diff --git a/examples/screenshots/webgl_loader_md2.jpg b/examples/screenshots/webgl_loader_md2.jpg
index 6e9732e8e69ac6..52dd4b434ddb50 100644
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diff --git a/examples/screenshots/webgl_materials_normalmap.jpg b/examples/screenshots/webgl_materials_normalmap.jpg
index 59f669da19f99e..0ada7521128436 100644
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diff --git a/examples/screenshots/webgl_materials_subsurface_scattering.jpg b/examples/screenshots/webgl_materials_subsurface_scattering.jpg
index c93b20b27ae55d..f2b899d83d4a00 100644
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diff --git a/examples/screenshots/webgl_mirror.jpg b/examples/screenshots/webgl_mirror.jpg
index 2e6948b4cabda7..4d7099e4707561 100644
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diff --git a/examples/screenshots/webgl_portal.jpg b/examples/screenshots/webgl_portal.jpg
index 422c3c04e6b02a..bc399d371c0c43 100644
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diff --git a/examples/screenshots/webgl_refraction.jpg b/examples/screenshots/webgl_refraction.jpg
index 78076a50831fda..faf75a1c35a027 100644
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diff --git a/examples/screenshots/webgl_shadowmap_pointlight.jpg b/examples/screenshots/webgl_shadowmap_pointlight.jpg
index fab7dc64eabbda..45134ed9237498 100644
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diff --git a/src/lights/PointLight.js b/src/lights/PointLight.js
index 02817cf2049204..65275669167e8c 100644
--- a/src/lights/PointLight.js
+++ b/src/lights/PointLight.js
@@ -3,14 +3,14 @@ import { PointLightShadow } from './PointLightShadow.js';
 
 class PointLight extends Light {
 
-	constructor( color, intensity, distance = 0, decay = 1 ) {
+	constructor( color, intensity, distance = 0, decay = 2 ) {
 
 		super( color, intensity );
 
 		this.type = 'PointLight';
 
 		this.distance = distance;
-		this.decay = decay; // for physically correct lights, should be 2.
+		this.decay = decay;
 
 		this.shadow = new PointLightShadow();
 
diff --git a/src/lights/SpotLight.js b/src/lights/SpotLight.js
index 7c352593358007..ded1234236bcdf 100644
--- a/src/lights/SpotLight.js
+++ b/src/lights/SpotLight.js
@@ -4,7 +4,7 @@ import { Object3D } from '../core/Object3D.js';
 
 class SpotLight extends Light {
 
-	constructor( color, intensity, distance = 0, angle = Math.PI / 3, penumbra = 0, decay = 1 ) {
+	constructor( color, intensity, distance = 0, angle = Math.PI / 3, penumbra = 0, decay = 2 ) {
 
 		super( color, intensity );
 
@@ -18,7 +18,7 @@ class SpotLight extends Light {
 		this.distance = distance;
 		this.angle = angle;
 		this.penumbra = penumbra;
-		this.decay = decay; // for physically correct lights, should be 2.
+		this.decay = decay;
 
 		this.shadow = new SpotLightShadow();