I would like to thank Dr. James Ball (Milan, MI) and Dr. William Gehrmann of Texas Christian University for reviewing this manuscript and for their valuable comments during its preparation. Dr. Pekka Mäenpää of Kuopio University reviewed the Finnish terminology of this article. Senior researcher Tapani Koskela of the Finnish Meteorological Institute gave valuable information to support measurements of the sun. Wide ranged advice given by Dr. Jarmo Perälä of the University of Helsinki was also of great help while writing this article.
This project was made possible by funding granted by the Herpetological Society of Finland. Rolf C. Hagen Inc. supported significantly the expensive measurements and also donated several units for measurements.
AD-Lux Oy, Faunatar Oy and Tampereen Akvaario- ja Lintuliike Oy kindly lent lamps for measurements. Anja Kairisalo donated the used Zoo Med ReptiSun unit.
I wish to express my heartfelt thanks to my wife Sini, whose patience and mental support have been of indispensable help during this project spanning over more than four years and during which I have often essentially neglected my family.