> For the complete documentation index, see [llms.txt](https://docs.d5render.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.d5render.com/user-guide/common-pop-up-windows/why-prompt-the-number-of-caustic-lights-cannot-exceed-64.md).

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

<figure><img src="/files/NJxjxPdsRQMhARTNz7X6" alt=""><figcaption><p>Caustic Lights</p></figcaption></figure>

Currently a maximum of 64 light sources are supported with the Caustic effect turned on at the same time.&#x20;

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