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PRESCRIPTIVE APPROACH...10/12/2015 SLIDE 116 PRESCRIPTIVE APPROACH 1,270.7 W Main Entry Lobby Main...

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PRESCRIPTIVE APPROACH 1. Actual and Allowed LPD 2. Complete Building Method 3. Area Category Method 4. Tailored Method This section contains exercises for lighting power adjustments, Complete Building Method, and Area Category Method. The exercises are designed to follow the forms and Certificates of Compliance for Nonresidential indoor Lighting.
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  • PRESCRIPTIVE APPROACH

    1. Actual and Allowed LPD

    2. Complete Building Method

    3. Area Category Method

    4. Tailored Method

    This section contains exercises for lighting power adjustments,

    Complete Building Method, and Area Category Method.

    The exercises are designed to follow the forms and Certificates

    of Compliance for Nonresidential indoor Lighting.

  • SECTION 7

    THE COMPLIANCE PROCESS

    There are two major steps to Title 24 compliance:

    1. Meet all mandatory requirements by installing required controls and

    devices and ensuring that they have all of the required functionality.

    2. Meet all prescriptive or performance requirements by ensuring that the

    actual lighting power installed in a space is less than the allowed lighting

    power for that space.

    SLIDE 91 10/12/2015 PRESCRIPTIVE APPROACH

  • SECTION 7

    ACTUAL LIGHTING POWER

    The actual indoor lighting power of the proposed

    building area is the total wattage of all planned,

    permanent and portable lighting systems,

    adjusted by the following:

    1. Reduction of wattage through controls beyond

    what the standards require

    2. Lighting wattage exclusions

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 92

  • SECTION 7

    ACTUAL LIGHTING POWER: REDUCTION THROUGH CONTROLS

    If you exceed the mandatory controls

    requirements by installing a control where

    it is not required, you are eligible for a

    Power Adjustment Factor (PAF). This

    will result in a lower calculated lighting

    power use for the installed system.

    ( Controlled W ) X ( PAF from 140.6-A )

    = Lighting Power Reduction

    For example, a 480 ft2 open office plan

    with an occupancy control is eligible for a

    PAF of 0.2. Given that the controlled

    lighting in that space totaled 100W :

    (100W) X (0.2) = 20W of excluded

    lighting power (80W total)

    SLIDE 93 10/12/2015 PRESCRIPTIVE APPROACH

  • SECTION 7

    ACTUAL LPD: LIGHTING WATTAGE EXCLUDED

    Wattage of many lighting applications may be excluded, including:

    • Studio lighting for film or photography and for a videoconferencing studio

    • Equipment that is for sale and for demonstration

    • Lighting installed by the manufacturer in vending machines, scientific and

    industrial equipment, refrigerated cases, walk-in freezers, and food

    preparation equipment

    SLIDE 94

    Photo: Jessie Whiteman

    10/12/2015 PRESCRIPTIVE APPROACH

  • SECTION 7

    ALLOWED LIGHTING POWER

    The allowed indoor lighting power for each building or area is

    calculated using one of the following methods:

    • Complete Building Method

    • Area Category

    • Tailored Method

    Each of these methods involves multiplying the square footage of a space by

    the allowed wattage per square foot for that space.

    SLIDE 95 10/12/2015 PRESCRIPTIVE APPROACH

  • SECTION 7

    AREA CATEGORY METHOD

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 96

  • SECTION 7

    AREA CATEGORY METHOD

    The total allowed lighting power for the building is the sum of all allowed lighting

    powers for all areas in the building. An “area” is all adjacent spaces which are

    associated with a single function type listed in TABLE 140.6-C.

    (TABLE 140.6-C ) X (floor area of area) = Allowed Lighting Power for that area

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 97

    Photo Credit: Acuity Brands

  • SECTION 7

    ADDITIONAL POWER ALLOTMENTS

    Additional lighting power is allowed under the Area Category Method for:

    • Specialized task work lighting

    • Ornamental lighting

    • White board lighting

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 98

    Photo Credit: Finelite Photo Credit: Tech Lighting

  • SECTION 7

    TABLE 140.6-C: AREA CATEGORY METHOD—

    LIGHTING POWER DENSITY VALUES

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 99

  • SECTION 8

    PRESCRIPTIVE APPROACH IN PRACTICE

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 100

    The following example will show the steps to determine whether the actual lighting

    power of a project will comply with the allowed lighting power budget using the

    Area Category Method:

    1. Calculate the lighting power allowance

    2. Calculate the total installed lighting power for all planned lighting from a lighting schedule

    3. Exclude portable task lighting power for the office areas, using an option available under the

    Area Category Method

    4. Apply control credits earned by specifying lighting controls that go beyond code requirements

    5. Determine the adjusted lighting power using answers from steps one through four

    6. Compare the adjusted installed lighting power to the allowed lighting power

    This section concludes with an example calculation of allowed lighting power using

    the Complete Building Method to compare results with the Area Category Method.

