diff --git a/src/xyz/marsavic/gfxlab/graphics3d/raytracers/RayTracerSimple.java b/src/xyz/marsavic/gfxlab/graphics3d/raytracers/RayTracerSimple.java
index fb75055..3d06e4b 100644
--- a/src/xyz/marsavic/gfxlab/graphics3d/raytracers/RayTracerSimple.java
+++ b/src/xyz/marsavic/gfxlab/graphics3d/raytracers/RayTracerSimple.java
@@ -96,7 +96,6 @@ public class RayTracerSimple extends RayTracer {
 
 		double refractive = material.refractive().at(wavelength);
 		if (refractive != 0.0) {
-			System.out.println(refractive + " " + ray);
 			Vec3 b; // refracted light vector
 			double rInd = 1/material.refractiveIndex().at(wavelength);
 
@@ -119,7 +118,6 @@ public class RayTracerSimple extends RayTracer {
 				b = bRejection.add(bProjection);
 			}
 			double lightRefracted = sample(Ray.pd(p, b), depthRemaining - 1, wavelength);
-			System.out.println("Light: " + lightRefracted + " direction: " + b);
 			result += refractive * lightRefracted;
 		}
 		
diff --git a/src/xyz/marsavic/gfxlab/graphics3d/scene/SpectrumTest.java b/src/xyz/marsavic/gfxlab/graphics3d/scene/SpectrumTest.java
index 44208b6..2cf53ba 100644
--- a/src/xyz/marsavic/gfxlab/graphics3d/scene/SpectrumTest.java
+++ b/src/xyz/marsavic/gfxlab/graphics3d/scene/SpectrumTest.java
@@ -25,25 +25,28 @@ public class SpectrumTest extends Scene.Base {
     public SpectrumTest() {
         var materialUVWalls  = (F1<Material, Vector>) (uv -> Material.matte(1.0));
         SplineSpectrum s;
-        var materialUVWallsL = Grid.standard(w -> 0.2);
+        var materialUVWallsL = Grid.standard(w -> 1.0);
 
-        var materialUVWallsR = Grid.standard(w -> 0.3);
+        var materialUVWallsR = Grid.standard(w -> 0.1);
 
         Collection<Solid> solids = new ArrayList<>();
         Collections.addAll(solids,
-                HalfSpace.pn(Vec3.xyz(0,  0,  10), Vec3.xyz( 1,  0,  -1), materialUVWallsL),
-                HalfSpace.pn(Vec3.xyz( 0,  0,  10), Vec3.xyz(-1,  0,  -1), materialUVWallsR),
+                HalfSpace.pn(Vec3.xyz(1,  0,  10), Vec3.xyz( 1,  0,  -1), materialUVWallsL),
+                HalfSpace.pn(Vec3.xyz( -1,  0,  10), Vec3.xyz(-1,  0,  -1), materialUVWallsR),
                 HalfSpace.pn(Vec3.xyz(0,  2,  0), Vec3.xyz( 0,  -1,  0), materialUVWallsL),
                 HalfSpace.pn(Vec3.xyz(0,  -2,  10), Vec3.xyz( 0,  1,  0), materialUVWallsL),
 
-                HalfSpace.pn(Vec3.xyz( 0,  0,  8), Vec3.xyz(0,  0,  -1), uv -> Material.GLASS),
+                HalfSpace.pn(Vec3.xyz( 0,  0,  8), Vec3.xyz(0,  1,  -1), uv -> Material.GLASS.refractiveIndex(
+//                        w -> 1.6 + (w-400)/(800-400) * (1.55 - 1.6)
+                        w -> 1.5
+                )),
                 HalfSpace.pn(Vec3.xyz( 0, 0,  -6), Vec3.xyz( 0,  0,  1), materialUVWallsR)
-
-//                Ball.cr(Vec3.xyz(0.0,  0.0,  5), 0.4, uv -> Material.MIRROR)
         );
 
         Collections.addAll(lights,
-                Light.ps(Vec3.xyz(0, 0.0, -1.0), w -> 1.0)
+                Light.ps(Vec3.xyz(0, 1.0, -1.0), w -> 1.0),
+                Light.ps(Vec3.xyz(0, -1.0, 9.0), w -> 1.0)
+
         );
 
         solid = Group.of(solids);