Image courtesy of SOHO/EIT consortium. SOHO is a project of international cooperation between ESA and NASA.

Updates

A new paper to study the correlation of D3 Yield Index and UVB-induced photoconversion of 7-DHC to its photoproducts has been published on the Bulletin of the Chicago Herpetological Society; Volume 43, Number 4, April 2008:

Lindgren, J., Gehrmann, W. H., Ferguson, G. W., Pinder, J. E., 2008. Measuring Effective Vitamin D3-Producing Ultraviolet B Radiation Using the Solartech 6.4 Handheld, Broadband Radiometer. Bulletin of the Chicago Herpetological Society, 43(4), 57-62.

Previously unreleased information is now available on total UV output of the lamps. Also the safe human exposure time limits, as defined by international standards, have been calculated.