diff --git a/homeassistant/components/wiz/config_flow.py b/homeassistant/components/wiz/config_flow.py
index 924e88793e4..7d86502784c 100644
--- a/homeassistant/components/wiz/config_flow.py
+++ b/homeassistant/components/wiz/config_flow.py
@@ -71,6 +71,12 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         try:
             bulbtype = await bulb.get_bulbtype()
         except WIZ_CONNECT_EXCEPTIONS as ex:
+            _LOGGER.debug(
+                "Failed to connect to %s during discovery: %s",
+                device.ip_address,
+                ex,
+                exc_info=True,
+            )
             raise AbortFlow("cannot_connect") from ex
         self._name = name_from_bulb_type_and_mac(bulbtype, device.mac_address)
 
diff --git a/homeassistant/components/wiz/entity.py b/homeassistant/components/wiz/entity.py
index 82f19a61002..9b22d35de7d 100644
--- a/homeassistant/components/wiz/entity.py
+++ b/homeassistant/components/wiz/entity.py
@@ -6,6 +6,7 @@ from typing import Any
 
 from pywizlight.bulblibrary import BulbType
 
+from homeassistant.const import ATTR_HW_VERSION, ATTR_MODEL
 from homeassistant.core import callback
 from homeassistant.helpers.device_registry import CONNECTION_NETWORK_MAC
 from homeassistant.helpers.entity import DeviceInfo, Entity, ToggleEntity
@@ -24,17 +25,20 @@ class WizEntity(CoordinatorEntity, Entity):
         bulb_type: BulbType = self._device.bulbtype
         self._attr_unique_id = self._device.mac
         self._attr_name = name
-        hw_data = bulb_type.name.split("_")
-        board = hw_data.pop(0)
-        model = hw_data.pop(0)
         self._attr_device_info = DeviceInfo(
             connections={(CONNECTION_NETWORK_MAC, self._device.mac)},
             name=name,
             manufacturer="WiZ",
-            model=model,
-            hw_version=f"{board} {hw_data[0]}" if hw_data else board,
             sw_version=bulb_type.fw_version,
         )
+        if bulb_type.name is None:
+            return
+        hw_data = bulb_type.name.split("_")
+        board = hw_data.pop(0)
+        model = hw_data.pop(0)
+        hw_version = f"{board} {hw_data[0]}" if hw_data else board
+        self._attr_device_info[ATTR_HW_VERSION] = hw_version
+        self._attr_device_info[ATTR_MODEL] = model
 
     @callback
     def _handle_coordinator_update(self) -> None:
diff --git a/homeassistant/components/wiz/manifest.json b/homeassistant/components/wiz/manifest.json
index 2dacb32c094..df780d7b39c 100644
--- a/homeassistant/components/wiz/manifest.json
+++ b/homeassistant/components/wiz/manifest.json
@@ -13,7 +13,7 @@
   "dependencies": ["network"],
   "quality_scale": "platinum",
   "documentation": "https://www.home-assistant.io/integrations/wiz",
-  "requirements": ["pywizlight==0.5.11"],
+  "requirements": ["pywizlight==0.5.12"],
   "iot_class": "local_push",
   "codeowners": ["@sbidy"]
 }
diff --git a/requirements_all.txt b/requirements_all.txt
index c6c0267de34..1d3e91cd65d 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -2057,7 +2057,7 @@ pywemo==0.7.0
 pywilight==0.0.70
 
 # homeassistant.components.wiz
-pywizlight==0.5.11
+pywizlight==0.5.12
 
 # homeassistant.components.xeoma
 pyxeoma==1.4.1
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index f82e28776c0..1ad42575a89 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -1288,7 +1288,7 @@ pywemo==0.7.0
 pywilight==0.0.70
 
 # homeassistant.components.wiz
-pywizlight==0.5.11
+pywizlight==0.5.12
 
 # homeassistant.components.zerproc
 pyzerproc==0.4.8
diff --git a/tests/components/wiz/__init__.py b/tests/components/wiz/__init__.py
index cb23b3eef34..c4a31b0a394 100644
--- a/tests/components/wiz/__init__.py
+++ b/tests/components/wiz/__init__.py
@@ -150,6 +150,17 @@ FAKE_SOCKET = BulbType(
     white_channels=2,
     white_to_color_ratio=80,
 )
+FAKE_OLD_FIRMWARE_DIMMABLE_BULB = BulbType(
+    bulb_type=BulbClass.DW,
+    name=None,
+    features=Features(
+        color=False, color_tmp=False, effect=True, brightness=True, dual_head=False
+    ),
+    kelvin_range=None,
+    fw_version="1.8.0",
+    white_channels=1,
+    white_to_color_ratio=80,
+)
 
 
 async def setup_integration(
diff --git a/tests/components/wiz/test_light.py b/tests/components/wiz/test_light.py
index c79cf74e130..48166e941d4 100644
--- a/tests/components/wiz/test_light.py
+++ b/tests/components/wiz/test_light.py
@@ -22,6 +22,7 @@ from homeassistant.helpers import entity_registry as er
 
 from . import (
     FAKE_MAC,
+    FAKE_OLD_FIRMWARE_DIMMABLE_BULB,
     FAKE_RGBW_BULB,
     FAKE_RGBWW_BULB,
     FAKE_TURNABLE_BULB,
@@ -169,3 +170,34 @@ async def test_turnable_light(hass: HomeAssistant) -> None:
     state = hass.states.get(entity_id)
     assert state.state == STATE_ON
     assert state.attributes[ATTR_COLOR_TEMP] == 153
+
+
+async def test_old_firmware_dimmable_light(hass: HomeAssistant) -> None:
+    """Test a light operation with a dimmable light with old firmware."""
+    bulb, _ = await async_setup_integration(
+        hass, bulb_type=FAKE_OLD_FIRMWARE_DIMMABLE_BULB
+    )
+    entity_id = "light.mock_title"
+    await hass.services.async_call(
+        LIGHT_DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: entity_id, ATTR_BRIGHTNESS: 128},
+        blocking=True,
+    )
+    pilot: PilotBuilder = bulb.turn_on.mock_calls[0][1][0]
+    assert pilot.pilot_params == {"dimming": 50, "state": True}
+
+    await async_push_update(hass, bulb, {"mac": FAKE_MAC, **pilot.pilot_params})
+    state = hass.states.get(entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes[ATTR_BRIGHTNESS] == 128
+
+    bulb.turn_on.reset_mock()
+    await hass.services.async_call(
+        LIGHT_DOMAIN,
+        SERVICE_TURN_ON,
+        {ATTR_ENTITY_ID: entity_id, ATTR_BRIGHTNESS: 255},
+        blocking=True,
+    )
+    pilot: PilotBuilder = bulb.turn_on.mock_calls[0][1][0]
+    assert pilot.pilot_params == {"dimming": 100, "state": True}