Lux
CALIBRATION FACILITY
The MSIR INDIA Photometry and Radiometry Laboratory is housed within a custom-built light-tight darkroom coated with ultra-matte optical black paint (absorptivity > 99.2%). Using NIST-traceable tungsten-halogen luminous intensity standard lamps (CIE Illuminant A at 2856 K) and high-accuracy photometric detectors, we calibrate lux meters, luminance meters, and UV radiometers.
ILLUMINANCE RANGE
0.1 Lux to 150,000 Lux
Sub-Lux to Direct Sun
WAVELENGTH
380 nm to 780 nm
CIE V(λ) Curve
BEST UNCERTAINTY (CMC)
± 1.2 % of reading
Luminous Intensity
BENCH LENGTH
3-Meter Optical Bench
Inverse-Square Law
Photometric Inverse-Square & CIE Spectral Response Simulator
MEASURED TELEMETRY
500.2
EXPANDED UNCERTAINTY (k=2)
±1.2%
TRACEABILITY
NPL India
PARAMETER TUNING
Evaluated as per GUM (JCGM 100:2008) guidelines with complete Type A and Type B expanded uncertainty analysis.
Primary Reference Standards
Our lux capabilities are anchored by primary standards directly calibrated by NPL India and BIPM-recognized National Metrology Institutes.
NIST Traceable Luminous Intensity Standard Lamp
FEL 1,000W Tungsten-Halogen Standard Lamp
Operated at a precise constant direct current to reproduce the CIE Illuminant A standard distribution temperature of 2856 K.
Technical Highlights:
Lux Scope Matrix (CMC)
Calibration & Measurement Capabilities (CMC) accredited under ISO/IEC 17025:2017. Uncertainties expressed at an expanded confidence level of approx. 95.45% (k=2).
| Discipline / Measurand | Calibration Range | Test Condition | Expanded CMC (±) | Master Reference Standard | Test Standard / Method |
|---|---|---|---|---|---|
| Digital Lux Meters & Light Meters | 0.1 Lux to 150,000 Lux | CIE Standard Illuminant A on Optical Bench | ± 1.2 % to ± 2.5 % of reading | Standard Lamp + 3-Meter Optical Track | Inverse-square distance law metrology (CIE Publication 69) |
| UV Radiometers (UVA, UVB, UVC) | 1 µW/cm² to 50 mW/cm² | Narrowband UV Source (365 nm / 254 nm) | ± 2.8 % of reading | Calibrated Silicon UV Transfer Photodiode | Spectral irradiance comparison |
Instruments Serviced & Calibrated
We calibrate all major industrial, pharmaceutical, aerospace, and research-grade instrumentation.
Digital Lux & Foot-Candle Meters
Handheld & benchtop environmental light meters
Luminance Meters (Nit / cd/m²)
Display panel and emergency exit sign meters
UV Light Meters & Radiometers
NDT magnetic particle inspection & UV curing meters
LED Color & Spectrum Analyzers
CCT, CRI, and illuminance spectrophotometers
Climate & Environment
Designed for Zero Drift
Every measurement at MSIR INDIA is conducted under strictly monitored and auditable environmental controls adhering to ISO/IEC 17025:2017:
UNBROKEN CHAIN OF TRACEABILITY (ISO/IEC 17025)
BIPM SI Base Unit Candela (cd)
NPL India Photometry & Radiometry Standards
MSIR Master Standard Lamps & Optical Bench (NABL CC-2891)
Client Lux Meters, UV Radiometers, and Photometers
Book Lux Calibration
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INDICATIVE CALIBRATION FEE
₹ 3,000 + GST
Explore All 12 Metrology Laboratories
MSIR INDIA operates 12 specialized NABL-accredited metrology domains in Chennai.