When Brightness < ()
when brightness \< ()::extension hat
Category EV3
Type Hat
Introduced in 3.0
The correct title of this article is When Brightness < () (block). The Scratch Wiki uses this different title because of technical restrictions.

The when brightness < () block is a Hat Block in the LEGO MINDSTORMS EV3 Extension. It starts its script when the EV3's detected light volume is less than the specified value.