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Archiv 2011

Veröffentlicht: 24.07.2011 Share it on Facebook


Schildkröten im Fokus, Bergheim 8 (3) 2011: 13–16

Vorsicht beim Einsatz ultra-starker UV-Strahler.

Caution when using powerful UV lamps.

Horst Köhler, Friedberg


Abstract

Bidmon (2011) has described carapace damage on his three juvenile Astrochelys radiata tortoises after having exposed them to the light of a Reptile UV Zoologist Mega-Ray bulb for three weeks only, 9.5 hours daily from a distance of 95 cm. His immediate decision to replace this strong lamp by another make was the right thing to do. The „Mega-Ray“ is a very strong UVB mercury vapour lamp mostly used by zoos. At a distance of 95 cm from the lamp face, the UVB intensity directly beneath the lamp is approx. 250 µW/cm² (measured by a UVB meter type Solarmeter Model 6.2 UVB). However, the lamp (and also other mercury vapour lamps, for instance the Osram Ultra-Vitalux) has much higher proportions of its UVB output in the shorter UVB wavelengths, meaning that its photo-biological effect is far stronger than sunlight. A tortoise sitting directly below the „Mega-Ray“ actually will therefore get the equivalent of about 500 µW/cm² sunlight, which is more than I have measured in the sunlight during the equatorial summer at noontime! Even in the outer range of the visible 75 cm wide light beam, UVB irradiation equals the average daily UVB strength in the microhabitat of wild tortoises in Southern Europe. Considering this, the observations described by Bidmon are not surprising. One can only be warned to use the „Mega-Ray“ without controlling UVB by use of an UVB meter.

Key words

Reptilia: Reptilia: Testudines, Testudinidae, UV irradiation, infrared irradiation.

Author

Horst W. Köhler
Postfach 101926
86009 Augsburg
E-Mail: hwm-koehler@web.de

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