LMK 5 color

color measuring video photometer
LMK Color - inside

The LMK 5 color is equipped with a glas filter wheel for color and chromaticity measurements, adapted to the CIE color matching functions of the 2° standard observer (CIE 1931). Thus, luminances and color coordinates can be measured in a spatially resolved way.

In addition, the measuring system can also be equipped with glas filters for the scotopic luminance V´(λ), the circadian action function C(λ), an IR-filter (measurements in the NIR range of 780 - 1000 nm), a BLH (blue light hazard), or a clear glass filter.

Technical data

Sensor - CCD - imaging sensor matrix system
Standard resolution
1380 x 1030 Pixel
Sony-CCD [ ICX 285 AL (2/3"); 14 Bit digital, progressive scan ]
High resolution
2448 x 2050 Pixel
Sony-CCD [ ICX 655 AL (2/3"); 14 Bit digital, progressive scan ]
Measurement time:
starting with 1 sec. up to 15 sec. depending on luminance level, adjusted lens and exposure / integration time
Dynamic range:
Color High Dynamic measurement
[ 1:10000000 (~140 dB) ]
Data interface:
Gigabit Ethernet Interface(GigE®)
Spectral matching:
  • with full size glas filter matched to V(λ)-function for measuring luminances
  • arranged with full size glas X(λ)-, V(λ)- and Z(λ)-filter for measuring colour values
  • additionally full size glas C(λ)-, V´(λ)-, BLH (blue light hazard) and IR-filter are available

Metrological data

Metrological specifications
V(λ) [ f´1 < 3.5%1]; X(λ) [ f*1 < 4% ]
Z(λ) [ f*1 < 6% ]; V´(λ) [ f*1 < 6% ]
Measuring quantities
Luminance
L (cd/m²)
Chromaticity coordinates
x,y
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 µs...15 s
Accuracy rating depending on lens (aperture number = F), i. e.:
1ms ... appr. 7500 cd/m² & 3 s ... appr. 2.5 cd/m² (F = min.)
1ms ... appr. 60000 cd/m² & 3 s ... appr. 20 cd/m² (F = max.)
Calibration uncertainty3
fix focused lenses ∆L [ < 2% ]
focusable lenses ∆L [ < 2.5% ]
Repeatability4
∆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 (set of test colours)4 ]
Uniformity
∆L [ < 2% ]

Advantages

  • complex evaluation of luminous and illuminated scenes by means of the photograph of an image-resolved luminance distribution
  • simultaneous recording of a big number of connected measuring data 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 being used in calculation programs (z.B. EXCEL®, MatLAB®, LabVIEW®)

1 Measurements according to DIN 5032 Part 6/CIE Pub. 69 | 2 Dominant wavelength, saturation, correlated color temperature | 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=100cd/m². Mean value over 100 Pixel; repeatability as variability of the mean value.