diff --git a/GPU/Directx9/VertexShaderGeneratorDX9.cpp b/GPU/Directx9/VertexShaderGeneratorDX9.cpp
index 406816031e5c..a0f29a985f7d 100644
--- a/GPU/Directx9/VertexShaderGeneratorDX9.cpp
+++ b/GPU/Directx9/VertexShaderGeneratorDX9.cpp
@@ -586,7 +586,7 @@ void GenerateVertexShaderHLSL(const VShaderID &id, char *buffer, ShaderLanguage
 			if (poweredDiffuse) {
 				// pow(0.0, 0.0) may be undefined, but the PSP seems to treat it as 1.0.
 				// Seen in Tales of the World: Radiant Mythology (#2424.)
-				WRITE(p, "  if (u_matspecular.a == 0.0) {\n");
+				WRITE(p, "  if (u_matspecular.a <= 0.0) {\n");
 				WRITE(p, "    ldot = 1.0;\n");
 				WRITE(p, "  } else {\n");
 				WRITE(p, "    ldot = pow(max(ldot, 0.0), u_matspecular.a);\n");
@@ -607,7 +607,7 @@ void GenerateVertexShaderHLSL(const VShaderID &id, char *buffer, ShaderLanguage
 			case GE_LIGHTTYPE_UNKNOWN:
 				WRITE(p, "  angle = length(u_lightdir%i) == 0.0 ? 0.0 : dot(normalize(u_lightdir%i), toLight);\n", i, i);
 				WRITE(p, "  if (angle >= u_lightangle_spotCoef%i.x) {\n", i);
-				WRITE(p, "    lightScale = clamp(1.0 / dot(u_lightatt%i, float3(1.0, distance, distance*distance)), 0.0, 1.0) * (u_lightangle_spotCoef%i.y == 0.0 ? 1.0 : pow(angle, u_lightangle_spotCoef%i.y));\n", i, i, i);
+				WRITE(p, "    lightScale = clamp(1.0 / dot(u_lightatt%i, float3(1.0, distance, distance*distance)), 0.0, 1.0) * (u_lightangle_spotCoef%i.y <= 0.0 ? 1.0 : pow(angle, u_lightangle_spotCoef%i.y));\n", i, i, i);
 				WRITE(p, "  } else {\n");
 				WRITE(p, "    lightScale = 0.0;\n");
 				WRITE(p, "  }\n");
@@ -621,7 +621,7 @@ void GenerateVertexShaderHLSL(const VShaderID &id, char *buffer, ShaderLanguage
 			if (doSpecular) {
 				WRITE(p, "  if (ldot >= 0.0) {\n");
 				WRITE(p, "    ldot = dot(normalize(toLight + float3(0.0, 0.0, 1.0)), worldnormal);\n");
-				WRITE(p, "    if (u_matspecular.a == 0.0) {\n");
+				WRITE(p, "    if (u_matspecular.a <= 0.0) {\n");
 				WRITE(p, "      ldot = 1.0;\n");
 				WRITE(p, "    } else {\n");
 				WRITE(p, "      ldot = pow(max(ldot, 0.0), u_matspecular.a);\n");
diff --git a/GPU/GLES/VertexShaderGeneratorGLES.cpp b/GPU/GLES/VertexShaderGeneratorGLES.cpp
index 3bbec79002f5..b2e57be7bfa7 100644
--- a/GPU/GLES/VertexShaderGeneratorGLES.cpp
+++ b/GPU/GLES/VertexShaderGeneratorGLES.cpp
@@ -680,7 +680,7 @@ void GenerateVertexShader(const VShaderID &id, char *buffer, uint32_t *attrMask,
 			if (poweredDiffuse) {
 				// pow(0.0, 0.0) may be undefined, but the PSP seems to treat it as 1.0.
 				// Seen in Tales of the World: Radiant Mythology (#2424.)
