LS335 Spectral Illuminance Meter
Color touchscreen with clear, intuitive interface
Measures Lux, CCT, CRI and PPFD
Spectral curve display for rapid identification of full-spectrum LED lights
Wide measuring range up to 1,000,000 lux
High precision, compliant with national metrology standards
LS335 is a split-type spectral illuminance meter with a 3.5-inch color touchscreen for easy operation. It measures illuminance, UV index, CCT, flicker, CRI, color tolerance, temperature, humidity, and blue light hazard across various lighting scenarios. The spectral curve display helps identify light source types and assess blue light risks.
It also features a Plant Lighting Mode for accurate measurement of PPFD, blue/green/red PPFD, YPFD, chlorophyll A/B, temperature, and humidity—offering reliable support for home gardening, greenhouses, plant factories, and agricultural research. It can help users achieve efficient, intelligent light management and improve both the growth rate and quality of plants.
Product application
LS335 Testing Library Lighting
LS335 Testing Lighting Fixtures
LS335 Testing Plant Growth Lights
LS335 Testing Street Lights
Parameter
| Parameter Name | Parameter Value |
|---|---|
| Illuminance Wavelength Range | 400nm ~ 700nm |
| Illuminance Wavelength Interval | 10nm |
| Illuminance Measurement Range | 0 ~ 1000000 Lux |
| Illuminance Resolution | 0.1 Lux |
| Illuminance Measurement Accuracy | ≤±(3%H + 2 Lux) (H is the standard value, calibrated with the CIE standard illuminant A ) |
| Illuminance Unit Options | Lux (default), FC |
| CCT Measurement Range | 1000 ~ 100000K |
| CCT Measurement Accuracy | ±5% (Calibrated with the CIE standard illuminant A) |
| CRI Measurement Range | 0 ~ 100 |
| CRI Measurement Accuracy | ±2 (Calibrated with the CIE standard illuminant A) |
| UV Index Measurement Range | 0.0 ~ 15.0 |
| UV Index Measurement Accuracy | ±10% |
| Flicker Frequency Measurement Range | 10 ~ 500 Hz |
| Flicker Frequency Measurement Accuracy | ±5% |
| Temperature Measurement Range | -40℃ ~ 120℃ |
| Temperature Measurement Accuracy | ±0.5℃ |
| Humidity Measurement Range | 0%RH ~100%RH |
| Humidity Measurement Accuracy | ±4%RH |
| PPFD measurement range | 0 – 10000 μmol/m²/s |
| PPFD measurement accuracy | ≤±(5%H+0.5 μmol/m²/s) |
| PPFD (Blue) measurement range | 0 – 5000 μmol/m²/s |
| PPFD (Blue) measurement accuracy | ≤±(10%H+0.5 μmol/m²/s) |
| PPFD (Green) measurement range | 0 – 5000 μmol/m²/s |
| PPFD (Green) measurement accuracy | ≤±(10%H+0.5 μmol /m²/s) |
| PPFD (Red) measurement range | 0 – 5000 μmol/m²/s |
| PPFD (Red) measurement accuracy | ≤±(10%H+0.5 μmol /m²/s) |
| YPFD measurement range | 0 – 10000 μmol/m²/s |
| YPFD measurement accuracy | ≤±(5%H+0.5 μmol /m²/s) |
| Chlorophyll-a measurement range | 0 – 10000μW/cm² |
| Chlorophyll-a measurement accuracy | ≤±(10%H+0.5μW/cm²) |
| Chlorophyll-b measurement range | 0 – 10000μW/cm² |
| Chlorophyll-b measurement accuracy | ≤±(10%H+0.5μW/cm²) |
| Response Time | <0.7 seconds |
| Test Aperture Diameter | Φ21mm |
| Size | 141mm*70.4mm*22mm (Probe:40mm diameter*20mm thickness) |
| Weight | About 277g (including batteries) |
| Display | 480*320 Dot Matrix IPS color screen |
| Power Supply | 2 AA Alkaline Batteries |
| Operating Environment | Temperature 0 ~ 40℃, Humidity <85%RH |
| Supply Voltage | DC5V |
| Operating Current | 133mA |
| Operating Power Consumption | 665mW |
Features
Large color touchscreen display
The instrument features a 3.5-inch IPS color screen with a capacitive touchscreen for direct, easy, and convenient operation.
