# LIGHTINGUNITS System Variable [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [System Variables](Help%20System/GSTARCAD/2021/System%20Variables/(System%20Variables).md) → [L](Help%20System/GSTARCAD/2021/System%20Variables/L/(L).md) **Function Description:** The LIGHTINGUNITS system variable is used to specify whether to use generic light source or photometric lights to control light, and specify light units for drawing. | | | | --- | --- | | Type | Integer | | Saved in | Drawing | | Initial value | 2 | | Range | 0,1,2 | When specified LIGHTINGUNITS to be 1 or 2, turn on photometric light; or turn on standard light. **System Variable Value:** **0:** do not use light units and turn standard (generic) light on **1:** use the imperial light units and turn photometric light on **2:** use the metric light units and turn photometric light on --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/L/LIGHTINGUNITS%20System%20Variable--d94db86a1e24.md) · [GstarCAD 2017](Help%20System/GSTARCAD/2017/System%20Variables/L/LIGHTINGUNITS%20System%20Variable--d94db86a1e24.md) · [GstarCAD 2018](../../../2018/System%20Variables/L/LIGHTINGUNITS%20System%20Variable--d94db86a1e24.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/System%20Variables/L/LIGHTINGUNITS%20System%20Variable--d94db86a1e24.md) · [GstarCAD 2020](../../../2020/System%20Variables/L/LIGHTINGUNITS%20System%20Variable--d94db86a1e24.md) · [GstarCAD 2022](Help%20System/GSTARCAD/2022/System%20Variables/L/LIGHTINGUNITS%20System%20Variable--d94db86a1e24.md)