Daylight is a basic need
Natural daylight shapes the way we perceive, use, and experience spaces. It enhances the quality of the environment, promotes well-being, and makes interior spaces brighter, more inviting, and more functional. This is why the targeted provision of daylight is becoming increasingly important, especially in basements, interior areas, or so-called “enclosed” rooms.
Since the introduction of the European standard EN 17037, daylight has gained additional importance in architectural and lighting design. As a result, architects and designers are increasingly faced with the challenge of effectively integrating natural light sources into buildings—not only for aesthetic reasons, but also with regard to indoor environment quality, usability, energy efficiency, and cost-effective space optimization.
With itsDaylight Engineeringservice, Heliobus® supports specialist planners, architectural firms, building owners, and real estate developers in the planning and development of customized daylighting solutions. The goal is to direct natural light precisely where traditional window solutions are limited by structural constraints—such as basements, interior rooms, circulation areas, or complex building structures.
Heliobus® combines years of experience, extensive engineering expertise, and patented daylighting technologies. Our engineers and designers develop solutions that blend technical precision, architectural integration, and aesthetic appeal. The result is daylighting systems that enhance spaces, expand their potential uses, and make buildings more attractive in the long term.
You are in good hands with our daylight experts
Dr. sc. techn. Miroslav Fabian
CEO Heliobus AG
Mr. Fabian completed his PhD in daylighting in Kyoto and Bratislava. He worked on various research projects and planned the daylighting of large buildings in Germany and Austria. He was also involved in the development of the EU standard for indoor daylighting. Heliobus AG has been able to count on his expertise since 2017.
Rudolf Signer
Founder & CEO Heliobus AG
The energy and civil engineer recognized the need for room-optimizing daylight systems early on. In a pilot project in 1996, he implemented a daylight control system in a school building in St. Gallen for the first time - his initial experience in this fascinating and meaningful niche of engineering. In 1999, he pursued this path further and founded Heliobus AG.
Profile of Miroslav Fabian
Training
PhD Daylight
Kyoto University, Kyoto, Japan
Slovak University of Technology, Bratislava
Slovak Academy of Sciences, ICA SAS
Dipl. Civil Engineer
Slovak University of Technology, Bratislava
Research projects
Simulating daylight under the artificial sky
Visit the project website
APVV 0118-12
Research of quantitative and qualitative characteristics of daylight use in buildings
VEGA 2/0029/11
Modelling daylight for energy-efficient buildings
APVV SK-CZ-0015-09
Memberships
- Professional Member Solar Energy Society
- Member International Commission on Illumination CIE
- Member JTC 15 Lighting of Indoor Workplaces ,To revise ISO 8995-1:2002(E)/CIE S 008/E:2001 Lighting of Work Places
- Member TC -3-54 to revise and update publication CIE 16-1970: Daylight in the light of the advances in technology and design
- Member of Slovak Mirror Group Cooperation EN 17 037 Daylight in buildings
Daylight Engineering - selected projects
Museum of Concrete Art and Design
Ingolstadt, Germany
Impressions of the project
ERSTE Campus
Vienna, Austria
Website ERSTE Campus
Salk Hospital
Salzburg, Austria
Shopping Centre Alpenstrasse, SCA
Alpenstrasse, Salzburg, Austria
Impressions of the project
Publications
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Monthly luminous efficacy models and illuminance prediction using ground measured and satellite data Citations: Daylight luminous efficacy: An overview, Emmanuel I. Aghimien, Danny H.W. Li, Wenqiang Chen, Ernest K.W. Tsang, Solar Energy Vol 228, Pages 706-724 Potential daylight resources between tropical and temperate cities - a case study of Ho Chi Minh City and Moscow, Nguyen Phuong Khanh Thi Aleksei Solovyov, MATEC Web Conf. Volume 193, 2018 Experimental Evaluation of Solar Radiation and Solar Efficacy Models and Performance of Data-Driven Models Model Evaluation and Development for Global Luminous Efficacy Models through On-Site Measurement and Optimization Techniques Cong Thanh Do ; Hui Shen ; Ying-Chieh Chan, International building performance simulation association, 16th IBPSA conference, pp 1169-1176. Review of solar irradiance and daylight illuminance modeling and sky classification. LI, D. H. W. - LOU, S. W. In RENEWABLE ENERGY. ISSN 0960-1481, 2018, vol. 126, p. 445-453. The Simple Way to Upgrade the Daylight Standard for Tropical Vietnam, Phuong Thi Khanh NguyenAlexei K. Solovyov, Hoa Thi Nguyen, In Light Engineering.ISSN 0236-2945, 2020, vol.28, n.3,p.60-69 The Calculation Method for Light Climate Parameters Based on Sun-Lighting Efficiency and the Comparative Analysis of Light Climate in Hanoi and Moscow, Solovyov Alexei,, Hoa Thi Nguyen, In Light & Engineering 27 (5) pp 67-71. A new diffuse luminous efficacy model for daylight availability in Burgos, Spain, M.I. Dieste-VelascoDiez-MediavillaMontserrat Cristina Alonso-Tristán T. García-Calderón In RENEWABLE ENERGY. ISSN 0960-1481, 2020, vol. 146, p. 2812-2826.., Confirmed Method for Definition of Daylight Climate for Tropical Hanoi, In international scientific conference energy management of municipal facilities and sustainable energy technologies, emmft 2018, vol 1. issn 2194-5357, 2020, vol. 982, p. 35-47. |
