diff --git a/__init__.py b/__init__.py
index 7c3b156..ca71f2e 100644
--- a/__init__.py
+++ b/__init__.py
@@ -35,38 +35,33 @@ bslamp2_ns = xiaomi_ns.namespace("bslamp2")
 LightHAL = bslamp2_ns.class_("LightHAL", cg.Component)
 FrontPanelHAL = bslamp2_ns.class_("FrontPanelHAL", cg.Component, I2CDevice)
 
-def make_config_schema():
-    schema = cv.COMPONENT_SCHEMA.extend({
-        # RGBWW Light
-        cv.GenerateID(CONF_LIGHT_HAL_ID): cv.declare_id(LightHAL),
-        cv.GenerateID(CONF_RED_ID): cv.declare_id(LEDCOutput),
-        cv.Optional(CONF_RED, default="GPIO13"): pins.validate_gpio_pin,
-        cv.GenerateID(CONF_GREEN_ID): cv.declare_id(LEDCOutput),
-        cv.Optional(CONF_GREEN, default="GPIO14"): pins.validate_gpio_pin,
-        cv.GenerateID(CONF_BLUE_ID): cv.declare_id(LEDCOutput),
-        cv.Optional(CONF_BLUE, default="GPIO5"): pins.validate_gpio_pin,
-        cv.GenerateID(CONF_WHITE_ID): cv.declare_id(LEDCOutput),
-        cv.Optional(CONF_WHITE, default="GPIO12"): pins.validate_gpio_pin,
-        cv.GenerateID(CONF_MASTER1_ID): cv.declare_id(GPIOBinaryOutput),
-        cv.Optional(CONF_MASTER1, default="GPIO33"): pins.validate_gpio_pin,
-        cv.GenerateID(CONF_MASTER2_ID): cv.declare_id(GPIOBinaryOutput),
-        cv.Optional(CONF_MASTER2, default="GPIO4"): pins.validate_gpio_pin,
-
-        # Front panel I2C
-        cv.GenerateID(CONF_FRONT_PANEL_HAL_ID): cv.declare_id(FrontPanelHAL),
-        cv.GenerateID(CONF_FP_I2C_ID): cv.use_id(I2CComponent),
-        cv.Optional(CONF_SDA, default="GPIO21"): pins.validate_gpio_pin,
-        cv.Optional(CONF_SCL, default="GPIO19"): pins.validate_gpio_pin,
-        cv.Optional(CONF_ADDRESS, default="0x2C"): cv.i2c_address,
-        cv.Optional(CONF_TRIGGER_PIN, default="GPIO16"): cv.All(
-            pins.validate_gpio_pin,
-            pins.validate_has_interrupt
-        ),
-    })
-
-    return schema;
-
-CONFIG_SCHEMA = make_config_schema()
+CONFIG_SCHEMA = cv.COMPONENT_SCHEMA.extend({
+    # RGBWW Light
+    cv.GenerateID(CONF_LIGHT_HAL_ID): cv.declare_id(LightHAL),
+    cv.GenerateID(CONF_RED_ID): cv.declare_id(LEDCOutput),
+    cv.Optional(CONF_RED, default="GPIO13"): pins.validate_gpio_pin,
+    cv.GenerateID(CONF_GREEN_ID): cv.declare_id(LEDCOutput),
+    cv.Optional(CONF_GREEN, default="GPIO14"): pins.validate_gpio_pin,
+    cv.GenerateID(CONF_BLUE_ID): cv.declare_id(LEDCOutput),
+    cv.Optional(CONF_BLUE, default="GPIO5"): pins.validate_gpio_pin,
+    cv.GenerateID(CONF_WHITE_ID): cv.declare_id(LEDCOutput),
+    cv.Optional(CONF_WHITE, default="GPIO12"): pins.validate_gpio_pin,
+    cv.GenerateID(CONF_MASTER1_ID): cv.declare_id(GPIOBinaryOutput),
+    cv.Optional(CONF_MASTER1, default="GPIO33"): pins.validate_gpio_pin,
+    cv.GenerateID(CONF_MASTER2_ID): cv.declare_id(GPIOBinaryOutput),
+    cv.Optional(CONF_MASTER2, default="GPIO4"): pins.validate_gpio_pin,
+
+    # Front panel I2C
+    cv.GenerateID(CONF_FRONT_PANEL_HAL_ID): cv.declare_id(FrontPanelHAL),
+    cv.GenerateID(CONF_FP_I2C_ID): cv.use_id(I2CComponent),
+    cv.Optional(CONF_SDA, default="GPIO21"): pins.validate_gpio_pin,
+    cv.Optional(CONF_SCL, default="GPIO19"): pins.validate_gpio_pin,
+    cv.Optional(CONF_ADDRESS, default="0x2C"): cv.i2c_address,
+    cv.Optional(CONF_TRIGGER_PIN, default="GPIO16"): cv.All(
+        pins.validate_gpio_pin,
+        pins.validate_has_interrupt
+    ),
+})
 
 @coroutine
 def make_gpio(number, mode="OUTPUT"):
diff --git a/doc/configuration.md b/doc/configuration.md
index 8a8e855..40115c3 100644
--- a/doc/configuration.md
+++ b/doc/configuration.md
@@ -170,12 +170,12 @@ light:
 If you use duplicate preset names within a single group, then the last preset will override the
 earlier one(s).*
 