  • SECTION 8

    PRESCRIPTIVE APPROACH IN PRACTICE

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 101

    Forms Reference

    This example includes notes on what sections of the Certificates of

    Compliance for Nonresidential Indoor Lighting are necessary for this

    scenario. Forms can be downloaded from the Energy Commission's website:

    energy.ca.gov/title24/2013standards/nonresidential_manual.html.

    Note: The forms included in this module have been adapted for the purpose of the exercises.

    Please download the complete forms on the California Energy Commission website.

    NRCC-LTI-02-E: Indoor Lighting—Lighting Controls

    NRCC-LTI-01-E: Indoor Lighting

    NRCC-LTI-03-E: Indoor Lighting Power Allowances

  • SECTION 8

    J.S.H. ASSOCIATES

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 102

    J.S.H Associates is a 1,944-square-foot office building.

    OFFICE INFORMATION

    • Open Office: 532 ft2

    • Private Office: 222 ft2

    • Conference Room: 252 ft2

    • Main Lobby: 228 ft2

    • Kitchen: 156 ft2

    • Corridors: 278.5 ft2

    • Restroom 1: 51 ft2

    • Restroom 2: 51 ft2

    • Copy Room: 89.25 ft2

  • SECTION 8

    J.S.H. ASSOCIATES: 1,944 FT2 OFFICE BUILDING

  • SECTION 8

    PORTABLE LIGHTING

    Symbol Luminaire Quantity Watts System

    Wattage

    Efficacy

    (Lumens/Watt)

    45” LED UNDERCABINET LIGHTING Finelite Edge Undercabinet

    10 12.2 W 122 W 62.2

    LED TASK LIGHT Koncept Z Bar Mini Task Light

    6.5 22.5 W 6.5 W —

    Total Portable Lighting Watts: 128.5 W

    INDOOR LIGHTING SCHEDULE

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 104

    Symbol Luminaire Quantity Watts System

    Wattage

    Efficacy

    (Lumens/Watt)

    2x2 LED RECESSED TROFFER Cree CR22

    15 35 W 525 W 90–100

    1X4 1-LAMPFLUORESCENT RECESSED TROFFER Finelite HPR w/ Sylvania 32W T8 lamp; Sylvania Quicktronic Ballast

    4 28 W 112 W 89

    2X4 2-LAMP FLUORESCENT RECESSED TROFFER Finelite HPR w/ Sylvania 32W T8 lamp; Sylvania Quicktronic Ballast

    2 54 W 108 W 89

    6” LED RECESSED DOWNLIGHT Cree LR6

    12 12 W 144 W 90

    LED WALL SCONCE Tech Lighting Mura

    6 8 W 48 W 50

    8’ LED SUSPENDED LUMINAIRE Lunera Lighting L7-G3

    1 85 W 85 W 84

    8’ LED LINEAR WALL MOUNT LUMINAIRE Finelite Muro-Oval

    1 45.2 W 45.2 W 57.3

    LED PENDANT Philips Vetro

    3 10 W 30 W 76

    LED SUSPENDED LUMINAIRE Philips Ledino Cinta Suspension Light

    2 22.5 W 45 W 100

    Total Installed Lighting Watts: 1,142.2 W

    TOTAL LIGHTING WATTS: 1,270.7 W

  • SECTION 8

    DETERMINING COMPLIANCE WITH THE AREA CATEGORY METHOD

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 105

  • SECTION 7

    SUMMARY OF ALLOWED LIGHTING POWER

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 106

  • SECTION 8

    1. LIGHTING POWER ALLOWANCE

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 107

    REQUIRED FORMS:

