LMK 6 color

The LMK 6 color a color measuring camera uses Sony CMOS imaging array sensors. Each LMK 6 color is equipped with a color glass filter set adapted to its specific CMOS sensor. This ensures a high-quality adaptation to the CIE color sensitivity functions of the 2 ° standard observer (CIE 1931). Thus the LMK 6 color is valuable for the imaging measurement of luminance and color distributions. The LMK 6 color is compact, lightweight and has several possibilities to integrate it into existing applications and processes.

LMK 6 color

luminance measuring video photometer
LMK color

The LMK 6 color uses a color glass filter wheel to match the CIE color sensitivity functions of the 2 ° standard observer (CIE 1931). Each camera comes with an unique color filter wheel, which ensures a high quality of customization and focuses on the unique spectral CMOS sensitivity function. The LMK 6 color is critical for imaging color and chromaticity measurements in addtion to imaging luminance measures.

In addition the measuring system can be equipped with other full-glass filters. For example, the scotopic sensitivity V '(λ), the circadian response function C (λ), the spectral action function for melatonin suppression Smel, different NIR filters, a BLH filter (blue light hazard), or a glass filters are available.

The LMK 6 color is robust in construction, lightweight and has compact dimensions. This means that it can be used in almost every process for many different light and color measurement tasks.
In conjunction with the supplied system and measurement software, the LMK6 color can be used in areas of application where the imaging determination and evaluation of luminance and color distribution is required.

A large selection of high-quality standard lenses and special imaging systems in combination with an interchangeable lens mount further increases the flexibility of the LMK 6 color. As a result, the LMK 6 color is able to meet many requirements and combines a wide range of measuring devices in a single system.

Sensor - imaging CMOS matrix system
Standard resolution (LMK 6-5 color)
2464 x 2056 Pixel
Sony-CMOS [ IMX 250 (2/3"); 12 Bit digital ]
High resolution (LMK 6-12 color)
4112 x 3008 Pixel
Sony-CMOS [ IMX 253 (1,1"); 12 Bit digital ]
Measurement time
starting with 1 sec. up to 15 sec. depending on luminance level, adjusted lens and exposure/integration time
Dynamic range
[ 1:10000000 (~140 dB) ]
Data interface
Gigabit Ethernet Interface(GigE®)
Spectral matching
  • using V(λ)-function matched full glas filter for luminance measures
  • adapted with full glass filters to the X(λ)-, V(λ)- and Z(λ)-function to measure color values
  • further full glass filters for the functions C(λ)-, V'(λ)-, Smel and BLH (blue light hazard) as well as NIR filters are available

Metrological data

Metrological specifications 1
V(λ) [ f´1 < 3%]2; X(λ) [ f*1 < 5 % ]
Z(λ) [ f*1 < 6 % ]; V´(λ) [ f*1 < 6 % ]
Measuring quantities
Luminance: L (cd/m²)
Chromaticity coordinates
Supported colour spaces
RGB, XYZ, sRGB, EBU-RGB, User, Lxy,
Luv, Lu’v’, L*u*v*, C*h*s*uv, L*a*b*,
C*h*ab, HIS, HSV, HSL,WST2
Measuring range (integration time)
100 µsec. ...15 sec.
Measuring range depending on lens aperture value (F)
1 msec. ... appr. 7500 cd/m² & 3 sec. ... appr. 2.5 cd/m² (F = min.)
1 msec. ... appr. 60000 cd/m² & 3 sec. ... appr. 20 cd/m² (F = max.)
Measuring range for the preset f-number (F/4)
1 msec. ... ca. 10000 cd/m² & 3 sec. ... ca. 3.3 cd/m²
Calibration uncertainty3
fix focused lenses ∆L [ < 2 % ]
focusable lenses ∆L [ < 2.5 % ]
∆L [ < 0.1 % ]
∆x,y [ < 0.0001 ]
Measuring accuracy
∆L [ < 3 % (for standard illuminant A) ]
∆x,y [ < 0.0020 (for standard illuminant A) ]
∆x,y [ < 0.0100 (test color set)4 ]
∆L [ < 2 % ]

Dimensions and weight

Housing dimensions without lenses
Housing dimensions LMK 6-5 color
stable black anodized aluminum housing: 117 mm x 90 mm x 47 mm (HxWxD)
Housing dimensions LMK 6-12 color
stable black anodized aluminum housing: 140 mm x 110 mm x 47 mm (HxWxD)
Weight LMK 6-5 color
camera housing without lens: 800 g

available lenses: 120 g – 1500 g
Weight LMK 6-12 color
camera housing without lens: 1300 g

available lenses: 200 g – 1500 g


  • Complex evaluation of luminous and illuminated scenes by means of the photograph of an image-resolved luminance distribution
  • Simultaneous recording of a large number of connected measuring data for easy data analysis (at a glance)

Result data

  • Luminance distributions in measuring images L(x,y)
  • Color and chromaticity distributions in measuring images
  • Derived lighting-engineering parameters such as illuminance distribution E(x,y) and luminous intensity distribution I(x,y)
  • Statistical data for use in various calculation programs (z.B. EXCEL®, MatLAB®, LabVIEW®)
1 Changes may occur with special lenses | 2 Measurements according to DIN 5032 Part 6/CIE Pub. 69 | 3 Calibration according to DIN 5032 Part 6 using a luminance standard led back from the Physical-Technical Federal Institute | 4 Measurement performed on a stabilized white LED light source L=100 cd/m². Mean value over 100 × 100 Pixel; repeatability as variability of the mean value.