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Lighting Survey Fields

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  rev. 2011-07-28        

The fields on the lighting survey table are as follows:





Used to sort records by building zone for reporting and management.  Zone ID can be  filtered from the drop-down pick list of lighting zones previously defined on the General Facility Information form.


Lighting tasks are used by designers to determine light level requirements and allow you to compare existing light levels to IESNA standards that are defined by tasks


Room number or designation.

User Code

User codes are user-defined codes that are used to specify a common FLB combination. Enter a unique user code the first time a particular FLB combination appears. From that point on, each new record for the same FLB combination can be represented simply by the user code and a quantity. Note that operating schedules will be copied from the first record, so they may have to be altered at this point.


A place to put other important information not covered by the other fields.

Room Dimensions - Length

Length of room (in feet or metres, depending on the measurement system).

Room Dimensions - Width

Width of room.

Room Dimensions - Height

Height of room.

Lighting Schedule - Hours/Day

Hours per day, used to calculate annual operating hours.

Lighting Schedule - Days/Week

Days per week, used to calculate annual operating hours.

Lighting Schedule - Weeks/Year

Weeks per year for calculating annual operating hours.  Annual Operating Hours = Weeks/Year * Days/Week * Hours/Day.  Where there is partial use on weekends some adjustment to hours and days may have to be made to ensure that this calculation works out correctly.

Demand Factor

This is a value used by lighting scientists to indicate the probability that particular lights will be on when the monthly peak electrical demand is set.  A factor of 1 is the default, which means that there is 100% certainty that the light fixtures will be on during the demand peak.  Monthly demand peak occurs somewhere around 1pm or 2pm for most commercial buildings and around 6pm or 7pm for most residential buildings.  Fixtures located in areas with occupancy sensing might have a lower probability (say 0.5 or 50%) of contributing to the demand peak.  Outdoor security lights that come on only at night would have a 0% change of contributing to the demand peak.  ManagingEnergy uses the demand factor to calculate overall lighting electrical demand and to estimate demand savings from retrofits.

Fixture -Type

Fixture type, including the housing, lens, and reflector.  There are many codes, with the most common ones provided in the Appendix xxx of this User's Guide.

Fixture -Voltage

Electrical supply voltage

Fixture - Quantity

Number of fixtures


Ballast Type for all fluorescent and HID lighting technologies.  Select noballast for regular incandescent fixtures.  Note that transformers for LED and low-voltage halogen technologies are selected here even though they are not ballasts by strict definition.


Ballast Quantity per fixture.  This is not the total number of ballasts in this lighting record, but is the number of ballasts in each fixture.  Normally this number will be 1, but it may 2 or 3 for multi-tube fluorescent fixtures.  It may also be 0.5 for tandem fixtures where a single ballasts serves lamps in two fixtures.


Lamp Type.  Choose the lamp type and wattage from the pull-down pick list.

Lamp-Max Quantity/Fixture

Lamp Quantity per fixture.  This is the total number of lamps in each fixture, not the total number of lamps in this lighting record.

Lamp- Quantity/Fixture

Lamps Used per fixture.  This is the number of lamps actually energized in each fixture.  Normally it will be equal to Lamp-Max Quantity/Fixture, but could be less where many lamps have been intentionally disconnected or the lighting system is poorly maintained and a significant percentage of lamps are burned out.  Note that ManagingEnergy calculates ballast losses for all ballasts in a fixture, but calculates lamp consumption only for the number of lamps used.


There are six fields dealing with light levels and room dimensions.  Five of them are needed only where lighting redesign is part of the project.  There is significantly more work required for ceiling plan redesigns, so many ManagingEnergy projects restrict the lighting analysis to fixture technology upgrades (i.e. one for one fixture replacements or modifications, or perhaps simple one for two replacements).  For those projects, only the Task light level has to be collected and entered, to give the analyst information on whether the space is overlit or underlit.

Lighting Levels - Min Level

Minimum measured light level (in foot-candles or lux, depending on the measurement system being used).

Lighting Levels - Task Level

Light level measured at task height (on desk, table, drawing board, etc.).  This information should always be collected and entered.

Lighting Levels - Max Level

Maximum measured light level.


For a complete listing of background lighting data, go to Background Information for All Portfolios under the Admin menu on the toolbar.


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