diff --git a/src/gl/dynlights/a_dynlight.cpp b/src/gl/dynlights/a_dynlight.cpp
index 0e52eedd8a..84e1d9ab1b 100644
--- a/src/gl/dynlights/a_dynlight.cpp
+++ b/src/gl/dynlights/a_dynlight.cpp
@@ -67,6 +67,7 @@
 #include "templates.h"
 #include "doomdata.h"
 #include "r_utility.h"
+#include "p_local.h"
 #include "portal.h"
 #include "doomstat.h"
 #include "serializer.h"
@@ -192,6 +193,7 @@ void ADynamicLight::BeginPlay()
 
 	m_Radius[0] = args[LIGHT_INTENSITY];
 	m_Radius[1] = args[LIGHT_SECONDARY_INTENSITY];
+	specialf1 = DAngle(double(SpawnAngle)).Normalized360().Degrees;
 	visibletoplayer = true;
 }
 
@@ -228,7 +230,7 @@ void ADynamicLight::Activate(AActor *activator)
 
 	if (lighttype == PulseLight)
 	{
-		float pulseTime = Angles.Yaw.Degrees / TICRATE;
+		float pulseTime = specialf1 / TICRATE;
 		
 		m_lastUpdate = level.maptime;
 		m_cycler.SetParams(float(m_Radius[1]), float(m_Radius[0]), pulseTime);
@@ -293,7 +295,7 @@ void ADynamicLight::Tick()
 	case FlickerLight:
 	{
 		BYTE rnd = randLight();
-		float pct = Angles.Yaw.Degrees / 360.f;
+		float pct = specialf1 / 360.f;
 		
 		m_currentRadius = float(m_Radius[rnd >= pct * 255]);
 		break;
@@ -304,12 +306,13 @@ void ADynamicLight::Tick()
 		int flickerRange = m_Radius[1] - m_Radius[0];
 		float amt = randLight() / 255.f;
 		
-		m_tickCount++;
-		
-		if (m_tickCount > Angles.Yaw.Degrees)
+		if (m_tickCount > specialf1)
+		{
+			m_tickCount = 0;
+		}
+		if (m_tickCount++ == 0 || m_currentRadius > m_Radius[1])
 		{
 			m_currentRadius = float(m_Radius[0] + (amt * flickerRange));
-			m_tickCount = 0;
 		}
 		break;
 	}
@@ -319,7 +322,7 @@ void ADynamicLight::Tick()
 	case ColorFlickerLight:
 	{
 		BYTE rnd = randLight();
-		float pct = Angles.Yaw.Degrees/360.f;
+		float pct = specialf1/360.f;
 		
 		m_currentRadius = m_Radius[rnd >= pct * 255];
 		break;
@@ -332,7 +335,7 @@ void ADynamicLight::Tick()
 		
 		m_tickCount++;
 		
-		if (m_tickCount > Angles.Yaw.Degrees)
+		if (m_tickCount > specialf1)
 		{
 			m_currentRadius = m_Radius[0] + (amt * flickerRange);
 			m_tickCount = 0;
@@ -359,7 +362,6 @@ void ADynamicLight::Tick()
 		m_currentRadius = float(m_Radius[0]);
 		break;
 	}
-
 	UpdateLocation();
 }
 
@@ -416,6 +418,7 @@ void ADynamicLight::UpdateLocation()
 			intensity = m_currentRadius;
 		}
 		radius = intensity * 2.0f;
+		assert(radius >= m_currentRadius * 2);
 
 		if (X() != oldx || Y() != oldy || radius != oldradius)
 		{
diff --git a/src/gl/dynlights/gl_dynlight.cpp b/src/gl/dynlights/gl_dynlight.cpp
index 40008e3ad5..63ddfee605 100644
--- a/src/gl/dynlights/gl_dynlight.cpp
+++ b/src/gl/dynlights/gl_dynlight.cpp
@@ -164,7 +164,7 @@ FLightDefaults::FLightDefaults(FName name, ELightType type)
 void FLightDefaults::ApplyProperties(ADynamicLight * light) const
 {
 	light->lighttype = m_type;
-	light->Angles.Yaw.Degrees = m_Param;
+	light->specialf1 = m_Param;
 	light->SetOffset(m_Pos);
 	light->halo = m_halo;
 	for (int a = 0; a < 3; a++) light->args[a] = clamp<int>((int)(m_Args[a]), 0, 255);
@@ -174,6 +174,7 @@ void FLightDefaults::ApplyProperties(ADynamicLight * light) const
 	if (m_subtractive) light->flags4 |= MF4_SUBTRACTIVE;
 	if (m_additive) light->flags4 |= MF4_ADDITIVE;
 	if (m_dontlightself) light->flags4 |= MF4_DONTLIGHTSELF;
+	light->m_tickCount = 0;
 }
 
 
@@ -431,6 +432,14 @@ void gl_ParsePulseLight(FScanner &sc)
 				sc.ScriptError("Unknown tag: %s\n", sc.String);
 			}
 		}
+		if (defaults->GetArg(LIGHT_INTENSITY) > defaults->GetArg(LIGHT_SECONDARY_INTENSITY))
+		{
+			auto i = defaults->GetArg(LIGHT_INTENSITY);
+			auto j = defaults->GetArg(LIGHT_SECONDARY_INTENSITY);
+			defaults->SetArg(LIGHT_INTENSITY, j);
+			defaults->SetArg(LIGHT_SECONDARY_INTENSITY, i);
+		}
+
 		gl_AddLightDefaults(defaults);
 	}
 	else
@@ -1082,7 +1091,7 @@ void gl_AttachLight(AActor *actor, unsigned int count, const FLightDefaults *lig
 		light->target = actor;
 		light->owned = true;
 		light->ObjectFlags |= OF_Transient;
-		light->flags4 |= MF4_ATTENUATE;
+		//light->flags4 |= MF4_ATTENUATE;
 		actor->dynamiclights.Push(light);
 	}
 	light->flags2&=~MF2_DORMANT;
diff --git a/src/gl/dynlights/gl_dynlight.h b/src/gl/dynlights/gl_dynlight.h
index c51e0c79d8..e8448890bc 100644
--- a/src/gl/dynlights/gl_dynlight.h
+++ b/src/gl/dynlights/gl_dynlight.h
@@ -128,12 +128,12 @@ private:
 protected:
 	DVector3 m_off;
 	float m_currentRadius;
-	int m_tickCount;
 	unsigned int m_lastUpdate;
 	FCycler m_cycler;
 	subsector_t * subsector;
 
 public:
+	int m_tickCount;
 	int m_Radius[2];
 	BYTE lightflags;
 	BYTE lighttype;
@@ -143,11 +143,6 @@ public:
 	bool visibletoplayer;
 	int bufferindex;
 
-	// intermediate texture coordinate data
-	// this is stored in the light object to avoid recalculating it
-	// several times during rendering of a flat
-	Vector nearPt, up, right;
-	float scale;
 
 };