diff --git a/src/main/kotlin/mods/betterfoliage/CommonRefs.kt b/src/main/kotlin/mods/betterfoliage/CommonRefs.kt
index a3344c1..451b6ba 100644
--- a/src/main/kotlin/mods/betterfoliage/CommonRefs.kt
+++ b/src/main/kotlin/mods/betterfoliage/CommonRefs.kt
@@ -77,6 +77,13 @@ object CustomColors : ClassRef<Any>("net.optifine.CustomColors") {
 }
 
 // Optifine shaders
+object Shaders : ClassRef<Any>("net.optifine.shaders.Shaders") {
+    val shaderPackLoaded = FieldRef(this, "shaderPackLoaded", boolean)
+    val blockLightLevel05 = FieldRef(this, "blockLightLevel05", float)
+    val blockLightLevel06 = FieldRef(this, "blockLightLevel06", float)
+    val blockLightLevel08 = FieldRef(this, "blockLightLevel08", float)
+}
+
 object SVertexBuilder : ClassRef<Any>("net.optifine.shaders.SVertexBuilder") {
     val pushState = MethodRef(this, "pushEntity", void, long)
     val popState = MethodRef(this, "popEntity", void)
diff --git a/src/main/kotlin/mods/betterfoliage/integration/ShadersModIntegration.kt b/src/main/kotlin/mods/betterfoliage/integration/ShadersModIntegration.kt
index 7b7a050..3d5f2a7 100644
--- a/src/main/kotlin/mods/betterfoliage/integration/ShadersModIntegration.kt
+++ b/src/main/kotlin/mods/betterfoliage/integration/ShadersModIntegration.kt
@@ -1,30 +1,40 @@
 package mods.betterfoliage.integration
 
-import mods.betterfoliage.config.BlockConfig
 import mods.betterfoliage.render.pipeline.RenderCtxBase
-import mods.betterfoliage.render.pipeline.RenderCtxForge
 import mods.betterfoliage.render.pipeline.RenderCtxVanilla
+import mods.betterfoliage.resource.discovery.BakeWrapperManager
 import mods.betterfoliage.util.HasLogger
 import mods.betterfoliage.util.allAvailable
 import mods.betterfoliage.util.get
+import mods.betterfoliage.util.mapArray
 import mods.octarinecore.*
 import net.minecraft.block.BlockRenderType
 import net.minecraft.block.BlockRenderType.MODEL
 import net.minecraft.block.BlockState
 import net.minecraft.block.Blocks
 import net.minecraft.client.renderer.BufferBuilder
+import net.minecraft.util.Direction
+import net.minecraft.util.Direction.DOWN
+import net.minecraft.util.Direction.EAST
+import net.minecraft.util.Direction.NORTH
+import net.minecraft.util.Direction.SOUTH
+import net.minecraft.util.Direction.WEST
 import net.minecraft.util.math.BlockPos
 import net.minecraft.world.ILightReader
+import net.minecraftforge.client.model.pipeline.LightUtil
 import org.apache.logging.log4j.Level.INFO
 
 /**
  * Integration for ShadersMod.
  */
 object ShadersModIntegration : HasLogger() {
-    @JvmStatic val isAvailable = allAvailable(SVertexBuilder, SVertexBuilder.pushState, SVertexBuilder.popState, BlockAliases.getAliasBlockId)
+    @JvmStatic val isEffectsAvailable = allAvailable(SVertexBuilder.pushState, SVertexBuilder.popState, BlockAliases.getAliasBlockId)
+    @JvmStatic val isDiffuseAvailable = allAvailable(Shaders.shaderPackLoaded, Shaders.blockLightLevel05, Shaders.blockLightLevel06, Shaders.blockLightLevel08)
 
-    val defaultLeaves = Blocks.OAK_LEAVES.defaultState
-    val defaultGrass = Blocks.GRASS.defaultState
+    @JvmStatic val defaultLeaves = Blocks.OAK_LEAVES.defaultState!!
+    @JvmStatic val defaultGrass = Blocks.GRASS.defaultState!!
+
+    @JvmStatic var diffuseShades = Direction.values().mapArray { LightUtil.diffuseLight(it) }
 
     /**
      * Called from transformed ShadersMod code.
@@ -37,12 +47,29 @@ object ShadersModIntegration : HasLogger() {
     }
 
     init {
-        logger.log(INFO, "ShadersMod integration is ${if (isAvailable) "enabled" else "disabled" }")
+        logger.log(INFO, "ShadersMod diffuse shading integration is ${if (isDiffuseAvailable) "enabled" else "disabled" }")
+        logger.log(INFO, "ShadersMod vertex shader integration is ${if (isEffectsAvailable) "enabled" else "disabled" }")
+
+        // Recalculate the diffsuse shading values used when resources are reloaded
+        if (isDiffuseAvailable) BakeWrapperManager.onInvalidate {
+            if (Shaders.shaderPackLoaded.getStatic()) {
+                diffuseShades = Direction.values().mapArray { face ->
+                    when(face) {
+                        DOWN -> Shaders.blockLightLevel05.getStatic()
+                        WEST, EAST -> Shaders.blockLightLevel06.getStatic()
+                        NORTH, SOUTH -> Shaders.blockLightLevel08.getStatic()
+                        else -> LightUtil.diffuseLight(face)
+                    }
+                }
+            } else {
+                diffuseShades = Direction.values().mapArray { LightUtil.diffuseLight(it) }
+            }
+        }
     }
 
     /** Quads rendered inside this block will use the given block entity data in shader programs. */
     inline fun renderAs(buffer: BufferBuilder, state: BlockState, renderType: BlockRenderType, enabled: Boolean = true, func: ()->Unit) {
-        if (isAvailable && enabled) {
+        if (isEffectsAvailable && enabled) {
             val aliasBlockId = BlockAliases.getAliasBlockId.invokeStatic(state)
             val sVertexBuilder = buffer[BufferBuilder_sVertexBuilder]
             SVertexBuilder.pushState.invoke(sVertexBuilder, aliasBlockId)
diff --git a/src/main/kotlin/mods/betterfoliage/render/lighting/VanillaVertexLighter.kt b/src/main/kotlin/mods/betterfoliage/render/lighting/VanillaVertexLighter.kt
index 69435c4..53264ed 100644
--- a/src/main/kotlin/mods/betterfoliage/render/lighting/VanillaVertexLighter.kt
+++ b/src/main/kotlin/mods/betterfoliage/render/lighting/VanillaVertexLighter.kt
@@ -1,15 +1,15 @@
 package mods.betterfoliage.render.lighting
 
+import mods.betterfoliage.integration.ShadersModIntegration
 import mods.betterfoliage.model.HalfBakedQuad
 import mods.betterfoliage.util.Double3
 import mods.betterfoliage.util.EPSILON_ONE
 import mods.betterfoliage.util.EPSILON_ZERO
+import mods.betterfoliage.util.get
 import mods.betterfoliage.util.minBy
 import net.minecraft.client.renderer.color.BlockColors
 import net.minecraft.util.Direction
 import net.minecraft.util.Direction.*
-import net.minecraft.util.Direction.Axis
-import net.minecraftforge.client.model.pipeline.LightUtil
 import kotlin.math.abs
 
 class VanillaQuadLighting {
@@ -34,7 +34,7 @@ class VanillaQuadLighting {
     }
 
     fun applyDiffuseLighting(face: Direction) {
-        val factor = LightUtil.diffuseLight(face)
+        val factor = ShadersModIntegration.diffuseShades[face]
         tint[0] *= factor; tint[1] *= factor; tint[2] *= factor
     }
 }