diff --git a/light9/collector/output.py b/light9/collector/output.py
--- a/light9/collector/output.py
+++ b/light9/collector/output.py
@@ -177,7 +177,7 @@ class Udmx(BackgroundLoopOutput):
     u._transmit([255, 0, 0, ...
     """
 
-    def __init__(self, uri: URIRef, bus: int, address: int, lastDmxChannel: int, rate=22):
+    def __init__(self, uri: URIRef, bus: int, address: int, lastDmxChannel: int, rate: float):
         self.bus = bus
         self.address = address
         self.lastDmxChannel = lastDmxChannel