# LIGHTINGUNITS System Variable [GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) → [System Variables](Help%20System/GSTARCAD/2026/System%20Variables/(System%20Variables).md) → [L](Help%20System/GSTARCAD/2026/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 --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables_Lgsv/LIGHTINGUNITS.html) · © Gstarsoft Co., Ltd.