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Suomeksi

Indoor lighting and
energy-efficient lighting systems

Members:

Professor D.Sc. (Tech.) Liisa Halonen
Senior Researcher, D.Sc.(Tech.) Eino Tetri
Doctoral Candidate, M.Sc. Jaana Jahkonen

Research Areas:
  • Office Lighting Systems
  • Artificial Lighting and Daylighting Controls
  • Lighting and Productivity
  • Visual Performance
  • Characteristics of Lamps and Ballasts
  • Effect of Dimming and Cathode Heating on Lamp Life
  • Dimming According to Daylight
  • Energy Efficient Electric Lighting for Buildings
  • Usage and Control of LEDs in General Lighting
Facilities:
Research Projects:
Publications:
  • Islam M., Bhusal P., Tetri E., Halonen L., Benefits of usage of energy efficient lamps in developing countries: Case study Bangladesh, Proceedings of CIE 2010 "Lighting Quality and Energy Efficiency", 14-17 March, 2010, Vienna, Austria, p.385-395.
  • Pinho, P., Rosvall, T., Tetri, E., Eloholma, M., Halonen, L., Light emitting diodes in plant growth: Comparative growth test in greenhouse and evaluation of photosynthetic radiation. Report 48, Helsinki University of Technology, Department of Electronics – Lighting Unit, Espoo 2008.
  • Bhusal P., Tetri E., Halonen L. Lighting and Energy in Buildings.Report 47. Helsinki University of Technology, Lighting Unit 2008. 23p
  • Pinho, P., Nyrhilä, R., Särkkä, L., Tahvonen, R., Tetri, E., Halonen, L., Evaluation of Lettuce Growth under Multi-spectral-component Supplemental Solid State Lighting in Greenhouse Environment. International Review of Electrical Engineering (I.R.E.E.), 2007, vol. 2(6), pp. 854-860.
  • Tetri, E., Halonen L. Future trends of energy efficient lighting. Proceedings of the 26th session of the CIE, Beijing, China, 4-11 July 2007. pp. 45-48.
  • Tetri E., Halonen L. LED Illumination - from science to future practice. Proceedings of Clima 2007 Wellbeing indoors, Helsinki, Finland, 10-14 June 2007. p. 6.
  • Halonen L., Tetri E. Lighting - Energy Consuption and Energy Efficiency. Proceedings of the 4th International conference Iluminat, Cluj-Napoca, Romania, 31 May - 1 June 2007.
  • Gligor V., Tetri E., Halonen L. User Preferences for Solid State Lighting. Proceedings of the 11th International Symposium on the Science and Technology of Lighting Sources, Shanghai, China, 20-24 May 2007. pp. 157-158.
  • Tetri E., Halonen L. Energy Performance and User Preferences for LED Lighting for Offices and Residential Buildings. Proceedings of DG-JRC Workshop "Status, Prospects and Strategies for LEDs in General Lighting", Ispra, Italy, 3-4 May 2007. p. 38.
  • Tetri E., Halonen L. IEA Annex 45 - Energy Efficient Electric Lighting for Buildings. Svetotehnika 1-2006, pp 66-67.
  • Halonen L., Tetri E. 2006. IEA ECBCS Annex 45 - Energy efficient electric lighting for buildings. Lighting of work places: proceedings. Fifteenth International Symposium Lighting Engineering 2006, Bled, Slovenia. Lighting Engineering Society of Slovenia. pp. 5-10.
