The LMK 6 uses imaging Sony CMOS image sensors. Each LMK 6 is equipped with a glass filter matched to its CMOS sensor. This ensures a high-quality photometric adaptation to the V(λ)-function for the imaging measurement of luminance distributions. The LMK 6 video photometer is compact, lightweight and has several possibilities to integrate it into existing applications and processes.


luminance measuring video photometer
LMK Color - inside

The LMK 6 is the center piece of the entire LMK product family and optimized for its CMOS image sensor as it is equipped with a full color glass filter. Each camera has a unique filter glass made for it, which ensures a high-quality V(λ)-adaptation.
The LMK 6 is robust in construction, lightweight, and has compact dimensions. So, it can be used in almost every process for a wide range of lighting measurement tasks.
In conjunction with the supplied system and measuring software, LMK6 can be used in areas of application where imaging determination and evaluation of luminances is required.
A large selection of high-quality standard lenses and special imaging systems in combination with an interchangeable lens mount further increase the flexibility of the LMK 6. As a result, the LMK 6 is able to meet a wide range of requirements and combines a wide variety of measuring devices in one system.

Technical data

Sensor - imaging CMOS matrix system
Standard resolution (LMK 6-5)
2464 x 2056 Pixel
Sony-CMOS [ IMX 250 (2/3"); 12 Bit digital ]
High resolution (LMK 6-12)
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
High-Dynamic measure (exposure bracketing series)
[ 1:10000000 (~140 dB) ]
Data interface
Gigabit Ethernet Interface(GigE®)
Spectral matching
using V(λ)-function matched full glas filter for luminance measures

Metrological data

Metrological specification 1
V(λ) [ f´1 < 3 %]2
Measuring quantity
Luminance: L (cd/m²)
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 % ]
Measuring accuracy
∆L [ < 3 % (for standard illuminant A) ]
∆L [ < 2 % ]

Dimensions and weight

Housing dimensions without lenses
stable black anodized aluminum housing: 80 mm x 80 mm x 47 mm (HxWxD)
camera housing without lens: 600 g

available lenses: 120 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)
  • 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.