>
           <property name="value">
-           <number>-50</number>
+           <number>-85</number>
           </property>
           <property name="orientation">
            <enum>Qt::Horizontal</enum>