diff --git a/public/js/render/board3d/materials.js b/public/js/render/board3d/materials.js
index 79ec86c9..750e15b8 100644
--- a/public/js/render/board3d/materials.js
+++ b/public/js/render/board3d/materials.js
@@ -349,9 +349,11 @@ export function smogMaterial(THREE, tex, focus) {
  * not reproduced: the albedo is lit by the baked indirect light of the scene's lightmap plus the scene's key light
  * masked by its baked shadow, in linear light (Unity's Shadowmask lighting mode). `range` — the linear light a lightmap
  * texel of 1.0 stands for when scene.json has no lightRange; [ASSUMED] `ambient` — the light of a mesh without a
- * lightmap page; `direct` / `indirect` — gains of the two terms (1 = the scene's own values).
+ * lightmap page; `direct` / `indirect` — gains of the two terms, both 1: the scene's own values (the key light's
+ * `light.intensity`, and the lightmap's baked linear light, whose texel is (L / lightRange)^(1/2.2)). Anything below 1
+ * darkens the board against the official render (issue #549).
  */
-export const SCENE_LIGHT = Object.freeze({ range: 8.0, ambient: 0.2, direct: 0.8, indirect: 0.4 });
+export const SCENE_LIGHT = Object.freeze({ range: 8.0, ambient: 0.2, direct: 1, indirect: 1 });
 
 const colorOf = (info, key, fallback = [1, 1, 1, 1]) => {
   const c = info && info.colors && Array.isArray(info.colors[key]) ? info.colors[key] : fallback;