LMK 5

luminance measuring video photometer
LMK Color - inside

The LMK 5 as the centerpiece of the whole LMK family, is equipped with a glas filter - specially calculated and manufactured for each CCD sensor. Each camera has its very own full filter, specially calculated and manufactured for this CCD matrix it is allowing a high-quality V(λ) adaptation for determining the luminances with the advantage of an image.

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:
[ 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

Metrological data

Metrological specifications
V(λ) [ f´1 < 3.5%1]
Measuring quantities
Luminance: L (cd/m²)
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 uncertainty2
fix focused lenses ∆L [ < 2% ]
focusable lenses ∆L [ < 2.5% ]
Repeatability3
∆L [ < 0.1% ]
Measuring accuracy
∆L [ < 3% (for standard illuminant A) ]
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 Calibration according to DIN 5032 Part 6 using a luminance standard led back from the Physical-Technical Federal Institute | 3 Measurement performed on a stabilized white LED light source L=100cd/m². Mean value over 100 Pixel; repeatability as variability of the mean value.