New Photometric File - General Information

The General Information screen prompts you for lamp and power information, luminous dimensions of the luminaire and luminaire tilt information. Each section is described in detail below.

Lamp and Power

This section includes lamp data, candela multiplier factors, input watts and ballast factor information.

Number of Lamps - Enter the number of lamps included in the photometric file.

Lumens per Lamp - For relative photometry, enter the lumens per lamp in this text box. For absolute photometry enter a negative one (-1). For multiple source types in one luminaire, if the lamp lumens are of differing values, enter 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 - Enter 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).

Ballast Factor - Enter any ballast factor quoted in the photometric report.

Input Watts - Enter 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 - Use the pull-down menu to select an appropriate shape for the luminous portion of the tested luminaire.  Luminous dimensions are very important when using the IES file with many computation programs. Be accurate!

Units - Select the decimal units (Feet or Meters) that you will use to enter the luminaire's luminous dimensions.

Dimensions - Specify the appropriate dimensions in this area. 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 (ex: metal halide, base-up to base-down) then you should select the Include Luminaire Tilt Information checkbox. When this selection box is checked, the tilt angles and factors will be specified in the Lamp Tilt Information screen.

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 (using TILT=INCLUDE), to prevent this type of error.