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Photometrics

Point-by-Point Photometrics

The outdoor point-by-point photometric calculations were improved in a number of ways. They can now be used indoors for both general photometric calculations and for egress photometric calculations.

Reflections

Reflections from buildings and walls can be included in the calculation. Each wall has a reflectance value that is used to calculate the amount of light that it reflects. For outdoor photometrics, this reflection results in slightly higher values near buildings. For indoor photometrics, wall reflections are an important component of the calculation.

Reflections from the ceiling can also be included in the calcluation. Each area can have a ceiling height and reflectance specified. These values are set when an area is first inserted. They can be modified using the Query Photometric Boundary or Light-Obstructing Object command.

General vs. Egress Calculations

There are two types of point-by-point photmetric calculations available: general and egress. Each calculation uses separate fixtures, separate fixture lumens, and separate layers.

Separate Fixtures: Each calculation uses a separate set of light fixtures. Each light fixture on the drawing can be marked as being included in either the general lighting calcluation, egress lighting calculation, both calculations, or neither. This is important for egress calcluations, where only certain light fixtures will be on in an emergency situation.

Separate Fixture Lumens: In the light fixture schedule, the total lumens for the fixture can be set differently for the general calculation and egress calculation. This is important for egress calculations for fixtures where only certain lamps will be on in an emergency situation.

Separate Layers: Light fixtures included in the egress calculation can be inserted on a separate layer from other light fixtures. The separate layer allows you to create a view of the drawing with only the egress light fixtures included.

Multiple Areas

You can insert as many general calcluation and egress calculation areas as you want on the drawing. The general areas include the light from all general lights on the drawing. The egress areas include the light from all the egress lights on the drawing.

Schedule

A schedule for each area can be inserted on the drawing. The schedule can list the average footcandles (FC) in the area, maximum FC, minimum FC, minimum to maximum FC ratio, maximum to minimum FC ratio, and average to minimum FC ratio. You can customize the schedule to list only the values you are required to show.

 

Total Watts in Indoor Lighting Level Report

A new Total Watts column is included in the Indoor Lighting Levels schedule. It displays the total watts for each room in the project, plus the total watts for the entire project.

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