-				WRITE(p, "  if (u_matspecular.a == 0.0) {\n");
+				WRITE(p, "  if (u_matspecular.a <= 0.0) {\n");
 				WRITE(p, "    ldot = 1.0;\n");
 				WRITE(p, "  } else {\n");
 				WRITE(p, "    ldot = pow(max(ldot, 0.0), u_matspecular.a);\n");
@@ -701,7 +701,7 @@ void GenerateVertexShader(const VShaderID &id, char *buffer, uint32_t *attrMask,
 			case GE_LIGHTTYPE_UNKNOWN:
 				WRITE(p, "  angle = length(u_lightdir%i) == 0.0 ? 0.0 : dot(normalize(u_lightdir%i), toLight);\n", i, i);
 				WRITE(p, "  if (angle >= u_lightangle_spotCoef%i.x) {\n", i);
-				WRITE(p, "    lightScale = clamp(1.0 / dot(u_lightatt%i, vec3(1.0, distance, distance*distance)), 0.0, 1.0) * (u_lightangle_spotCoef%i.y == 0.0 ? 1.0 : pow(angle, u_lightangle_spotCoef%i.y));\n", i, i, i);
+				WRITE(p, "    lightScale = clamp(1.0 / dot(u_lightatt%i, vec3(1.0, distance, distance*distance)), 0.0, 1.0) * (u_lightangle_spotCoef%i.y <= 0.0 ? 1.0 : pow(angle, u_lightangle_spotCoef%i.y));\n", i, i, i);
 				WRITE(p, "  } else {\n");
 				WRITE(p, "    lightScale = 0.0;\n");
 				WRITE(p, "  }\n");
@@ -715,7 +715,7 @@ void GenerateVertexShader(const VShaderID &id, char *buffer, uint32_t *attrMask,
 			if (doSpecular) {
 				WRITE(p, "  if (ldot >= 0.0) {\n");
 				WRITE(p, "    ldot = dot(normalize(toLight + vec3(0.0, 0.0, 1.0)), worldnormal);\n");
-				WRITE(p, "    if (u_matspecular.a == 0.0) {\n");
+				WRITE(p, "    if (u_matspecular.a <= 0.0) {\n");
 				WRITE(p, "      ldot = 1.0;\n");
 				WRITE(p, "    } else {\n");
 				WRITE(p, "      ldot = pow(max(ldot, 0.0), u_matspecular.a);\n");
diff --git a/GPU/Software/Lighting.cpp b/GPU/Software/Lighting.cpp
index 5246d9124d0c..4bc4fe157695 100644
--- a/GPU/Software/Lighting.cpp
+++ b/GPU/Software/Lighting.cpp
@@ -26,7 +26,7 @@ static inline Vec3f GetLightVec(u32 lparams[12], int light) {
 }
 
 static inline float pspLightPow(float v, float e) {
-	if (e == 0.0f) {
+	if (e <= 0.0f) {
 		return 1.0f;
 	}
 	if (v > 0.0f) {
diff --git a/GPU/Vulkan/VertexShaderGeneratorVulkan.cpp b/GPU/Vulkan/VertexShaderGeneratorVulkan.cpp
index 696416201a1f..b63bac2c1d26 100644
--- a/GPU/Vulkan/VertexShaderGeneratorVulkan.cpp
+++ b/GPU/Vulkan/VertexShaderGeneratorVulkan.cpp
@@ -464,7 +464,7 @@ bool GenerateVulkanGLSLVertexShader(const VShaderID &id, char *buffer) {
 			if (poweredDiffuse) {
 				// pow(0.0, 0.0) may be undefined, but the PSP seems to treat it as 1.0.
 				// Seen in Tales of the World: Radiant Mythology (#2424.)
-				WRITE(p, "  if (light.matspecular.a == 0.0) {\n");
+				WRITE(p, "  if (light.matspecular.a <= 0.0) {\n");
 				WRITE(p, "    dot%i = 1.0;\n", i);
 				WRITE(p, "  } else {\n");
 				WRITE(p, "    dot%i = pow(max(dot%i, 0.0), light.matspecular.a);\n", i, i);
@@ -485,7 +485,7 @@ bool GenerateVulkanGLSLVertexShader(const VShaderID &id, char *buffer) {
 			case GE_LIGHTTYPE_UNKNOWN:
 				WRITE(p, "  float angle%i = length(light.dir[%i]) == 0.0 ? 0.0 : dot(normalize(light.dir[%i]), toLight);\n", i, i, i);
 				WRITE(p, "  if (angle%i >= light.angle_spotCoef[%i].x) {\n", i, i);
-				WRITE(p, "    lightScale = clamp(1.0 / dot(light.att[%i], vec3(1.0, distance, distance*distance)), 0.0, 1.0) * (light.angle_spotCoef[%i].y == 0.0 ? 1.0 : pow(angle%i, light.angle_spotCoef[%i].y));\n", i, i, i, i);
+				WRITE(p, "    lightScale = clamp(1.0 / dot(light.att[%i], vec3(1.0, distance, distance*distance)), 0.0, 1.0) * (light.angle_spotCoef[%i].y <= 0.0 ? 1.0 : pow(angle%i, light.angle_spotCoef[%i].y));\n", i, i, i, i);
 				WRITE(p, "  } else {\n");
 				WRITE(p, "    lightScale = 0.0;\n");
 				WRITE(p, "  }\n");
@@ -499,7 +499,7 @@ bool GenerateVulkanGLSLVertexShader(const VShaderID &id, char *buffer) {
 			if (doSpecular) {
 				WRITE(p, "  if (dot%i >= 0.0) {\n", i);
 				WRITE(p, "    dot%i = dot(normalize(toLight + vec3(0.0, 0.0, 1.0)), worldnormal);\n", i);
-				WRITE(p, "    if (light.matspecular.a == 0.0) {\n");
+				WRITE(p, "    if (light.matspecular.a <= 0.0) {\n");
 				WRITE(p, "      dot%i = 1.0;\n", i);
 				WRITE(p, "    } else {\n");
 				WRITE(p, "      dot%i = pow(max(dot%i, 0.0), light.matspecular.a);\n", i, i);