# Why is there a distinct boundary between light and dark in the scene after using rect/strip lights?

This phenomenon may occur if the rect/strip light overlaps with the model; please adjust the position of the light source slightly to get the normal effect.

the light moved down slightly, do not overlap with model

--- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.d5render.com/user-guide/lights/why-is-there-a-distinct-boundary-between-light-and-dark-in-the-scene-after-using-rect-strip-lights.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.