Multi-parameter measurement to meet various needs
Measure Lux, spectrum, CCT, CRI, SDCM, flicker, blue light hazard, UV index, temperature, and humidity—offering a full assessment of light sources for diverse applications.
Spectral curve measurement
Provide spectral curve measurement to view light intensity every 10nm, quickly identifying full-spectrum LEDs and blue light protection.
Plant mode for PPFD measurement
It can precisely measure PPFD, blue/green/red spectral PPFD, YPFD, chlorophyll A/B, temperature, and humidity—offering comprehensive data to optimize plant lighting and boost plant quality and yield.
Advanced digital probe technology
The main unit and probe use a split design with advanced digital probe technology, enabling in-probe signal processing for reduced interference and high accuracy.
High-precision spectral sensor design
The spectral sensor calculates illuminance using the V(λ) function, ensuring its spectral response matches V(λ) for accurate measurements of various light colors.
Ultra-wide range for low and high light measurements
Measures up to 1,000,000 lux, accurately handling low and high light levels for versatile use.
Flicker measurement function
Measures flicker frequency and depth to quickly assess if lighting meets national standards, enhancing comfort and safety.
Correlated color temperature measurement
Measures CCT to evaluate if a light source’s color temperature meets requirements, aiding manufacturers in lamp development and lighting design.
CRI and SDCM measurement
A higher CRI means object colors under the light appear closer to natural daylight.
SDCM assesses color consistency; the smaller the value, the closer the light color is to the standard.
Display blue light hazard ratio
A higher ratio indicates a greater proportion of blue light, providing an objective assessment of the light source’s blue light hazard.
UV index measurement
Assess the potential harm of solar UV radiation to the skin, helping users take proper protection. Higher values indicate stronger radiation and greater skin damage risk.
High accuracy, metrology-verified
Measurement data is precise and reliable. Illuminance measurements meet national metrology institute standards, ensuring trusted results.
Real-Time data statistics
Display current Lux, maximum, minimum, and average values during measurement.
Professional PC software
The instrument comes with professional PC software, enabling batch data export for easy data management and analysis.
Instant measurement with fast response
AutoOff can prevent battery drain
Switchable between Lux and Fc
Qualifications and Standards
Standards for the product：
JJG 245-2005 Verification Regulation of Illuminance Meter
JJG 212-2003 Verification Regulation of Color Temperature Meters
GB 50034-2013 Standard for lighting design of buildings
GB 40070-2021 Hygienic requirements of study products for myopia prevention and control in children and adolescents
GB/T 5702-2019 Method for measuring the color rendering properties of light sources
GB/T 9473-2017 Performance requirements for table lamps for paper task
GB/T 18204.21-2000 Standard examination methods for public places
GB/T 20145-2006 Photobiological safety of lamps and lamp systems
GB/T 21005-2007 UV erythema reference action spectrum,standard erythema dose and UV index
QX/T 87-2008 UV index forecast
GBZ 39942-2021 Application of GB/T 20145 for the assessment of blue light hazard to light sources and luminaires
IEEE Std 1789-2015 “IEEE Recommended Practices for Modulating Current in High-Brightness LEDs for Mitigating Health Risks to Viewers”
GBZ 44064-2024 Technical report on LED artificial lighting environment for plant growth
GBT 44941-2024 Terminology for horticulture lighting
GBT 44473-2024 LED lamps, LED luminaires and LED modules for horticulture
Lighting-Performance specifications
Packing List
| No. | Description | Quantity | Unit |
| 1 | Spectral Illuminance Meter | 1 | pcs |
| 2 | User Manual | 1 | pcs |
| 3 | Calibration Report | 1 | pcs |
| 4 | USB cable | 1 | pcs |
Your product information request
Please let us know your requirements and we will be in contact with you shortly！