Spectral irradiance of white fluorescent tubes at different temperatures.

Dataset of spectral irradiance from a set of four Osram L 18W/840 Lumilux fluorescent tubes in an Aralab FitoClima 1200 growth chamber. The tubes are located in the temperature controlled space.

Usage

Osram_L_18W_840_temp.mspct

Format

Osram_L_18W_840_temp.mspct is a "source_mspct" object containing a collection of "source_spct" objects, each with 1775 rows (250 nm to 1050 nm, 0.42 to 0.48 nm step) and 2 variables.

The variables in the member spectra are as follows:

• w.length (nm)

• s.e.irrad (W m-2 nm-1)

Details

Absolute values are comparable among the different temperatures as the location of the entrance optics remained unchanged and dimming at 100 The lamps and the cosine diffuser were located inside the growth chamber. The Ocean Optics Maya 2000Pro array spectroradiometer as kept outside the chamber at a room temperature of approximately 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.

Instrument used: Ocean Optics Maya2000 Pro single-monochromator array spectroradiometer with a Bentham cosine corrected input optics. A complex set of corrections and calibration procedure used. The source_spct objects have attributes with additional information on the measurement and data processing. Measurements done by Pedro J. Aphalo. Data acquired and processed using R packages 'ooacquire' and 'photobiology'.

Examples

Osram_L_18W_840_temp.mspct[["20C"]]
#> Object: source_spct [1,775 x 2]
#> Wavelength range 250.41-1049.65 nm, step 0.42-0.48 nm 
#> Label: Median of 1 source_spct objects.
#>  Osram L 18W/840 Lumilux, used, dimming at 100% , t = 20C 
#> Measured on 2023-12-01 13:57:02.925125 UTC 
#> Variables:
#>  w.length: Wavelength [nm]
#>  s.e.irrad: Spectral energy irradiance [W m-2 nm-1] 
#> --
#> # A tibble: 1,775 × 2
#>    w.length s.e.irrad
#>       <dbl>     <dbl>
#>  1     250.  -0.00206
#>  2     251.  -0.00250
#>  3     251.  -0.00183
#>  4     252.  -0.00228
#>  5     252.  -0.00190
#>  6     253.  -0.00247
#>  7     253.  -0.00291
#>  8     254.  -0.00236
#>  9     254.  -0.00278
#> 10     255.  -0.00251
#> # ℹ 1,765 more rows