Fixed alpha write.

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Hair/Lighting.hlsl

     float mtrt  = M(radians(BETA_TRT), ThetaH - radians(ALPHA_TRT));
     float3 ntrt = NTRT(CosPhi, CosHalfPhi, CosThetaD, brdfData.diffuse);
 
-    return brdfData.diffuse + (((mr * nr * 1) + (mtt * ntt * 1) + (mtrt * ntrt * 1)) / (CosThetaD * CosThetaD));
+    return brdfData.diffuse + (1.5 * ((mr * nr * 1) + (mtt * ntt * 1) + (mtrt * ntrt * 5)) / (CosThetaD * CosThetaD));
 }
 
 half3 HairGlobalIllumination(BRDFData brdfData, half3 bakedGI, half occlusion, half3 normalWS, half3 viewDirectionWS,

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Hair/LightweightPassLit.hlsl

     half4 color = LightweightFragmentPBR(inputData, surfaceData.albedo, surfaceData.metallic, surfaceData.specular, surfaceData.smoothness, surfaceData.occlusion, surfaceData.emission, surfaceData.alpha, -IN.binormal);
 
     ApplyFog(color.rgb, inputData.fogCoord);
-    return half4(color.rgb, 1);
+    return color;
 }
 
 // Used for Standard shader

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Foliage.meta

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