The Illuminance Measurement cluster (0x0400) is a Matter cluster that Reports ambient light levels in lux, used by light sensors.. It defines 5 attributes and is mandatory for 2 device types.

Last updated 30 Jun 2026

Illuminance Measurement 0x0400

Application Cluster

Measurement

Introduced in: Matter 1.0

Devices: 26

Reports ambient light levels in lux, used by light sensors.

Spec History

This cluster's ClusterRevision across the Matter releases it has shipped in. Click a version to inspect the cluster as it existed in that release.

Matter 1.0 rev 3 Matter 1.1 rev 3 Matter 1.2 rev 3 Matter 1.3 rev 3 Matter 1.4 rev 3 Matter 1.5 rev 3 Matter master rev 3

Attributes 5

Code	Name	Type	Flags
0x0000	MeasuredValue 0x0000..0 · default 0x0000 · nullable	int16u
0x0001	MinMeasuredValue 0x0001..0xFFFD · nullable	int16u
0x0002	MaxMeasuredValue min 0x0002 · nullable	int16u
0x0003	Tolerance max 0x0800	int16u	Optional
0x0004	LightSensorType 0x00..0x01 · nullable	LightSensorTypeEnum	Optional