    NRCC-LTI-03-E: Indoor Lighting Power Allowance

    C-2 Area Category Method General Lighting Power Allowance

    1. Determine the allowed lighting power of each area according to Table 140.6-C.

    2. Determine the square feet of each area type.

    3. Calculate the wattage allowance by multiplying the square feet of each area type

    by the additional watts allowed

    4. Total the allowed watts.

  • SECTION 8

    J.S.H ASSOCIATES: 1,944 FT2 OFFICE BUILDING

    RESTROOM #1

    51 ft2

    RESTROOM #2

    51 ft2

    COPY ROOM

    89.25 ft2 CORRIDOR

    278.5 ft2

    KITCHEN

    156 ft2

    OPEN OFFICE

    532 ft2

    PRIVATE OFFICE

    222 ft2

    CONFERENCE ROOM

    252 ft2 MAIN ENTRY LOBBY

    228 ft2

  • SECTION 7

    C-2. AREA CATEGORY METHOD

    GENERAL LIGHTING POWER ALLOWANCE

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 109

    Open Office

    Private Office

    0.75

    1.0

    532 ft2

    222 ft2

    399 W

    222 W

    1,797 W

    Conference Room

    Main Lobby

    1.2

    1.5

    252 ft2

    228 ft2

    302.4 W

    342 W Kitchen

    Corridors

    1.6

    0.6

    156 ft2

    278.5 ft2

    249.6 W

    167.1 W Restroom #1

    Restroom #2

    0.6

    0.6

    51 ft2

    51 ft2

    30.6 W

    30.6 W

    Copy Room

    Office Area > 250ft2

    Office Area ≤ 250ft2

    Classroom, Lecture, Training, Vocational

    Main Entry Lobby

    Kitchen, Food Preparation

    Corridor, Restroom, Stair, & Support

    Corridor, Restroom, Stair, & Support

    Corridor, Restroom, Stair, & Support

    Corridor, Restroom, Stair, & Support 0.6 89.25 ft2 53.7 W

    1859.75 ft2

  • SECTION 8

    ADDITIONAL LIGHTING WATTAGE ALLOWANCE

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 110

    REQUIRED FORMS:

    NRCC-LTI-03-E: Indoor Lighting Power Allowance

    C-3 Area Category Method Additional Lighting Wattage Allowance

    1. Determine the allowed lighting power of each area according to Table 140.6-C.

    2. Determine the square feet of the office primary function area.

    For white board lighting, determine the linear feet of whiteboard

    3. Calculate the wattage allowance by multiplying the square feet of each area type

    by the additional watts allowed

    4. Choose the smaller of either the newly calculated allowed watts or the total design

    watts of the luminaire

    5. Total the additional allowed watts.

  • SECTION 7

    C-3. AREA CATEGORY METHOD

    ADDITIONAL LIGHTING WATTAGE ALLOWANCE

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 111

    Classroom

    Main Entry Lobby

    7 ft

    228 ft2

    5.5 W/LF

    0.5 W/ft2

    38.5 W

    114 W

    Whiteboard Lighting: Finelite Muro Wall Mount 45.2 W 38.5 W

    Ornamental: Philips Ledino Cinta Suspended Luminaire

    61 W

    22.5 W 22.5 W

  • SECTION 8

    TOTAL LIGHTING POWER ALLOWANCE

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 112

    REQUIRED FORMS:

    NRCC-LTI-03-E: Indoor Lighting Power Allowance

    C-1 Area Category Method Total Lighting Power Allowances

    Calculate the adjusted installed lighting power by adding the additional lighting

    wattage allowance to the general lighting power allowance.

    1,797 W + 61 W = 1,858 W total allowed lighting power

  • SECTION 7

    SUMMARY OF ALLOWED LIGHTING POWER

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 113

    1,858 W

  • SECTION 8

    2. INSTALLED LIGHTING POWER

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 114

    REQUIRED FORMS:

    NRCC-LTI-01-E: Indoor Lighting—Lighting Controls

    C. Indoor Lighting Schedule and Field Inspection Energy Checklist

    The installed lighting power includes all planned permanent and portable

    lighting. Complete the lighting schedule in "C. Indoor Lighting Schedule

    and Field Inspection Energy Checklist" to determine the total to use for

    compliance purposes.

