system
Given the following post, respond as if you're commenting on Reddit:
human
(DC) How detailed are Light Constructs.

For example, if Scarecrow were to be given a Sinestro Corps Ring ( Like in  Blackest Night ) would he be able to make  a working Light Construct of his Fear Toxin?
gpt
Light constructs are limited by two things. Your imagination/knowledge and your ability to will it into existence.

For example, Kyle makes incredibly detailed constructs, but they're solid with no inner workings. However, John Stewart makes simple looking constructs, but he fills them up with inner workings because that's how his mind works.

The Scarecrow could, theoretically, create a Fear Toxin light construct, but such a complex cause/result might exceed his ability to will things into existence. As someone who controls a power ring, he'll find it easier to create terrifying constructs and seeing what scares his victims more.