The quality of LMT photometer heads represents the highest level of technology worldwide

• Si-photoelements of excellent quality and longtime stability
• classified and selected for specific applications
• illuminance and photocurrent absolutely proportional

• adapted to the spectral luminous efficiency V(λ) of the human eye (according to CIE, DIN)
• very fine V(λ)-approximation by partial filtering, error f'1 (CIE) resp. f'1 (DIN) ≤ 0.8 %
• fine V(λ)-approximation by full filtering, error f'1 (CIE) resp. f'1 (DIN) ≤ 2.5 %
• UV and IR response < 0.1 %

• photometer heads for perpendicular light incidence
• cosine correction for measurement of illuminance by light incidence from different directions, error f2 (CIE, DIN) £ 1.5 %
• adapters and photometer heads for measurement of cylindrical (Ez) or semi-cylindrical (Esc) illuminance

• without thermostatic stabilization α0 < 0.1 %/K
• with thermostatic stabilization α0 < 0.01 %/K

• measurement down to 0.00001 lx in combination with high precise LMT photocurrent amplifiers

• light sensitive surfaces 5, 10, 15, 30 mm Ø, and user specified diameters

• photometer heads in splash-proof housing and defroster for outdoor installation
• V'(λ) detectors for scotopic vision
• Esy (photosynthesis) detectors
• Ebi (bilirubin dissociation) detectors
• blue/red detectors
• photometer heads with photomultipliers

• individual test report for relative spectral responsivity
• individual test report for directional response
• specified errors acc. to DIN 5032 part 6 and 7 and CIE Publ. No. 69 (1987)
• LMT calibration certificate for illuminance respositivity, traceable to PTB calibrated standard, relative expanded measurement uncertainty incl. the uncertainty of the Standard employed 0.8%