Parameters of a Spectrum

Value (%)

For each wavelength, you must type a value corresponding to the part of this wavelength power in the total spectrum power.

If needed, you can Add or Delete a wavelength. You can add a point by double-clicking on the graph.

Note: You can add up to 32767 wavelengths. If you add too many wavelengths, the displayed spectrum will not be complete.

Warning: The power of the source is not defined here.

Warning: Beware when using spectral maps (illuminance, intensity and luminance) with narrow spectrum sources (laser, LED, etc.). The default detector wavelength sampling is 13 on a broadband spectrum (from 380 nm to 780 nm). When using narrow spectrum sources, the detector sampling might not be sufficient and might cause erroneous results. This under sampling is also possible when using broadband spectrum with particular peaks as an example the white LED with blue peak.

Be sure to modify the detector sampling (and/or range) to attain a sampling equivalent to the source spectrum sampling. The determination of the detector sampling and range must be taken carefully in Indirect simulation or simulation using fluorescence. This point is also important when a precise colorimetric analysis has to be done.

Absorption Coefficient

Absorption coefficient is used in User Material Editor.

Note: If needed, you can Add

or Delete

a wavelength. You can add a point by double-clicking on the graph.

Spectrum File Format

A spectrum file is saved in a text format. You can read it with any text editor.

Line 1

This is a header line. OPTIS - Spectrum file v1.0

Line 2

This is a comment line as the dye description.

Line 3

This line is the number N of wavelength. 3

N lines

Each line contains a wavelength and the corresponding spectral value. 330 0380 0.3600 1.7