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Annual daylight condition in Bratislava Citations: García, M. de Blas, J. Torres, "Proposal and evaluation of typical illuminance year (TIY) generation procedures from illuminance or irradiance data for daylight assessment in the long term", Solar Energy, Vol. 205, p. 496, 2020. |
| Design of the size of glazing of vertical windows depending on local lighting conditions Kittler, Richard - Fabian, Miroslav - Darula, Stanislav Návrh veľkosti zasklenia vertikálnych okien v závislosti od lokálnych svetelných podmienok. Světlo : Časopis pro světelnou techniku a osvětlování Roč. 15, č. 4. pp. 56-58. ISSN 1212-0812. |
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Indoor Daylight Spectral Characteristics and Illuminance Levels Measurements in Deep Space Rooms and its Evaluation for Human Visual and Biological Response HARTMAN, Peter, Peter HANULIAK, Lucia MAŇKOVÁ, Miroslav FABIAN, Jozef HRAŠKA a Stanislav DARULA... In: Proceedings of the 21st International Conference LIGHT SVĚTLO 2015 [online]. Vysoké učení technické v Brně, Fakulta elektrotechniky a komunikačních technologií, 2015, pp. 223-226 [cit. 2021-12-15]. ISBN 978-80-214-5244-2. Dostupné z: doi:10.13164/conf.light.2015.223 Citations: Development of a Colour Quality Assessment Tool for indoor luminous environments affecting the circadian rhythm of occupants, I.T.KimA.S.ChoiM.K.Sung, Building and Environment, Volume 126, December 2017, Pages 252-265 Accuracy evaluation of a calculation tool based on the spectral colour property of indoor luminous environments |
| Statistical evaluation of outdoor daylight parameters Fabian, Miroslav Štatistické hodnotenie parametrov vonkajšej dennej osvetlenosti. In Advances in architectural, civil and environmental engineering [elektronický zdroj] : 22nd Annual PhD Student Conference. Bratislava SR, 15.11.2012. Bratislava: Nakladateľstvo STU, 2012, pp. 643-651. ISBN 978-80-227-3853-8. |
| Contribution to CIE standard skies determination Fabian, Miroslav - Darula, Stanislav Contribution to CIE standard skies determination. In ATF 2013 [elektronický zdroj] : 2nd Conference on Acoustics, Light and Thermal Physics in Architecture and Building Structures.Book of proceedings. Leuven, Belgium 2-3.5.2013. Leuven: Katholieke Universiteit Leuven, 2013, pp. 111-116. ISBN 978-90-8649-637-2. |
| Diffuse clearness index in relation to daylight standard conditions Fabian, Miroslav - Darula, Stanislav Diffuse clearness index in relation to daylight standard conditions. In LUX EUROPA Krakow 2013 : 12th European Lighting Conference. Krakow, Poland, September 17-19, 2013. Warszawa: Polski Komitet Oświetleniowy SEP, 2013, pp. 439-443. ISBN 978-83-910849-6-0. |
| Influence of new CEN criterion on the minimum illuminance values of the work plane relative to Slovak standard Fabian, Miroslav - Darula, Stanislav Influence of new CEN criterion on the minimum illuminance values of the work plane relative to Slovak standard. In enviBUILD Buildings and environment 2013 [elektronický zdroj] : Zborník z medzinárodnej vedeckej konferencie, 17. október 2013, Bratislava. 1. vyd. Bratislava: Nakladateľstvo STU, 2013, pp. 153-157. ISBN 978-80-227-4070-8. |
| Impact of the new CEN minimum illuminance criterion on the working plane size Fabian, Miroslav - Darula, Stanislav Impact of the new CEN minimum illuminance criterion on the working plane size. Advanced Materials Research Vol. 899 : EnviBuild Buildings and Environment 2013. Bratislava, Slovakia, 17.10.2013. p. 321-327. ISBN 1022-6680(P). |
| Monthly luminous efficacy and CIE/ISO standard general skies Fabian, Miroslav - Darula, Stanislav Monthly luminous efficacy and CIE/ISO standard general skies. In LUMEN V4 2014 [elektronický zdroj] : V. konferencia Vyšehradských krajín pre osvetlenie, Visegrád, Hungary, 8-10.10.2014. Budapest: MEE Világítástechnikai Társaság, 2014, pp. 361-367. ISBN 978-963-9299-21-4. |
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Occurrences of standard skies and luminuos turbidity factor in Bratislava Citations: Oleg Sergeychuk, Dmitriy Radomtsev, Implementation of CIE General Sky Model Approach in Ukraine and Effects on Room Illuminance Mode. International Journal of Smart Home Vol. 10, No. 1, (2016), pp. 57-70, ISSN: 1975-4094 IJSH Dmitriy Radomtsev ,Oleg Sergeychuk, "Employment Features of CIE S 011/E2003 (ISO 15469:2004) "CIE Standard General Sky" under Designing Systems of Room Daylighting," 2015 9th International Conference on Future Generation Communication and Networking (FGCN), 2015, pp. 49-54, doi: 10.1109/FGCN.2015.22. |
| Simple conversion method for determination of the global illuminance from satellite images Fabian, Miroslav - Darula, Stanislav Simple conversion method for determination of the global illuminance from satellite images. In Vol. 1041 : The 9th International enviBUILD 2014 Conference, Brno, ČR, 18-19.9.2014. pp. 377-380. |
Profile of Rudolf Signer
Training
Dipl. Civil Engineer
University of Applied Sciences St.Gallen
Dipl. Energie Ing.
University of Applied Sciences Northwestern Switzerland, Basel
Building Physics & Ecology
Zurich University of Applied Sciences, ZHAW
Daylight Engineering - selected projects
Light Art Potsdamerplatz, Berlin
Impressions of the project
Light Pipe on the Bosporus, Istanbul
Impressions of the project
Inspirations from projects
