diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/block/decorative/LaboratoryLamp.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/block/decorative/LaboratoryLamp.kt
index 1392e4894..b6e107560 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/block/decorative/LaboratoryLamp.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/block/decorative/LaboratoryLamp.kt
@@ -185,8 +185,9 @@ class LaboratoryLamp(val invertRedstone: Boolean) : Block(Properties.of(Material
 
 				if (shouldBeLit) {
 					if (targetState.isAir && targetState.block != MBlocks.LABORATORY_LAMP_LIGHT) {
-						level.setBlockAndUpdate(target, MBlocks.LABORATORY_LAMP_LIGHT.defaultBlockState().setValue(
-							FACING_FULL, -facing))
+						level.setBlockAndUpdate(target, MBlocks.LABORATORY_LAMP_LIGHT.defaultBlockState()
+							.setValue(FACING_FULL, facing.opposite)
+						)
 					}
 				} else {
 					if (targetState.block == MBlocks.LABORATORY_LAMP_LIGHT) {