UV Irradiance Meter
Linshang | UV Irradiance Meters
How to Choose a UV Irradiance Meter: Wavelength, Probe, Irradiance and Dose
For routine checks across different light sources, consider the LS125 with the matching probe; for tight spaces in UV LED curing equipment, compare the LS126A; for 254 nm germicidal lamps, compare the split LS126C or all-in-one LS127C; for continuous monitoring through a PLC or computer, consider the LS129 module.
UVA, UVB and UVC require different measurement approaches. One probe does not measure every UV source. When choosing a model, confirm the source wavelength, whether it is a mercury lamp or LED, the measurement range, and whether cumulative dose is needed.
Choose by Light Source and Application
LS125 | Multi-probe Inspections
One meter can be paired with different probes to measure irradiance and cumulative dose for supported sources. UVA mercury lamps, UVA LEDs, UVB, 254 nm UVC mercury lamps, and UVC LEDs each require a suitable probe; the meter must be used with a probe.
LS126A | UV LEDs and Confined Spaces
Designed to measure irradiance and dose in UV LED curing and exposure equipment. The probe is 7.2 mm wide, has a 3 mm aperture, and a spectral response of 340–420 nm, making it worth considering for measurement points that standard probes cannot easily reach.
LS126C／LS127C | 254 nm Germicidal Lamps
LS126C Split Type lets you position the probe separately from the display unit; LS127C All-in-One integrates the probe and display. Both are primarily designed for 254 nm UVC germicidal mercury lamps; do not assume they suit every UVC LED or 222 nm source.
LS129 | Online Monitoring at the Equipment
Uses an RS485 interface and MODBUS protocol. Depending on the probe configuration, it can connect to a PLC, HMI, or computer to acquire UV irradiance and dose data. Before deployment, confirm the power supply, installation space, communications, and required adapters.
What Is the Difference Between UV Irradiance and Cumulative Dose?
Irradiance | μW/cm², mW/cm²
Shows the UV power received per unit area at the measurement point at a given moment. It is commonly used to compare lamp output, differences between measurement points, and lamp degradation.
Cumulative Dose | μJ/cm², mJ/cm²
Shows the UV energy received over a period of time and is calculated by accumulating irradiance over time. For curing processes, also confirm exposure time, line speed, and the instrument’s sampling capability.
For batch comparisons, keep the test distance, probe orientation, measurement point, and light-source conditions consistent. Confirm energy logging, data export, and communication features for the specific model and probe.
When Asking About UV Equipment, Please Provide These 4 Details
- The light-source model, central wavelength, and whether it is a mercury lamp, UV LED, or another source type.
- Whether you need irradiance, cumulative dose, or both, and the expected measurement range.
- Test distance, spot size, available probe clearance, and ambient temperature.
- Whether the use is handheld inspection, curing/aging tests, or online monitoring, plus data logging and communication requirements.
Fulcrum Technology provides local product-selection advice in Taiwan, helps arrange equipment demonstrations, and offers after-sales technical and repair support. Please confirm demonstration models, probe configurations, stock, lead times, and service details for the product model and your requirements.
The LS332 is a multifunction luminance meter with a spectrometer-based sensor for displays, backlight modules and lighting. It measures luminance, flicker frequency, correlated color temperature and color rendering index, while showing real-time spectral curves to help analyze light sources.
The Linshang LS335 is a touchscreen spectral illuminance meter with a separate controller and digital probe. It measures illuminance (lux), correlated color temperature (CCT), color rendering index (CRI), color tolerance, flicker frequency, spectral curves, and plant-light PPFD parameters. Use it to compare luminaires, production batches, measurement positions, and lighting environments for R&D and quality control. Confirm the suitable probe and configuration for the source, measurement distance, and required metrics.
The LS125 is a multi-probe UV irradiance meter with interchangeable probes for different light sources and inspection conditions. It measures irradiance and energy dose for UVA, UVB, UVC, UV LED, and blue-light applications. Typical uses include UV curing, UV LED point and area sources, UVC germicidal lamps, UV aging chambers, grow lights, reptile lamps, nondestructive testing lamps, and blue-light therapy lamps. Select a probe according to the wavelength band, source type, measurement distance and range, and quality-control requirements.
The LS126A is a UVA irradiance meter with a miniature probe for measuring UVA LED intensity and energy dose. Its compact sensor fits into confined spaces and equipment interiors where a standard probe may be difficult to position. Suitable applications include UV curing, exposure systems, IC lithography and UV LED spot sources. Select the measurement setup according to the source wavelength, working distance, aperture and test procedure.
The LS126C split-type UVC UV irradiance meter measures irradiance and energy from UVC germicidal lamps, 253.7 nm mercury lamps, disinfection equipment and sterilization chambers. Place the remote probe at the measurement point while keeping the meter outside the equipment, making it suitable for enclosures, equipment interiors and confined spaces. Confirm the wavelength, working distance, illuminated area, range and site safety or quality-control procedure when selecting a configuration.
The LS127C integrated UVC irradiance meter measures irradiance from UVC germicidal lamps. Its one-piece design includes a 1 m measuring hook for positioning the meter at the required location. Bluetooth supports remote viewing with a compatible app; actual range and compatibility depend on the environment, device and software. Confirm the source wavelength, measurement distance, illuminated area and range required by your procedure. Remote viewing does not replace UVC shielding, exposure controls or workplace safety procedures.
The LS129 UV irradiance meter module is a digital probe for integrating UV intensity and energy measurement into equipment, production lines and automation systems. Its detector and controller are separate, and it supports RS485 communication with the MODBUS protocol for connection to a PLC, PC or HMI. Applications include UV curing, UV LED source monitoring, UVC germicidal equipment and process monitoring. UVALED, UVA and UVC spectrum versions are available; confirm the source center wavelength, power range, installation space, power supply and communication requirements before selection.