qp_uvb313_temp.spct: Spectral irradiance of UVB lamps at different temperatures.

Description Usage Format Details Note References Examples


Dataset of spectral irradiance from a set of two Q-Panel UVB-313 40W fluorescent tubes, measured at different temperatures.




qp_uvb313_temp.spct is a "source_spct" object with 777 rows (290 nm to 400 nm, 1.0 nm step) and 3 variables.

The variables are as follows:

qp_uvb313_temp.mspct is a "source_mspct" object containing a collection of "source_spct" objects, each with 111 rows (290 nm to 400 nm, 1.0 nm step) and 2 variables.

The variables in the member spectra are as follows:


Absolute values are comparable among the different temperatures. The lamps and the cosine diffuser were located inside a Conviron growth chamber. The measurements were done with a recently calibrated Macam double-monochromator spectroradiometer located outside the chamber and maintained at constant room temperature of 22 C. After each change in the temperature controller set-point enough time was allowed after the temperature had stabilized inside the chamber, for the output of the lamps to also become stable.

qp_uvb313_temp.spct contains data for different temperatures in a "tidy" long form with a factor indicating the temperature at which the lamp was during measurement.

qp_uvb313_temp.mspct contains the same data as a collection of spectra stored in a "source_mspct" object, with member "source_spct" objects named minus5C, plus00C, plus05C, plus10C, plus20C, plus30C, and plus35C.


Instrument used: Macam SR-9010-PC scanning double monochromator spectroradiometer with a cosine corrected input optics. Recently calibrated. The lamps were driven by a high frequency electronic ballast.


Aphalo, P J, R Tegelberg, and R Julkunen-Tiitto. 1999. The Modulated UV-B Irradiation System at the University of Joensuu. Biotronics 28: 109–120. http://ci.nii.ac.jp/naid/110006175827/en.



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