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Baines, F. M. (2009). Experimental use of Schott Borofloat 33 glass as a Fixture Cover with COMMERCIAL METAL HALIDE and HALOGEN LAMPS not designed for use with reptiles. 
Added by: Sarina (02 Mar 2009 23:31:56 UTC)   
Resource type: Report/Documentation
BibTeX citation key: Baines2009
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Categories: Englisch = English
Keywords: Glühlampe = Incandescent Lamp, Halogenmetalldampflampe = Metal Halide Lamp, Material = Material, Ultraviolett = Ultraviolet
Creators: Baines
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It is well known that ordinary metal halide lamps (used for shop floor and warehouse lighting, for example) emit ultraviolet (UV) light. The mercury vapour and other compounds in the arc tube emit UV at a whole range of wavelengths including UVC. For this reason, they are normally only used inside sealed glassfronted fixtures, with warnings to the effect that the lamp should not be used if the outer glass cover becomes cracked or damaged in any way. The outer plate glass is designed to block the harmful ultraviolet radiation, in particular UVC and UVB. If shielded in this way, metal halides with “daylight” spectra can be used to provide extremely good light sources for reptiles in captivity. However, reptiles also require longwavelength UVB to create vitamin D3 in the skin. If it were possible to design a glassfronted fixture which blocked hazardous UVC and shortwavelength UVB (below the wavelengths normally found in natural sunlight) then certain ordinary doubleended metal halide lamps might, in theory, be very suitable for providing true fullspectrum light (UVB (290 – 320nm), UVA (320 – 400nm) and visible light.
Added by: Sarina  
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