For an exact calculation of light intensity ratios it is necessary to know about the reflection ratios of the tarmacs. Until now light calculation programs such as DIALux use the theoretical values R1, R2, R3 and R4 according to CIE.
In order to consider the various tarmacs this method is not sufficient. Profound knowledge of the real reflection properties allows the optimization of the illumination system. Meanwhile luminaires with such low mounting heights are provided that conventional R-tables are not defined deeply enough. For such luminaires their own R-tables must be provided and considered for implementation in the different calculation programs as well.
R-tables which could be imported since DIALux version 4.6 are quite similar to the layout of the R-tables in EN 13201. You will be able to generate the specific file that should be imported with any text editor.
This file requires the ending „.RTB“. For every single information a new line will be used.
Definiton of R-table:
Limitation / Example
Should not be modified!
Name of the tarmac which is visualized in DIALux
„CIE R3“, ASCII, Unicode
Number of tan(έ)-values
nEps for the number of following values e.g. „29“
nEps-Values; one value per line
Number of β-values
nBeta for the number of following values e.g. „20“
nBeta-values; one value per line
R( tan(έ, β))
The file name in line 1 will be replaced by RTable.v1.
Name of the tarmac (e.g. CIE R3) which is visualized in DIALux. Number of tan(eps) (e.g. “29”) tan(eps_01) tan(eps_02)
Number of β-values (e.g. “20”) beta_01 beta_02
R( tan(eps_01, beta_01)
R( tan(eps_02, beta_01)
R( tan(eps_29, beta_01)
R( tan(eps_01, beta_02)
R( tan(eps_29, beta_20)
After importing the newly generated R-table it can be used for future projects.