Tweaked default shader values to be mid grey

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightStandard.shader

         // Specular vs Metallic workflow
         [HideInInspector] _WorkflowMode("WorkflowMode", Float) = 1.0
 
-        _Color("Color", Color) = (1,1,1,1)
+        _Color("Color", Color) = (0.5,0.5,0.5,1)
         _MainTex("Albedo", 2D) = "white" {}
 
         _Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightStandardSimpleLighting.shader

     // Keep properties of StandardSpecular shader for upgrade reasons.
     Properties
     {
-        _Color("Color", Color) = (1,1,1,1)
+        _Color("Color", Color) = (0.5, 0.5, 0.5, 1)
-        _Shininess("Shininess", Range(0.01, 1.0)) = 1.0
+        _Shininess("Shininess", Range(0.01, 1.0)) = 0.5
         _GlossMapScale("Smoothness Factor", Range(0.0, 1.0)) = 1.0
 
         _Glossiness("Glossiness", Range(0.0, 1.0)) = 0.5
-        _SpecColor("Specular", Color) = (1.0, 1.0, 1.0)
+        _SpecColor("Specular", Color) = (0.5, 0.5, 0.5)
         _SpecGlossMap("Specular", 2D) = "white" {}
         [HideInInspector] _GlossinessSource("Glossiness Source", Float) = 0.0
         [ToggleOff] _SpecularHighlights("Specular Highlights", Float) = 1.0

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Terrain/LightweightStandardTerrain.shader

     {
         // set by terrain engine
         [HideInInspector] _Control("Control (RGBA)", 2D) = "red" {}
-        [HideInInspector] _Splat3("Layer 3 (A)", 2D) = "white" {}
-        [HideInInspector] _Splat2("Layer 2 (B)", 2D) = "white" {}
-        [HideInInspector] _Splat1("Layer 1 (G)", 2D) = "white" {}
-        [HideInInspector] _Splat0("Layer 0 (R)", 2D) = "white" {}
+        [HideInInspector] _Splat3("Layer 3 (A)", 2D) = "grey" {}
+        [HideInInspector] _Splat2("Layer 2 (B)", 2D) = "grey" {}
+        [HideInInspector] _Splat1("Layer 1 (G)", 2D) = "grey" {}
+        [HideInInspector] _Splat0("Layer 0 (R)", 2D) = "grey" {}
         [HideInInspector] _Normal3("Normal 3 (A)", 2D) = "bump" {}
         [HideInInspector] _Normal2("Normal 2 (B)", 2D) = "bump" {}
         [HideInInspector] _Normal1("Normal 1 (G)", 2D) = "bump" {}
         [HideInInspector][Gamma] _Metallic2("Metallic 2", Range(0.0, 1.0)) = 0.0
         [HideInInspector][Gamma] _Metallic3("Metallic 3", Range(0.0, 1.0)) = 0.0
-        [HideInInspector] _Smoothness0("Smoothness 0", Range(0.0, 1.0)) = 1.0
-        [HideInInspector] _Smoothness1("Smoothness 1", Range(0.0, 1.0)) = 1.0
-        [HideInInspector] _Smoothness2("Smoothness 2", Range(0.0, 1.0)) = 1.0
-        [HideInInspector] _Smoothness3("Smoothness 3", Range(0.0, 1.0)) = 1.0
+        [HideInInspector] _Smoothness0("Smoothness 0", Range(0.0, 1.0)) = 0.5
+        [HideInInspector] _Smoothness1("Smoothness 1", Range(0.0, 1.0)) = 0.5
+        [HideInInspector] _Smoothness2("Smoothness 2", Range(0.0, 1.0)) = 0.5
+        [HideInInspector] _Smoothness3("Smoothness 3", Range(0.0, 1.0)) = 0.5
-        [HideInInspector] _MainTex("BaseMap (RGB)", 2D) = "white" {}
+        [HideInInspector] _MainTex("BaseMap (RGB)", 2D) = "grey" {}
         [HideInInspector] _Color("Main Color", Color) = (1,1,1,1)
     }