C_E RoadWare Terminology

C_E RoadWare uses the following terms and definitions. The information shown in between [ and ] describes the constraints in type and value for each input to C_E RoadWare.

Aiming

is part of the information in the locations file defining four angles measured in degrees that descrbe the directions associated with the photometric distribution for each luminaire.

Contour

is the form of output showing illuminance or luminance values as plan view plots of contour lines, labelled for different values. Contour plots are saved in .png format with the file name combining the .rwi filename with a _con tag (e.g. demo_con.png).

Count

is a factor for each luminaire [real, greater than 0.01 up to 1,000]. This value is part of the information in the locations file. The count value will be applied like an individual LLF or multiplier to scale luminaire output.

Desc.

is optional text descriptions for file, type or luminaire, or roadway in the different input files and repeated in the output files.

Distance

is the longitudinal distance for the grid of calculation points [real, greater than 0].

File Data

is the part of the RWI file with information concerning the file itself: the filename, units and optional description.

IES File

is the name of a file with photometric data in IES format specified in the types file. The selection is limited to those files already in the client directory. Use the MDI Files Utility Upload feature to copy a file into the client directory.

Key

the string designation assigned in a types file and referenced in a locations file, consisting of alphanumeric characters.

#Lanes

number of lanes in the travelled way [integer, greater than 0]. Each lane has equal width. (the number of points times the number of lanes may not exceed 320.)

LLF

the light loss factor (LLF) for the luminaires [real, greater than 0.01 up to 1.0]. This value should reflect the worst-case situation over the maintenance cycle. The LLF value is part of the information in the types file.

Locations File

is the text file in .rwl format that includes the count, key, location and any aiming information for each luminaire. The locations are specified in xyz coordinates that are assumed to have the same units as specified in the roadWare form. A list of available locations files is presented on the roadWare form every time the form is refreshed. Clicking on the Locations link on the roadWare form will open the Locations form to create or modify .rwl files.

Longitudinal

the direction along the the roadway, in the direction of travel, compare with transverse.

Luminaires

the equipment described by the photometric file, along with the type file characteristics including rated lumens and LLF, and located as defined in the locations file.

Output

is the results from the calculation, with choices for numerical or graphical information. The Values link opens a new window to display all output corresponding to the currently selected RWI File. At the top is the numerical summary reporting the inputs used and details of the results that correspond to the RP-8 criteria. Additional numerical results follow, including details on all the luminaires and values for illuminance, luminance and veiling luminance calculations corresponding to each of the calculation points. The Contour and Shaded links each open a window to display a plan view of the illuminance and luminance results graphically, showing only those luminaires immediately adjacent to the calculation grid.

#Points Along

number of calculation points along the roadway in one distance [integer, from 10 up]. This is the minimum number of points along each of the two longitudinal lines in each lane. There must be at least 10 points aand they must not be more than 5 meters apart (set automatically by C_E RoadWare). (the number of points times the number of lanes may not exceed 320.)

Road Class

refers to the roadway surface classification per RP-8 as one of four defined types [R1, R2, R3, R4]. R1 is considered representative of concrete surfaces while R3 is the typical for asphalt/blacktop, and considered the default.

Roadway

is the part of the RWI file that defines the grid of calculation points represnting the traveled way, comprised of a number of lanes of equal width extending a specified distance, with a horizontal surface described by a 'R' class. This does not include any shoulders, breakdown lanes or other paved areas outside the traveled way.

RWI File

contains all the information for the RWI file including the filename, units, names for the types file and locations file as well as specifications for the calculation grid and optional descriptions. Use the Open command button to access an existing RWI file.

Rated Lumens

the rated lumen value for the photometric file of the luminaire [real, 0 defaults to value in photometric file]. This value should relate to the initial rated lumens for the intended lamp and is part of the information in the types file.

Shaded

is the form of output showing illuminance or luminance values as plan view plots of colored dots, with different shades for different values. Shaded plots are saved in .png format with the file name combining the .rwi filename with a _sha tag (e.g. demo_sha.png).

Transverse

the direction across the roadway, perpendicular to the direction of travel, compare with longitudinal.

Types File

is the text file in .rwt format that includes the key and photometric file information along with the rated lumens and information for each luminaire. A list of available types files is presented on the roadWare form every time the form is refreshed. Clicking on the Types link on the roadWare form will open the Types form to create or modify .rwt files.

Units

the units used for all linear dimensions in the RWI file and the associated locations file: Feet or Meters [F or M].

Values

is the link to show numerical output from the calculation as a composite text file made from several .rw output files. The link opens a new window to display all output corresponding to the currently selected RWI File. To save the composite file to a local device, use the browser's File/SaveAs command. At the top is the numerical summary reporting the inputs used and details of the results that correspond to the RP-8 criteria. Additional numerical results follow, including details on all the luminaires and values for illuminance, luminance and veiling luminance calculations corresponding to each of the calculation points.

Width

the transverse dimension of one lane [real, greater than 0], where each lane has the same width.