# Setting MeshStandardMaterials.lights to false yields errors
**URL:** https://discourse.threejs.org/t/setting-meshstandardmaterials-lights-to-false-yields-errors/8106
**Category:** Questions
**Tags:** materials
**Created:** [June 14, 2019, 11:51am UTC](https://discourse.threejs.org/t/setting-meshstandardmaterials-lights-to-false-yields-errors/8106 "2019-06-14T11:51:57Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@michaelvbe](https://discourse.threejs.org/u/michaelvbe)
#### Post date: [June 14, 2019, 11:51am UTC](https://discourse.threejs.org/t/setting-meshstandardmaterials-lights-to-false-yields-errors/8106/1 "2019-06-14T11:51:57Z")
I’m trying to conditionally let lights affect materials (presence of lightMap), but setting `lights = false` on `MeshStandardMaterial` yields errors and the mesh disappears from the scene.
The following error is thrown at ~3 errors per second:
```auto
three.module.js:11061 Uncaught TypeError: Cannot read property 'toArray' of undefined
at flatten (three.module.js:11061)
at PureArrayUniform.setValueV3fArray [as setValue] (three.module.js:11400)
at Function.push../node_modules/three/build/three.module.js.WebGLUniforms.upload (three.module.js:11628)
at setProgram (three.module.js:16866)
at WebGLRenderer.renderBufferDirect (three.module.js:16068)
at renderObject (three.module.js:16535)
at renderObjects (three.module.js:16516)
at WebGLRenderer.render (three.module.js:16393)
at Viewer.render (Viewer.js:80)
at Viewer.js:70
```
I’m not sure if this is a Three.JS bug or a bug in my code but i wouldn’t know where to go from here.
Greetings,
Michael
---
### Author:  [@Mugen87](https://discourse.threejs.org/u/Mugen87)
#### Post date: [June 14, 2019, 12:30pm UTC](https://discourse.threejs.org/t/setting-meshstandardmaterials-lights-to-false-yields-errors/8106/2 "2019-06-14T12:30:20Z")
The `light` property can only be changed for `ShaderMaterial` and `RawShaderMaterial`. For all other materials it is considered to be read-only.
I’ve tried to clarify the docs once but unfortunately the PR was not merged:
>
---
### Author:  [@michaelvbe](https://discourse.threejs.org/u/michaelvbe)
#### Post date: [June 14, 2019, 12:51pm UTC](https://discourse.threejs.org/t/setting-meshstandardmaterials-lights-to-false-yields-errors/8106/3 "2019-06-14T12:51:19Z")
Ah, that’s a shame.
Would you know of a way to get lightMaps working in `MeshStandardMaterial`?
Currently it doesn’t really work when there is light (`AmbientLight`) as light maps are additive if i understand correctly.
I don’t really have a good background in 3d modelling and materials sadly.
---
### Author:  [@Mugen87](https://discourse.threejs.org/u/Mugen87)
#### Post date: [June 14, 2019, 2:56pm UTC](https://discourse.threejs.org/t/setting-meshstandardmaterials-lights-to-false-yields-errors/8106/4 "2019-06-14T14:56:28Z")
If you want to use an unlit material with a light map, use [MeshBasicMaterial](https://threejs.org/docs/index.html#api/en/materials/MeshBasicMaterial) instead.