IES Indoor Report Summary

The Summary tab provides the cover page for the IES Indoor Report. Two sections are shown in this tab: the IES file description and calculated characteristics for the photometric file.

Banner

You may append a custom banner to your report by clicking in this graphic box. Once in the Banner dialog, you may paste a banner image from the Windows clipboard (use Ctrl-V) or import a graphics image from anywhere on your computer or network. The graphic image must be in BMP, WMF or JPG format.

Luminaire Image

You may associate a luminaire image with this report by clicking in this graphic box. Once in the Luminaire Image dialog, you may paste a banner image from the Windows clipboard (use Ctrl-V) or import a graphics image from anywhere on your computer or network. The graphic image must be in BMP, WMF or JPG format.

Note: If the photometric file was obtained from the InstaBase, the luminaire image from the InstaBase is used.

Descriptive Information

This section extracts all descriptive information above the TILT=NONE line in the photometric file. The type of information displayed and completeness of the description is at the manufacturers discretion.

Photometric files using the IESNA 95 or 2002 format will have keywords at the beginning of each line. Keywords are bracketed words used in photometric files to label data. Any number of defined keywords may be used to describe a file.

The descriptive information displayed in this section is not editable here. You must open the photometric file with the Edit Tool to make any changes to its contents.

Photometric Characteristics

The photometric characteristics displayed in the Summary tab are calculated directly by Photometric Toolbox or extracted directly from the photometric file.

Lumens Per Lamp - The manufacturers rated lumen output per lamp. The value is not applicable for absolute photometry.

Total Lamp Lumens - Lumen Per Lamp * Number Of Lamps. This value is not applicable for absolute photometry.

Luminaire Lumens - Total Lumens exiting the luminaire (this is a calculated metric).

Total Luminaire Efficiency - The ratio of total zonal lumens to the rated lamp lumens.

Luminaire Efficacy Rating (LER) - A rating is a measure of a luminaire's energy efficiency. LER is a measure of the luminaire's rated lumen output divided by its input power. LER has only been validated for the following indoor distribution luminaires described by NEMA; fluorescent, commercial downlights and HID Industrial luminaires. The luminaire product category is not reported by PTB, only the LER value, as the product information is not extractable from the IES file.

LER = [luminaire efficiency (EFF) x total lumens (or luminaire lumens if absolute photometry) (TL) x ballast factor (BF)] divided by [luminaire watts input] ]

LER Notes:

• LER can not be calculated if watts=0 or ballast factor = 0
• When calculating LER for absolute photometry (lumens = -1) , Luminaire Lumens is used instead of Total Lumens
• LER will not be calculated properly for per IES files prorated to 1000 lumens (or other prorations) - it will be artificially low.

Total Luminaire Watts - The luminaire wattage extracted from the photometric file. This value is used to calculate the LER value. It may be modified by using the Edit tool.

Ballast Factor - The ballast factor extracted from the photometric file. This value is used to calculate the LER value. It may be modified by using the Edit tool.

CIE Type - The CIE classification of the light distribution refers to the amount of flux emitted in the upper and lower hemispheres as a percentage of the total.

Spacing Criteria - An interior luminaire characteristic derived from the distribution of the direct component on the workplane. A luminaire's Spacing Criteria are an estimation of the spacing-to- mounting-height ratio s needed for a luminaire to produce uniform illuminance on a workplane, given a uniform luminaire array.

When considering the Spacing Criteria results, one should use the lowest value reported for all three cases.

Spacing Criterion  (0-180) - The spacing criterion that is calculated for two luminaires along the 0-180 photometric plane.

Spacing Criterion  (90-270) - The spacing criterion that is calculated for two luminaires along the 90-270 photometric plane.

Spacing Criterion  (Diagonal) - The spacing criterion that is calculated for four luminaires at the mid point of the luminaire array. All four luminaires are oriented in the same direction, which allows consideration of asymmetric luminaire distributions.

Basic Luminous Shape - The basic luminous shape of the luminaire is based on the luminaire's luminous dimensions (width, length, height).

Click here to see the luminous shapes available in PTB

Luminous Length (0-180 Degree plane) - The distance across the luminous opening when measured in the 0-180 photometric plane.

Luminous Width (90-270 Degree plane) - The distance across the luminous opening when measured in the 90-270 photometric plane.

Luminous Height - The average height of the luminous opening.

Luminance Data

The luminance data shown indicates the average luminance of the luminaire at a specific angle. The Luminance values shown are equal to the candlepower at that angle divided by the effective projected area of the luminaire when viewed from that angle. Luminous data is provided in units of candelas per square meter.

The luminous dimensions of the luminaire provided in the photometric file, are used in the calculations.

Some notes about luminance data:

• Larger vertical angles produce higher luminance values because their projected area is smaller, increasing the apparent brightness of the source.
• When comparing similar photometric distributions with the same light output, smaller luminaires will appear more luminous.
• The largest luminance values do not usually always occur in the areas around the maximum candela values. Projected area is much more important in the luminance calculation (light intensity is squeezed into a smaller space, making the luminaire appear much brighter at these angles).