  • Bhusal P., Tetri E., Halonen L. Quality and Efficiency of office lighting. Proceedings of the 4th European Conference on Energy Performance and Indoor Climate in Building and the 27th International Conference AIVC, Lyon, France, 20-22 November 2006, pp. 535-540. (International publication)
  • Bhusal P., Tetri E., Halonen L. Energy Efficient and Photometric Aspects in Renovation of Auditorium. Proceedings of the 4th European Conference on Energy Performance and Indoor Climate in Building and the 27th International Conference AIVC, Lyon, France, 20-22 November 2006, pp. 867-872. (International publication)
  • Pinho, P.; Tetri, E.; Halonen, L., Synergies of controller-based LED drivers and quality solid-state lighting. 2nd Conference on Ph.D. Research in MicroElectronics and Electronics (PRIME 2006), Otranto (Lecce), Italy, June 12-15, 2006, pp. 405-408.(International publication)
  • Bhusal P. Accuracy of the lighting energy calculation method. Light & Engineering, Vol. 14, No. 1, pp. 39-47, 2006. (International publication)
  • Moisio, O., Pajula, M., Pinho, P., Tetri, E., Halonen, L., Sepponen, R., Use of junction temperature in control of CCT in LED luminaire. CIE Midterm Meeting and International Lighting Congress, Congreso Internacional de Iluminación - El alumbrado en el siglo XXI, Léon, Spain, May 12-21, 2005. (International publication)
  • Pinho, P., Tetri, E., Halonen, L., Design and performance assessments of solid state light sources for plant growth. Lux Europa 2005 Lighting for humans - The 10th European Lighting Conference, Berlin, Germany, September 19-21, 2005, Deutsche Lichttechnische Gesellschaft e.V. , pp. 297-301. (International publication)
  • Bhusal P., Tetri E., Halonen L. Accuracy of the lighting energy calculation method. The 6 th international conference on energy efficient lighting, Shanghai, China, May 9-11, 2005. (International publication)
  • Pinho, P., Moisio, O., Tetri, E., Halonen, L. Photobiological aspects of crop plants grown under light emitting diodes. CIE Expert Symposium on LED Light Sources, Tokyo, Japan, June 7-8, 2004, CIE Central Bureau, pp. 71-74. (International publication)
  • Tetri E. Measurement Methods of T5-fluorescent lamps. Bucharest 2004 International Lighting Symposium Proceedings. International Lighting Symposium Quality Solutions for an Efficient Lighting. Bukarest, Romania, 30.9.-2.10.2004. pp. 86-91. (International publication)
  • Halonen L. IEA Annex 45; Energy efficient electric lighting for buildings. Daylighting; Research and Design in Architecture. Torino, 21.9.2004. (International publication)
  • Tetri E. Valaistuksen energian käyttö. Sähkö&Tele, 8/2004, pp. 18-19. (National publication)
  • Moisio O., Pinho P., Tetri E. & Halonen L. Controlling Colour Temperature of LED-luminaire. 10th International Symposium on the Science and Technology of Light Sources. Toulouse, France, 18.-22.7.2004. pp. 375-376. (International publication)
  • Tetri E. Lamp Life of T5 Fluorescent Lamps in Dimming Use. 10th International Symposium on the Science and Technology of Light Sources. Toulouse, France, 18.-22.7.2004. pp. 163-164. (International publication)
  • Moisio O. & Orreveteläinen P. LEDit tulevat. Sähkö&Tele, 8/2003, vol. 76. pp. 16-19. (National publication)
  • Tetri E. Light years. IEEE Industry applications magazine. Vol. 9. No. 1. 2003. p. 12-17 (International publication)
  • Tetri, E. & Gligor, V. Dimming according to daylight - effect on lamp life. Right Light 5. Proceedings of the 5th European Conference on Energy-Efficient Lighting. Nice, France 29-31 May 2002. p. 421-424. (International publication)
  • Tetri, E. Daylight linked dimming: effect on fluorescent lamp performance. Lighting Research and Technology. Vol. 34. Nr. 1/2002. pp. 3-10. (International publication)
  • Tetri E. Effect of dimming and cathode heating on lamp life of fluorescent lamps. Ingineria Iluminatului. 8/2002. pp. 87-90. (International publication)
  • Tetri E. 2001. Effect of dimming and cathode heating on lamp life of fluorescent lamps. Helsinki. Helsinki University of Technology, Lighting Laboratory. Report 28. 112 pp. (Doctoral thesis)
  • Tetri E. Effect of dimming and cathode heating on lamp life of fluorescent lamps. Doctoral thesis, report 28, Helsinki University of Technology, Lighting Laboratory 2001. 120 p. (Report)
  • Tetri, E. Lamp life test. Report 27. Helsinki University of Technology, Lighting Laboratory 2001. 34 p. (Report)
