diff --git a/technic/machines/HV/nuclear_reactor.lua b/technic/machines/HV/nuclear_reactor.lua
index 003ca6b..b240a9d 100644
--- a/technic/machines/HV/nuclear_reactor.lua
+++ b/technic/machines/HV/nuclear_reactor.lua
@@ -287,7 +287,7 @@ for _, state in ipairs({ "flowing", "source" }) do
 		}},
 		paramtype = "light",
 		paramtype2 = (state == "flowing" and "flowingliquid" or nil),
-		light_source = (state == "source" and 4 or 3),
+		light_source = (state == "source" and 8 or 5),
 		walkable = false,
 		pointable = false,
 		diggable = false,