AMT558 Spectral Illuminance Meter | Split-Probe Light Meter

SPLIT-PROBE SPECTRAL ILLUMINANCE METER

AMT558 Spectral Illuminance Meter

The AMT558 is a portable, split-probe spectral illuminance meter for evaluating lighting performance across a wide range of applications. It measures illuminance, correlated color temperature (CCT), color rendering index (CRI), flicker, UV index, blue-light hazard, and environmental conditions.

As a CCT and CRI meter, it helps users assess the color characteristics of lamps and luminaires. A dedicated plant-lighting mode adds PPFD, spectral PPFD, YPFD, and chlorophyll measurements for horticultural lighting analysis. Its 3.5-inch color touchscreen and spectral curve display make results easy to review in the field, laboratory, or production environment.

Key Features

High Range	Illuminance measurement up to 1,000,000 lux
Spectral Data	400 to 700 nm at 10 nm intervals
Complete Metrics	Illuminance, CCT, CRI, SDCM, flicker, UV index, blue-light hazard, temperature, humidity
Plant Lighting	PPFD, blue/green/red PPFD, YPFD, chlorophyll A and B
Split Design	Digital probe for flexible positioning
Display	3.5-inch IPS color touchscreen, storage for up to 1,000 readings
Data Export	PC software for batch data export and analysis
Units	Selectable lux and foot-candle (fc)

Applications

Lighting laboratories and quality-control facilities; light meters for LED testing and luminaire manufacturing; offices, schools and indoor environments; greenhouses, indoor farms and plant-growth research; street and outdoor lighting projects.

Technical Specifications

Parameter	Range / Value	Resolution / Accuracy
Illuminance wavelength range	400–700 nm	Spectral interval 10 nm
Illuminance	0–1,000,000 lux	0.1 lux; ≤ ±(3% of reading + 2 lux)
Illuminance units	lux, fc	Selectable
CCT	1,000–100,000 K	±5%
CRI	0–100	±2
UV index	0.0–15.0	±10%
Flicker frequency	10–500 Hz	±5%
Temperature	−40 to 120 °C	±0.5 °C
Relative humidity	0–100% RH	±4% RH
PPFD	0–10,000 μmol/m²/s	≤ ±(5% of reading + 0.5 μmol/m²/s)
Blue, green, or red PPFD	0–5,000 μmol/m²/s each	≤ ±(10% of reading + 0.5 μmol/m²/s)
YPFD	0–10,000 μmol/m²/s	≤ ±(5% of reading + 0.5 μmol/m²/s)
Chlorophyll A	0–10,000 μW/cm²	≤ ±(10% of reading + 0.5 μW/cm²)
Chlorophyll B	0–10,000 μW/cm²	≤ ±(10% of reading + 0.5 μW/cm²)
Response time	< 0.7 s	—
Probe aperture	21 mm diameter	—
Display	480 × 320-pixel IPS color screen	3.5 inch
Data storage	1,000 readings	—
Battery	Rechargeable 3.7 V, 4,000 mAh lithium battery	Power input DC 5 V
Operating environment	0–40 °C;<85% RH	—
Dimensions	141 × 70.4 × 22 mm	Probe: 40 mm diameter × 20 mm thick
Weight	Approx. 277 g	—

Specifications are based on the selected probe configuration and may vary by model. Measurements are traceable to the supplied calibration base.