  • Tetri E. Effect of cathode heating on lamp life in dimming use. IEEE Industry Applications Society, 36th Annual Meeting, Chicago, USA, 30.9.-4.10.2001. 6 p. (International publication)
  • Tetri E. Effect of dimming on lamp life - Results of a lamp life test. Ingineria Iluminatului. 7/2001, Cluj-Napoca, Romania. pp. 74-78. (International publication)
  • Tetri E. Effect of dimming on lamp life - Results of a lamp life test. Iluminat 2001, Cluj-Napoca, Romania 28.6.-30.6.2001. 6 p. (International publication)
  • Tetri, E. Valonsäädön ja katodin hehkutuksen vaikutus loistelampun polttoikään. Valo 2/2001. ss. 34-36. (National publication)
  • Tetri, E. Säädön vaikutus loistelamppujen polttoikään. Sähkö-Tele 8/2001. pp. 12-15. (National publication)
  • Lehtovaara, J. & Tetri, E. Energy savings throug daylight. Ingineria Iluminatului, 2000. Nr. 4, pp. 54-58. (International publication)
  • Tetri, E. Continuous Dimming of Fluorescent Lamps - Results of a Lamp Life Test. NB 2000, Nordisk Belysningskongress 2000. Suomen Valoteknillinen Seura. Helsinki, Finland. 13.-15.9.2000. 6 p. (National publication)
  • Tetri, E. Light source projects in HUT. Ingineria Iluminatului, 1999, Nr. 2, pp. 44-53. (International publication)
  • Tetri, E. Effect of dimming on lamp life of fluorescent lamps. 24th Session of the CIE. Varsova, Poland. June 24-30, 1999. pp. 336-340. (International publication)
  • Lehtovaara, J. & Tetri, E. Päivänvalon hyödyntäminen kannattavaa Suomessakin. Sähkö&Tele, 1999. Vol. 72, nr. 8, pp. 18-20. (National publication)
  • Tetri, E. Valon säädön vaikutus loistelamppujen polttoikään. Sähkö&Tele, 1999. Vol. 72, nr. 6. (National publication)
  • Tetri, E. Loistelamppujen polttoikäkoe - valonsäädön vaikutus. Uutta sisävalaistustekniikkaa. Suomen Valoteknillinen Seura r.y. Helsinki, 29.9.1999. 10 p. (National publication)
  • Tetri, E. Effect of third harmonic filter on photometric and electrical characteristics of a 400 W high pressure sodium lamps. Report 21.Otaniemi: Helsinki University of Technology, Lighting Laboratory, 1997. 8 p. (Report)
  • Tetri, E. Lamp life test. Integrated daylighting system based on smart controls for user satisfaction (IDAS). Otaniemi: Helsinki University of Technology, Lighting Laboratory, 1998. 41 p. (Report)
  • Tetri, E. Valonlähteet - ominaisuudet ja energiankäytön tehostaminen. Raportti 22. Teknillinen Korkeakoulu, Valaistuslaboratorio 1998. 78 p. (Report)
  • Tetri, E. & Halonen, L. The lives of compact fluorescent lamps. Lighting, 1998. Vol. 18, nr 1, pp 40-42. Sydney, Australia. (International publication)
  • Tetri, E. Tutkittua tietoa - ulkovalaistukseen tarkoitettujen lamppujen käyttöominaisuudet. Uutta tie- ja katuvalaistustekniikkaa. Suomen valoteknillinen seura r.y., Helsinki, 1998. 10 p. (National publication)
  • Tetri, E. Profitability of switching off fluorescent lamps: TAKE-A-BREAK. Right Light 4. 4th European Conference on Energy-Efficient Lighting. Copenhagen, Denmark. November 19-21, 1997. (International publication)
  • Tetri, E. & Halonen, L. Energy efficiency of household lamps and properties of compact fluorescent lamps. SANCI-CIE International Conference on Lighting in Developing Countries. Durban, South Africa. September 1-3, 1997. 4 p. (International publication)
  • Koerakentamisraportti 1: Halonen, L, & Tetri, E. Induktiolamppu valonlähteenä vaativissa kohteissa. (Report)
  • ST-käsikirja: Halonen, L, & Tetri, E. Hehku-, halogeeni- ja loistelamppujen valintaopas. (Report)
  • Tetri, E. Integroiva pallo. Sähkö&Tele, 1996. Vol. 69, nr 8, pp 25-26. (National publication)
  • Tetri, E. Valaistuksen kunnossapito on helppoa - lampun vaihto edessä vuonna 2018. Talotekniikka, 1996. Nro 1, s. 49-50. (National publication)
  • Tetri, E. Valaistustekniikan EU-projektit. Sähkö&Tele, 1996. Vol. 69, nr 8, pp 37-38. (National publication)
  • Tetri, E. Valotason aleneminen ja valonlähdevalinta. Teollisuus ja rakennusmaailma, 1996. Nr 4, p 2. (National publication)
  • Tetri, E., Halonen, L. & Härkönen, H. Loistelamppujen sammutuksen kannattavuus. Laskentaohjelmaan TAUKO liittyvä teksti. MOTIVA, 1996. 8 s. (National publication)
  • Hongisto V., Holopainen R., Kemppilä S., Korhonen P., Lahtinen M., Lehtovaara J., Niemelä R., Palonen J., Penttilä J., Nykyri E., Reijula K., Saari A., Seppänen O., Siitonen T., Takki T., Tissari T., Tuomainen M., Valkama E., Tuottava toimisto 2005, Loppuraportti, TKK LVI-tekniikan laboratorio, Raportti B77, Espoo 2004.
