diff --git a/cpdctrl/led_control_device/impl/thorlabs_dc2200.py b/cpdctrl/led_control_device/impl/thorlabs_dc2200.py
index 66189d9..eae231c 100644
--- a/cpdctrl/led_control_device/impl/thorlabs_dc2200.py
+++ b/cpdctrl/led_control_device/impl/thorlabs_dc2200.py
@@ -31,6 +31,11 @@ class DC2200(LedControlDevice):
             error = self.instr.query('SYSTem:ERRor?')
             if error.startswith('+0'): break
             log.error(f"DC2200 device error during initialization: {error}")
+
+    def __del__(self):
+        self.off()
+        self.instr.close()
+
     def on(self):
         self.instr.write(f'SOURCE1:CBRightness:BRIGhtness 100')
 
diff --git a/cpdctrl/led_control_device/impl/thorlabs_ledd1b.py b/cpdctrl/led_control_device/impl/thorlabs_ledd1b.py
index 5780de7..a7a91f2 100644
--- a/cpdctrl/led_control_device/impl/thorlabs_ledd1b.py
+++ b/cpdctrl/led_control_device/impl/thorlabs_ledd1b.py
@@ -15,6 +15,7 @@ class LEDD1B(LedControlDevice):
         # self._check_arduino_software()
         
     def __del__(self):
+        self.off()
         self.arduino.close()
     
     def _check_arduino_software(self):