diff --git a/SUPPORTED.md b/SUPPORTED.md
@@ -169,6 +169,7 @@ Some newer Kasa devices require authentication. These are marked with [^1] in th
   - Hardware: 1.0 (US) / Firmware: 1.0.8
 - **KL420L5**
   - Hardware: 1.0 (US) / Firmware: 1.0.2
+  - Hardware: 1.0 (US) / Firmware: 1.0.7
 - **KL430**
   - Hardware: 2.0 (UN) / Firmware: 1.0.8
   - Hardware: 1.0 (US) / Firmware: 1.0.10

diff --git a/kasa/iot/iotbulb.py b/kasa/iot/iotbulb.py
@@ -91,6 +91,7 @@ class TurnOnBehaviors(DataClassDictMixin):
     r"KL120\(EU\)": ColorTempRange(2700, 6500),
     r"KL120\(US\)": ColorTempRange(2700, 5000),
     r"KL400L5": ColorTempRange(2500, 9000),
+    r"KL420": ColorTempRange(2500, 9000),
     r"KL430": ColorTempRange(2500, 9000),
 }
 

diff --git a/tests/device_fixtures.py b/tests/device_fixtures.py
@@ -55,9 +55,13 @@
     "KL135",
     "KL430",
 }
-# KL400L5 firmware 1.0.5 and 1.0.8 fixtures report no variable color temperature
-# support, so match the supporting 1.0.11 fixture rather than the entire model.
-BULBS_IOT_VARIABLE_TEMP_FIXTURES = {"KL400L5(US)_1.0_1.0.11"}
+# KL400L5 firmware 1.0.5/1.0.8 and KL420L5 firmware 1.0.2 fixtures report no
+# variable color temperature support, so match the supporting fixtures rather
+# than the entire model.
+BULBS_IOT_VARIABLE_TEMP_FIXTURES = {
+    "KL400L5(US)_1.0_1.0.11",
+    "KL420L5(US)_1.0_1.0.7",
+}
 BULBS_IOT_COLOR = {"LB130", "KL125", "KL130", "KL135", *BULBS_IOT_LIGHT_STRIP}
 BULBS_IOT_DIMMABLE = {"KL50", "KL60", "LB100", "LB110", "KL110", "KL110B"}
 BULBS_IOT = (

diff --git a/tests/fixtureinfo.py b/tests/fixtureinfo.py
@@ -129,14 +129,9 @@ def _model_match(fixture_data: FixtureInfo, model_filter: set[str]):
         if isinstance(model_filter, str):
             model_filter = {model_filter}
         assert isinstance(model_filter, set), "model filter must be a set"
-        model_filter_list = [mf for mf in model_filter]
-        if (
-            len(model_filter_list) == 1
-            and (model := model_filter_list[0])
-            and len(model.split("_")) == 3
-        ):
-            # filter string includes hw and fw, return exact match
-            return fixture_data.name == f"{model}.json"
+        fixture_base = fixture_data.name.removesuffix(".json")
+        if fixture_base in model_filter or fixture_data.name in model_filter:
+            return True
         file_model_region = fixture_data.name.split("_")[0]
         file_model = file_model_region.split("(")[0]
         return file_model in model_filter

diff --git a/tests/fixtures/iot/KL420L5(US)_1.0_1.0.7.json b/tests/fixtures/iot/KL420L5(US)_1.0_1.0.7.json
@@ -0,0 +1,57 @@
+{
+    "smartlife.iot.common.emeter": {
+        "get_realtime": {
+            "err_code": 0,
+            "power_mw": 500,
+            "total_wh": 1192
+        }
+    },
+    "system": {
+        "get_sysinfo": {
+            "LEF": 1,
+            "active_mode": "none",
+            "alias": "#MASKED_NAME#",
+            "ctrl_protocols": {
+                "name": "Linkie",
+                "version": "1.0"
+            },
+            "description": "Kasa Smart Light Strip, Multicolor",
+            "dev_state": "normal",
+            "deviceId": "0000000000000000000000000000000000000000",
+            "disco_ver": "1.0",
+            "err_code": 0,
+            "hwId": "00000000000000000000000000000000",
+            "hw_ver": "1.0",
+            "is_color": 1,
+            "is_dimmable": 1,
+            "is_factory": false,
+            "is_variable_color_temp": 1,
+            "latitude_i": 0,
+            "length": 50,
+            "light_state": {
+                "brightness": 60,
+                "color_temp": 2700,
+                "hue": 0,
+                "mode": "normal",
+                "on_off": 1,
+                "saturation": 0
+            },
+            "lighting_effect_state": {
+                "brightness": 60,
+                "custom": 0,
+                "enable": 0,
+                "id": "CdLeIgiKcQrLKMINRPTMbylATulQewLD",
+                "name": "Aurora"
+            },
+            "longitude_i": 0,
+            "mic_mac": "00:00:00:00:00:00",
+            "mic_type": "IOT.SMARTBULB",
+            "model": "KL420L5(US)",
+            "oemId": "00000000000000000000000000000000",
+            "preferred_state": [],
+            "rssi": -19,
+            "status": "new",
+            "sw_ver": "1.0.7 Build 240809 Rel.170227"
+        }
+    }
+}