24th Session of the CIE, Varsova, Puola, 24.-30.6.1999. Esitys: Effect of dimming on lamp life of fluorescent lamps.

Lighting Round Table of the Lighting Engineering Center LEC, Cluj-Napoca, Romania, 20.5.99. Esitys: Lamp life tests.

Right Light 4. 4th European Conference on Energy-Efficient Lighting. Copenhagen, Denmark 19-21 November 1997. Esitys: Profitability of Switching off Fluorescent Lamps: TAKE-A-BREAK.

SANCI-CIE International Conference on Lighting in Developing Countries, September 1-3, 1997, Durban South Africa. Esitys: Energy efficiency of household lamps and properties of compact fluorescent lamps.

Nordisk Belysningskongress, Tukholma, Ruotsi. 1996. Esitys: High colour rendering and energy-efficient discharge lamps

CIE 23rd Session, New Delhi, Intia, 1995. Posteri: Induction lamp in renovation of architecturally valuable building

Osanotto 2nd European Conference on Energy-Efficient Lighting,1993, Arnhem, Alankomaat

Nordisk Belysningskongres, 1993, Helsingör, Tanska. Posteri: Usability of single-capped fluorescent lamps in indoor and outdoor lighting

Osanotto 1 st European Conference on Energy-Efficient Lighting, 1991, Tukholma, Ruotsi.

CIE 22nd Session, Melbourne, Australia, 1991. Esitys: Usability of discharge lamps in outdoor lighting and low temperatures