diff --git a/effects/knight-rider.py b/effects/knight-rider.py
index d855b1a2..1245336c 100644
--- a/effects/knight-rider.py
+++ b/effects/knight-rider.py
@@ -6,6 +6,10 @@ import colorsys
 speed = hyperion.args.get('speed', 1.0)
 fadeFactor = hyperion.args.get('fadeFactor', 0.7)
 
+# Check parameters
+speed = max(0.0001, speed)
+fadeFactor = max(0.0, min(fadeFactor, 1.0))
+
 # Initialize the led data
 width = 25
 imageData = bytearray(width * (0,0,0))
diff --git a/effects/rainbow-mood.py b/effects/rainbow-mood.py
index 7f3c5727..622dfd8c 100644
--- a/effects/rainbow-mood.py
+++ b/effects/rainbow-mood.py
@@ -8,6 +8,11 @@ brightness = hyperion.args.get('brightness', 1.0)
 saturation = hyperion.args.get('saturation', 1.0)
 reverse = hyperion.args.get('reverse', False)
 
+# Check parameters
+rotationTime = max(0.1, rotationTime)
+brightness = max(0.0, min(brightness, 1.0))
+saturation = max(0.0, min(saturation, 1.0))
+
 # Calculate the sleep time and hue increment
 sleepTime = 0.1
 hueIncrement = sleepTime / rotationTime
diff --git a/effects/rainbow-swirl.py b/effects/rainbow-swirl.py
index a274ace2..f8ac2522 100644
--- a/effects/rainbow-swirl.py
+++ b/effects/rainbow-swirl.py
@@ -8,6 +8,11 @@ brightness = hyperion.args.get('brightness', 1.0)
 saturation = hyperion.args.get('saturation', 1.0)
 reverse = hyperion.args.get('reverse', False)
 
+# Check parameters
+rotationTime = max(0.1, rotationTime)
+brightness = max(0.0, min(brightness, 1.0))
+saturation = max(0.0, min(saturation, 1.0))
+
 # Initialize the led data
 ledData = bytearray()
 for i in range(hyperion.ledCount):