-A preset can define one of the following light types:
+A preset can define one of the following:
 
 * **RGB light**
-  * **red** (**Required**, percentage): the red component of the RGB value.
-  * **green** (**Required**, percentage): the green component of the RGB value.
-  * **blue** (**Required**, percentage): the blue component of the RGB value.
+  * **red** (**Optional**, percentage): the red component of the RGB value (default = 0%).
+  * **green** (**Optional**, percentage): the green component of the RGB value (default = 0%).
+  * **blue** (**Optional**, percentage): the blue component of the RGB value (default = 0%).
   * **brightness** (*Optional*, percentage): the brightness to use (default = current brightness).
   * **transition_length** (*Optional*, time): the transition length to use.
 * **White light**
@@ -184,6 +184,8 @@ A preset can define one of the following light types:
   * **transition_length** (*Optional*, time): the transition length to use.
 * **Light effect**
   * **effect** (**Required**, string): the name of a light effect to activate.
+* **Brightness change only**
+  * **brightness** (**Required**, percentage): the brightness to use.
 
 **Activating presets from automations**
 
diff --git a/light/__init__.py b/light/__init__.py
index 025113d..b550ca6 100644
--- a/light/__init__.py
+++ b/light/__init__.py
@@ -22,6 +22,9 @@ CONF_NEXT = "next"
 CONF_GROUP = "group"
 CONF_PRESET = "preset"
 
+MIRED_MIN = 153
+MIRED_MAX = 588
+
 XiaomiBslamp2LightState = bslamp2_ns.class_("XiaomiBslamp2LightState", light.LightState)
 XiaomiBslamp2LightOutput = bslamp2_ns.class_("XiaomiBslamp2LightOutput", light.LightOutput)
 PresetsContainer = bslamp2_ns.class_("PresetsContainer", cg.Component)
@@ -35,29 +38,46 @@ PRESETS_SCHEMA = cv.Schema({
     })
 })
 
-PRESET_SCHEMA_BASE = cv.Schema(
-    {
-        cv.GenerateID(CONF_ID): cv.use_id(XiaomiBslamp2LightState),
-        cv.GenerateID(CONF_PRESET_ID): cv.declare_id(Preset),
-    }
-)
+def validate_preset(conf):
+    has_rgb = CONF_RED in conf or CONF_GREEN in conf or CONF_BLUE in conf
+    has_white = CONF_COLOR_TEMPERATURE in conf
+    has_effect = CONF_EFFECT in conf
+
+    # Check mutual exclusivity of preset options.
+    if (has_rgb + has_white + has_effect) > 1:
+        raise cv.Invalid("Use only one of RGB light, white (color temperature) light or an effect")
 
-PRESET_SCHEMA = cv.Any(
-    PRESET_SCHEMA_BASE.extend({
-        cv.Required(CONF_EFFECT): cv.string
-    }),
-    PRESET_SCHEMA_BASE.extend({
-        cv.Required(CONF_COLOR_TEMPERATURE): cv.color_temperature,
-        cv.Optional(CONF_BRIGHTNESS): cv.percentage,
-        cv.Optional(CONF_TRANSITION_LENGTH): cv.positive_time_period_milliseconds,
-    }),
-    PRESET_SCHEMA_BASE.extend({
-        cv.Required(CONF_RED): cv.percentage,
-        cv.Required(CONF_GREEN): cv.percentage,
-        cv.Required(CONF_BLUE): cv.percentage,
-        cv.Optional(CONF_BRIGHTNESS): cv.percentage,
-        cv.Optional(CONF_TRANSITION_LENGTH): cv.positive_time_period_milliseconds,
-    }),
+    # Check the color temperature value range.
+    if has_white:
+        if conf[CONF_COLOR_TEMPERATURE] < MIRED_MIN or conf[CONF_COLOR_TEMPERATURE] > MIRED_MAX:
+            raise cv.Invalid(f"The color temperature must be in the range {MIRED_MIN} - {MIRED_MAX}")
+
+    # When defining an RGB color, it is allowed to omit RGB components that have value 0.
+    if has_rgb:
+        if CONF_RED not in conf:
+            conf[CONF_RED] = 0
+        if CONF_GREEN not in conf:
+            conf[CONF_GREEN] = 0
+        if CONF_BLUE not in conf:
+            conf[CONF_BLUE] = 0
+
+    return conf
+
+PRESET_SCHEMA = cv.All(
+    cv.Schema(
+        {
+            cv.GenerateID(CONF_ID): cv.use_id(XiaomiBslamp2LightState),
+            cv.GenerateID(CONF_PRESET_ID): cv.declare_id(Preset),
+            cv.Optional(CONF_EFFECT): cv.string,
+            cv.Optional(CONF_COLOR_TEMPERATURE): cv.color_temperature,
+            cv.Optional(CONF_RED): cv.percentage,
+            cv.Optional(CONF_GREEN): cv.percentage,
+            cv.Optional(CONF_BLUE): cv.percentage,
+            cv.Optional(CONF_BRIGHTNESS): cv.percentage,
+            cv.Optional(CONF_TRANSITION_LENGTH): cv.positive_time_period_milliseconds,
+        }
+    ),
+    validate_preset
 )
 
 CONFIG_SCHEMA = light.RGB_LIGHT_SCHEMA.extend(