# Why prompt 'The number of caustic lights cannot exceed 64'?

<figure class="doc-image doc-image--stack">
  <img src="https://docs-static.d5render.com/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces/-MjbN1iGmN_HBnj_fyU9/uploads/JZPE7eD4DdMOFUrJ9fol/image.png" alt="Caustic Lights" />
  <figcaption>Caustic Lights</figcaption>
</figure>

Currently a maximum of 64 light sources are supported with the Caustic effect turned on at the same time. 

If this limit is exceeded, you will be prompted for this content.