Edit Photometric File - General Information
The General Information tab prompts you for lamp and power information, luminous dimensions of the luminaire and luminaire tilt information. Each section is described in detail below.
Photometric File Version (Version of the IES format)
This pull-down menu displays the Photometric File (IES format) Version associated with this photometric file. This version is specified as the header in the photometric file. Changing the version type will change some of the information available to you in this tool (e.g. Keywords, luminous shapes) and may require changes in these areas.
Lamp (light source) and Power
This section includes light source data, candela multiplier factors, input watts and ballast factor information.
Number of Lamps - Displays the number of lamps included in the photometric file.
Lumens per Lamp - For relative photometry, displays the lumens per lamp in this text box. For absolute photometry displays a negative one (-1). For multi-source files, if the lamp lumens are of differing values, displays the average lamp lumen value.
Note: Be aware that this number may not match the manufacturers rated lumens for the lamp. It is common practice to use a test lumen value of 1000 to facilitate the generic use of the report across several wattages. If unsure of the proper test lumens contact the manufacturer or testing facility.
Candela Multiplier - Displays any multiplying factor to be applied to all candela values in the file. This value is most often one. Generally, by the time a report has been published any multipliers are already bound into the file. If a file is being prorated, the multiplier is calculated using the ratio (New Lumens / Old Lumens). Note: Changing the multiplier in the Edit Tool will scale all of the candela values in accordance so that the original ratio is maintained (e.g. doubling the multiplier will half the candela values).
Ballast Factor - Displays any ballast factor quoted in the photometric report.
Input Watts - Displays the total input watts of the luminaire; lamp plus ballast.
Luminous Dimensions
This section describes the luminous shape of the luminaire, its physical dimensions and units type.
Luminous Type - The pull-down menu displays the specified shape for the luminous portion of the tested luminaire.
Units - Displays the decimal units (Feet or Meters) that are used to enter the luminaire's luminous dimensions.
Dimensions - Displays the appropriate dimensions for the luminaire. Depending on the shape selected, not all input cells are available (e.g., the Rectangle shape only requires Width and Length; Height = 0).
Lamp Tilt Information
This section is only modified if the map performance is affected by luminaire tilt. For most lamps, luminaire positioning does not affect lamp performance, so this selection box is not checked (i.e., Tilt=NONE).
If the lamp's output is affected when the luminaire is tilted, the tilt angles and factors are displayed here.
Lamp to Luminaire Geometry
This selection specifies the lamp position within the luminaire when the luminaire is face down.
Vertical Lamp Position - When the luminaire is aimed straight down the lamp is vertical; either base up or base down.
Horizontal along the 90 degree horizontal photometric plane - When the luminaire is aimed straight down the lamp is horizontal and remains in a horizontal position when the luminaire is tilted in the zero degree horizontal angle.
Horizontal along the 0 degree horizontal photometric plane - When the luminaire is aimed straight down, the lamp is horizontal. But when the luminaire is tilted in the zero degree horizontal angle the lamp tends toward a base-up or base-down position.
Number of Angles
Displays the number of angles included in the file.
Angle Listing
Displays the angles and correlated Tilt Multiplier in the provided table.
Note: Photometric Toolbox does not provide the option for specifying an external Tilt file. In most cases, external Tilt files are not shipped along side photometric files, or become lost, rendering the photometric data incomplete. As such, it is the industry trend to include all Tilt factors within the photometric file itself, to prevent this type of error.