Added a light attenuation falloff in the shader to prevent the hardcutoff at the light range. Better is to use a light texture falloff but as off now _LightTexture0 is not passed in SRP. We can create one later.

Assets/ScriptableRenderPipeline/LightweightPipeline/Shaders/LightweightPipelineLighting.cginc

     posToLight -= posWorld * lightInput.pos.w;
 
     float distanceSqr = max(dot(posToLight, posToLight), 0.001);
+
+    float dist = sqrt(distanceSqr);
+
+    // TODO: compute light attenuation from texture to save ALU. Builtin _LightTexture0 not set from SRP but we can create one.
+    // light attenuation with falloff.
+    // lightInput.atten.z = kQuadFallOff = (25.0) / (lightRange * lightRange)
+    // lightInput.atten.w = lightRange * lightRange
+    // TODO: we can precompute 1.0 / (lightInput.atten.w * 0.64 - lightInput.atten.w)
+    // falloff is computed from 80% light range squared
+    float falloff = saturate((distanceSqr - lightInput.atten.w) / (lightInput.atten.w * 0.64 - lightInput.atten.w));
+    lightAtten *= falloff;
-
-    half cutoff = step(distanceSqr, lightInput.atten.w);
-    lightAtten *= cutoff;
 
     half NdotL = saturate(dot(normal, lightDir));