Spectral Light Meters for Photometric and Colorimetric Measurements

Comprehensive range of spectroradiometers for the measurement of illuminance (lux), luminance (cd/m²), luminous flux (lumens), luminous intensity (cd) as well as the colorimetric characteristic values such as chromaticity coordinates (x,y,u',v') or color rendering index (CRI), etc.

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For color measurements the spectroradiometric measured spectral distribution is used to determine all parameters based on mathemetical derivations. For instance the XYZ color matching functions defined by the CIE 1931 standard colorimetric observer. Or the color matching functions defined by the CIE 1964 supplementary standard colorimetric observer. Please see our basic of light tutorial with extensive information about color measurements.

For precise spectroradiometric color measurements especially a accurate wavelength calibration and absolute radiometric calibration is needed. Further mathematical corrections like bandpass correction according to CIE214 increase the accuracy even further. Of course the fundamental meter should be designed in order to match the needs with e.g. spectral range and optical bandpass width.

Further application relevant parameters for color spectroradiometers/spectral color meters are e.g. mobile use, temperature correction or WiFi connection. For stationary use a selection of interfaces like USB or Ethernet and entrance optics like Integrating Sphere Based Spectroradiometer Systems or goniometer are needed.

Spectroradiometers for measuring illuminance (lux) and chromaticity metrics

Model	Wavelength range / nm	Optical Bandwidth	Entrance Optic	Measurement range	Remark
MSC15	360 - 830	10 nm optical bandwidth correction applied according to CIE 214	Diffuser window with 10mm diameter, cosine corrected field of view, f2 ≤ 3 %		Inexpensive spectral light meter for common measurement tasks in general lighting.
BTS256-EF	360 - 830	10 nm, mathematical optical bandwidth correction according to CIE 214 can be automatically applied	Diffuser window with 20mm diameter, cosine corrected field of view, f2 Error ≤ 3%	199,999 lx ≤ 5ms (white light) 100 lx ≤ 1s (white light)	Precise, low-scatter spectroradiometer with Bi-Tec sensor for PWM light and flicker measurements.
LIGHTmetric One	360 - 830				Spectral light meter with Bluetooth, App for iOS and Android
CSS-45	360 - 830	10 nm optical bandwidth correction applied according to CIE 214	Diffuser window with 10 mm diameter, cosine corrected field of view, f₂ ≤ 1.5 %		Spectroradiometer sensor with RS485 and USB interface. Internal electro-mechanical shutter
CSS-45 with CSS-D	360 - 830				CSS-45 with Display unit CSS-D
BTS256-LED-DA	360 - 830		Bayonet adapter with diffuser window. 20 mm diameter of the diffuser window. ± 30° cosine corrected field of view. 5 % cosine correction within the specified range.		Universal spectroradiometer with diffuser accessories from the BTS256-LED Plus Concept.
BTS2048-VL	280 -1050	2 nm	Diffusor, cosine corrected field of view (f2 ≤ 3 %)	10lx 2,5s 10 100lx 250ms 10 1000lx 25ms *10	Versatile High End Spectroradiometer
BTS2048-VL-TEC	280 -1050	2 nm	Diffusor, cosine corrected field of view (f2 ≤ 3 %)	10 lx 2,5 s 10 100 lx 250 ms 10 1000 lx 25 ms *10	BTS2048-VL including temperature control
BTS2048-UVVISNIR	200 - 900	2 nm	Diffusor, cosine corrected field of view (f2 ≤ 3 %)	10 lx 3 s 10 100 lx 300 ms 10 1000 lx 30 ms *10	Versatile High End spectroradiometer from UV to NIR
BTS2048-VL-F	280 -1050	2 nm	Light guide adapter F16-F		Fiber bundle input. Optional fiber and cosine diffusor accessories
BTS2048-VL-TEC-F	280 -1050	2 nm	Light guide adapter		CCD sensor with Peltier cooling for maximum integration times. Fiber input.

