diff --git a/src/6.pbr/1.1.lighting/pbr.frag b/src/6.pbr/1.1.lighting/pbr.frag
index 6945762..9aaca3f 100644
--- a/src/6.pbr/1.1.lighting/pbr.frag
+++ b/src/6.pbr/1.1.lighting/pbr.frag
@@ -116,7 +116,7 @@ void main()
     
     // ambient lighting (note that the next IBL tutorial will replace 
     // this ambient lighting with environment lighting).
-    vec3 ambient = vec3(0.01) * albedo * ao;
+    vec3 ambient = vec3(0.03) * albedo * ao;
 
     vec3 color = ambient + Lo;
 
diff --git a/src/6.pbr/1.2.lighting_textured/pbr.frag b/src/6.pbr/1.2.lighting_textured/pbr.frag
index ee4b0f7..7f50426 100644
--- a/src/6.pbr/1.2.lighting_textured/pbr.frag
+++ b/src/6.pbr/1.2.lighting_textured/pbr.frag
@@ -143,7 +143,7 @@ void main()
     
     // ambient lighting (note that the next IBL tutorial will replace 
     // this ambient lighting with environment lighting).
-    vec3 ambient = vec3(0.01) * albedo * ao;
+    vec3 ambient = vec3(0.03) * albedo * ao;
     
     vec3 color = ambient + Lo;