  • Viorel Gligor, The Luminous Environment and Office Productivity, Licentiate Thesis, Helsinki University of Tehcnology, 4 June, 2004, Otaniemi, Finland
  • Lehtovaara, Jorma, Halonen, Liisa, Productive Office 2005 - Experiments in Light Cube, IEA Task31 report 2004. 20p.
  • Lehtovaara, Jorma, Hyvärinen, Mikko, Penttilä, Jopi, Liisa, Oittinen, Pirkko, Tuottavan toimistotyön valaistus, Raportti 2. Espoo: 2004. 34 s.
  • Halonen, Liisa, Lehtovaara, Jorma, Epäsuora toimistovalaistus, mittauksia ja käyttäjien mielipiteitä. Espoo: 2003. 31 s.
  • Halonen, Liisa, Oittinen, Pirkko, Lehtovaara, Jorma, Gligor, Viorel, Penttilä, Jopi, Ståhl, Henri, Haataja, Jarkko, Tuottavan toimistotyön valaistus, Raportti 1. Espoo: 2003. 68 s.
  • Gligor V., Hyvärinen M., Halonen L., Lehtovaara J. Known and less known aspects of lighting in office work. Iluminat 2003. The 2nd International Lighting Conference , Cluj Napoca, Romania, 8-9 May 2003.
  • Gligor, V., Lehtovaara, J., Halonen, L. Innovative office building - lighting, productivity and energy. The 3rd European Conference on energy Performance & Indoor Climate in Buildings, The 23rd Conference of the Air Infiltration & Ventilation Centre, Lyon, France 23.26.10.2002, pp. 679-684.
  • Paiho S., Karjalainen S., Alanne K., Norvasuo M., Eriksson L., Pöyhönen S., Kaartinen J., Lehtovaara J., Rakennusten uudet säätö- ja energiajärjestelmät, VTT tiedotteita 2134, Espoo 2002
  • Halonen, L., Eloholma, M., Lehtovaara, J., Daylight glare and lighting control in office work. TKK, Valaistuslaboratorio, 1997.
  • Halonen, L., Eloholma, M., Lehtovaara, J., Lighting control and dimensioning in integrated daylight systems. TKK, Sähkölaitos- ja valaistustekniikan laboratorio, 1996.
  • Halonen, L., Eloholma, M., Lehtovaara, J., Päivänvalon hyödyntäminen ja yksilöllisen valontarpeen toteuttaminen sisävalaistuksessa. TKK, Sähkölaitos- ja valaistustekniikan laboratorio, 1995.
  • Halonen, L., Lehtovaara, J., Eloholma, M., Valaistuksen säätö- ja ohjausratkaisut. TKK, Sähkölaitos- ja valaistustekniikan laboratorio, 1995
  • Halonen, L., Lehtovaara, J., Need of individual control to improve daylight utilisation and user's satisfaction in integrated lighting systems. 23rd session of the CIE, New Delhi, India, 1.-8.11. 1995, ss. 200-203.
  • Halonen, L., Lehtovaara, J., Eloholma, M., Lighting objectives and demands of future buildings. TKK, Sähkölaitos- ja valaistustekniikan laboratorio, 1993.
  • Halonen, L., Lehtovaara, J., Eloholma, M., Tulevaisuuden rakennusten valaistusvaatimukset ja tavoitteet. TKK, Sähkölaitos- ja valaistustekniikan laboratorio, 1993.
  • Lehtovaara, J., Halonen, L., Eloholma, M., Toimistotilojen valontarve- ja päivänvalomittaukset. TKK, Sähkölaitos- ja valaistustekniikan laboratorio, 1992.
  • Halonen, L., Lehtovaara, J., Valaistustekniikka. Otatieto, Espoo, 1992.
  • Halonen, L., Lehtovaara, J., Näyttöpäätteet, työympäristö ja valaistus. Suomen sähköurakoitsijaliitto ry (1989) s. 157.
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