Integrating sphere based spectroradiometer systems for measuring luminous flux (lumens) and chromaticity metrics

Model	Integrating sphere	Source emission	Wavelength range / nm	Optical Bandwidth	Measurement range (*1)	Remark
BTS256-LED	50 mmØ	2-Pi (10 mmØ)	360 - 830	5 nm	10 mlm - 70000 lm	Handheld spectroradiometer with internal integrating sphere for luminous flux. Can be upgraded with accessories of the BTS256-LED Plus Concept universal spectroradiometer.
ISD-21-BTS256-LED	210 mmØ	2-Pi (63.5 mmØ)	360 - 830	5 nm	0.3 lm to 35000 lm	Universal spectroradiometer with 21 cm integrating sphere for luminous flux of 2Pi lamps from the BTS256-LED Plus Concept accessories range.
ISD-50-BTS256-LED	500 mmØ	2-Pi (127 mmØ)	360 - 830	5 nm	1.2 lm to 120,000 lm	Universal spectroradiometer with 50 cm integrating sphere for luminous flux of 2Pi lamps from the BTS256-LED Plus Concept accessories range.
ISD-50HF-BTS256-LED	500 mmØ	4-Pi or 2-Pi (127 mmØ)	360 - 830	5 nm	1.2 lm to 120,000 lm	Universal spectroradiometer with 50 cm opening integrating sphere for luminous flux of 4Pi and 2Pi lamps from the BTS256-LED Plus Concept accessories range.
ISD-100HF-BTS256-LED	1000 mmØ	4-Pi or 2-Pi (254 mmØ)	360 - 830	5 nm	4 lm to 400,000 lm	Universal spectroradiometer with 100 cm opening integrating sphere for luminous flux of 4Pi and 2Pi lamps from the BTS256-LED Plus Concept accessories range.
ISD-15-BTS2048-VL	150 mmØ	2-Pi (35 mmØ)	350 -1050	2 nm	2 lm to 16000 klm	Compact spectroradiometer for in-line LED binning. Integrating sphere with dust-proof measuring aperture.
ISD-25-BTS2048-VL	250 mmØ	2-Pi (76 mmØ)	350 -1050	2 nm	5.5 mlm - 43000 klm	Compact spectroradiometer system for luminous flux and light color with expandable measuring aperture plate on integrating sphere
ISD-100HF-BTS2048-VL	1000 mmØ	4-Pi or 2-Pi (254 mmØ)	350 -1050	2 nm	0.1 lm - 700000 klm	Multi-sided integrating sphere measuring system with 1m diameter for larger lamps in 2Pi and 4Pi measurement geometry
ISD-15 + CSS-45	150 mmØ	2-Pi (35 mmØ)	360 - 830	10 nm optical bandwidth correction applied according to CIE 214		Example configuration of the CSS45 spectroradiometer sensor with integrating sphere
BTS256-LED Plus Concept	50 mmØ + external	2-Pi / 4-Pi	360 - 830	5 nm	External sphere dependent	Handheld spectroradiometer with integrated integrating sphere for luminous flux. Can be upgraded to the universal spectroradiometer with the accessories of the BTS256-LED Plus Concept.
TPI21-TH	215 mmØ	2-Pi	350 -1050	2 nm	0.5 mlm - 200,000 lm	Automated LED test system, CIE S 025 / LM-79-08 compliant
TFCT25	250 mmØ	2-Pi	350 -1050	2 nm	0.05 mlm - 141 klm	Spectral transmission & luminous flux test system for lateral light-emitting light guides used in front and rear automotive lighting

(*1) Using BiTec Spectral & V(λ) Sensors

Spectroradiometers with entrance optics for the measurement of luminous intensity (cd) and CIE 127 averaged intensity. Compatible with or part of goniometer systems.

Model	Measurement Geometry	Wavelength range / nm	Measurement range V(λ) sensor	Measurement range - Spectral sensor	Remark
BTS256-LED-IB	Average Intensity CIE condition B	360 - 830	7.5 mcd - 100 Mcd		Averaged LED intensity CIE127 B adapter for versatile BTS256-LED
BTS2048-VL-CP-ILED-B-IS-1.0-HL	Average Intensity CIE condition B	350 - 1050	0.15 mcd - 420 kcd	15 mcd - 150000 kcd	For LED binning / LED test systems CIE 127 condition B (Averaged LED intensity)
GB-GD-360-RB40-2-BTS256-LED	Goniometer 2-Pi distance 100 - 2000mm	360 - 830	0.2cd - 250000 kcd (*1)	40cd - 4000 kcd (*1)	Goniometer for versatile BTS256-LED spectroradiometer
GB-GD-360-RB40-2-BTS2048-VL	Goniometer 2-Pi distance 100 - 2000mm	350 -1050	0.1 cd - 3E8 cd (*1)	6 cd - 1000 kcd (*1)	Goniometer for high speed spectroradiometer of BTS2048 series

^(*1)At 1m distance

Spectroradiometers with entrance optics for the measurement of luminance (cd/m²) and spectral power distribution

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