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Hehkulab

Light solutions for light metrology

About the company

Hehkulab is a Finnish, Helsinki-based engineering and consulting company with over thirty years of combined metrology experience [1-12].

Hehkulab helps companies and test laboratories to make more accurate light measurements, while increasing their time and cost efficiency. For the clients, this comes with minimal effort, investments, and changes to their existing processes.

Hehkulab is a member of Photonics Finland.

Contact us: contact@hehkulab.fi

Individually: firstname.lastname@hehkulab.fi

Follow: Hehkulab on LinkedIn

Contacts

Alexander Kokka
Managing director, D.Sc. (Tech.)

Formerly a research scientist at the Finnish National Metrology Institute for optical quantities.

Doctoral dissertation on Spatial and spectral corrections for integrating sphere photometry and radiometry.

Tomi Pulli
Technical director, D.Sc. (Tech.)

Former branch manager for photometry at the National Metrology Institute for optical quantities in Finland.

Doctoral dissertation on Improvements in spectroradiometric measurements and applications.

Timo Dönsberg
Head of Engineering, D.Sc. (Tech.)

Former deputy branch manager for radiometry at the National Metrology Institute for optical quantities in Finland.

Doctoral dissertation on Development and characterization of the predictable quantum efficient detector, and its applications in LED photometry.

Markus Grönholm
Head of Manufacturing

Serial entrepreneur with a focus on laboratory robotics.

  1. Tomi Pulli et al, "A method for optimizing the cosine response of solar UV diffusers" Journal of Geophysical Research: Atmospheres 118, 7897-7904 (2013)
  2. Timo Dönsberg et al, "A primary standard of optical power based on induced-junction silicon photodiodes operated at room temperature" Metrologia 51, 197-202 (2014)
  3. Timo Dönsberg et al, "New source and detector technology for the realization of photometric units" Metrologia 51, S276-S281 (2014)
  4. Timo Dönsberg et al, "Optical aperture area determination for accurate illuminance and luminous efficacy measurements of LED lamps" Optical Review 23, 510-521 (2014)
  5. Tomi Pulli et al, "Advantages of white LED lamps and new detector technology in photometry" Light: Science & Applications 4, e332 (2015)
  6. Tomi Pulli et al, "Nonlinearity characterization of array spectroradiometers for the solar UV measurements" Applied Optics 56, 3077-3086 (2017)
  7. Alexander Kokka et al, "Fisheye camera method for spatial non-uniformity corrections in luminous flux measurements with integrating spheres" Metrologia 54, 577-583 (2017)
  8. Timo Dönsberg et al, "Predictable quantum efficient detector based on n-type silicon photodiodes" Metrologia 54, 821-836 (2017)
  9. Alexander Kokka et al, "Development of white LED illuminants for colorimetry and recommendation of white LED reference spectrum for photometry" Metrologia 55, 526-534 (2018)
  10. Tomi Pulli et al, "Out-of-range stray light characterization of single-monochromator Brewer spectrophotometers" Atmosphere-Ocean 56, 1-11 (2018)
  11. Alexander Kokka et al, "Validation of the fisheye camera method for spatial non-uniformity corrections in luminous flux measurements with integrating spheres" Metrologia 56, 045002 (9pp) (2019)
  12. Alexander Kokka et al, "Flat-field calibration method for hyperspectral frame cameras" Metrologia 56, 055001 (8pp) (2019)