COB_reflectors.mspct {photobiologyLEDs}

LEDs with reflectors

Description

A collection of emission spectra of a light-emitting-diode when combined with different reflectors.

Usage

COB_reflectors.mspct

Format

A "source_mspct" object containing 4 "source_spct" objects.

In each of the member spectra, the variables are as follows:

• w.length (nm)

• s.e.irrad (W m-2 nm-1)

Details

The "COB_reflectors.mspct" object contains "source_spct" objects with spectral irradiance data with the same Optisolis COB LED from Nichia, and different reflectors from the Mirella-G2 series from LEDiL . Distance from LED to cosine diffuser was 159 mm. Spectra are not normalized. It needs to be taken into account than even in these cases measurements have not been done in an optical bench, so values of spectral irradiance are subject to errors due to possible misalignment.

The COB LED used is the chip-on-board (COB) Optisolis type NFCWL036B-V3-Rfcb0 from Nichia with CRI > 95. Nominal electrical power of 10.3 W at nominal current of 270 mA. Spectra are for the COB over-driven at 350 mA, which is possible with enough cooling, but not recommended.

The spectral data are not expressed at constant wavelength intervals. Not only the intervals vary in the raw data from the array spectrometer, but in addition function thin_wl has been applied to reduce the storage space needed. In brief the wavelength interval has been increased as much as possible in those regions of the spectrum that lack detailed features (such as linear slopes and wavelength regions with zero light emission).

Note

Please see the metadata in each spectrum. These metadata are stored as attributes of the individual source_spct objects and can accessed with functions comment, getWhatMeasured, getWhenMeasured, getHowMeasured, getInstrDesc and getInstrSettings. See also the comment attribute of the COB_reflectors.mspct object.

References

https://www.ledil.com/ https://www.nichia.co.jp/en/

Examples

library(photobiology)

names(COB_reflectors.mspct)

# calculate photon irradiances in umol m-2 s-2 and relative to no reflector
irrads <- q_irrad(COB_reflectors.mspct, scale.factor = 1e6)
irrads$Q_Total_rel <- irrads$Q_Total / min(irrads$Q_Total)
irrads