  • SECTION 7

    C. INDOOR LIGHTING SCHEDULE AND

    FIELD INSPECTION ENERGY CHECKLIST

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 115

    2x2 LED Recessed Troffer 35 W x 12 420 W Office Area > 250ft2

    Office Area > 250ft2

    Office Area ≤ 250ft2

    Office Area ≤ 250ft2

    Office Area ≤ 250ft2

    45” LED Undercabinet Lighting

    2x2 LED Recessed Troffer

    LED Task Light

    LED Suspended Luminaire

    12.2 W

    35 W

    6.5 W

    22.5 W

    x

    x

    x

    x

    10

    3

    1

    1

    122 W

    105 W

    6.5 W

    22.5 W

    #

    #

    #

    #

    #

    6” LED Recessed Downlight 12 W x 4 48 W Classroom, Lecture, Training

    Classroom, Lecture, Training

    Classroom, Lecture, Training

    8’ LED Suspended Luminaire

    8’ LED Linear Wall Mount Luminaire

    85 W

    45.2 W

    x

    x

    10

    3

    85 W

    45.2 W

    #

    #

    #

  • SECTION 7

    C. INDOOR LIGHTING SCHEDULE AND

    FIELD INSPECTION ENERGY CHECKLIST

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 116

    1,270.7 W

    Main Entry Lobby

    Main Entry Lobby

    Main Entry Lobby

    6” LED Recessed Downlight

    LED Pendant

    LED Suspended Luminaire

    12 W

    22.5 W

    10 W

    x

    x

    x

    5

    1

    3

    60 W

    22.5 W

    30 W

    #

    #

    #

    Corridor, Restroom, Support Area

    Corridor, Restroom, Support Area

    1x4 T8 Fluorescent Recessed Troffer

    2x4 T8 Fluorescent Recessed Troffer

    28 W

    54 W

    x

    x

    4

    2

    112 W

    108 W

    Corridor, Restroom, Support Area 6” LED Recessed Downlight 12 W x 3 36 W

    Corridor, Restroom, Support Area LED Wall Sconce 8 W x 6 48 W

    #

    #

    #

    #

  • SECTION 8

    3. INSTALLED PORTABLE LUMINAIRES IN OFFICES

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 117

    REQUIRED FORMS:

    NRCC-LTI-01-E: Indoor Lighting—Lighting Controls

    B. Installed Portable Luminaires in Offices—Exception to Section 140.6(a)

    When calculating actual lighting power, there is an exception to Section 140.6(a)

    that states that up to 0.3 watts per square foot of portable lighting for office

    areas shall not be required to be included in the calculation of actual indoor

    Lighting Power Density.

    • For the Complete Building Method, include the total wattage for portable

    lighting into the installed lighting total.

    • This section is used to determine if greater than 0.3 W of portable lighting is

    planned for any office.

    Two portable luminaires in the offices

    • LED undercabinet lighting in the open office area

    • LED task light in the private office

  • SECTION 8

    3. INSTALLED PORTABLE LUMINAIRES IN OFFICES

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 118

    REQUIRED FORMS:

    NRCC-LTI-01-E: Indoor Lighting—Lighting Controls

    B. Installed Portable Luminaires in Offices—Exception to Section 140.6(a)

    Two portable luminaires in the offices

    • LED undercabinet lighting in the open office area

    • LED task light in the private office

    1. Multiply the watts per luminaire by the number of luminaires to determine

    installed portable luminaire watts in this office.

    2. Determine the square feet of each office primary function area.

    3. Divide the installed portable luminaire watts by the square feet of the office to

    determine watts per square foot.

    4. Determine accountable wattage by multiplying the square feet of the office

    primary function area by the watts per square feet. If the watts per square foot

    is ≤ 0.3, claim 0 W of accountable watts for installed portable luminaires.

  • SECTION 7

    B. INSTALLED PORTABLE LUMINAIRES IN OFFICES —

    EXCEPTION TO SECTION 140.6(A)

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 119

    LED undercabinet lighting 12.2 W 10 122 W

    LED task light 6.5 W 1 6.5 W

    532ft2

    222ft2

    0.23 W/ft2

    0.03 W/ft2

    0

    0

    Office > 250 ft2

    Office ≤ 250 ft2

    0

    0

    0 W

    P

    P

    P

    The new Installed Lighting total with the exclusion of portable luminaire wattage is 1,178.2

  • SECTION 8

    4. LIGHTING CONTROL CREDITS

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 120

    REQUIRED FORMS:

    NRCC-LTI-02-E: Indoor Lighting—Lighting Controls

    Mandatory and Prescriptive Indoor Lighting Control Schedule,

    PAF Calculation, and Field Inspection Checklist

    This lighting plan exceeds the mandatory requirements for lighting controls

    • Partial-ON occupancy controls in the restrooms and copy room

    Complies with §130.1(a), §130.1(c), and §140.6(a)2

    • Combined manual dimming plus partial-ON occupant sensing control in

    the conference room controlling pendants and suspended luminaire

    Complies with §130.1(a), §130.1(b), §130.1(c), §130.1(d), and §140.6(a)2

  • SECTION 7

    MANDATORY AND PRESCRIPTIVE INDOOR LIGHTING CONTROL

    SCHEDULE, PAF CALCULATION, AND FIELD INSPECTION CHECKLIST

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 121

    Restroom #1 Partial-ON occupancy Sensor 5.6

    55.65 W

    Restroom #1 Partial-ON occupancy Sensor 5.6

    Copy Room Partial-ON occupancy Sensor

    1

    1

    1

    28 W

    28 W

    56 W

    0.20

    0.20

    0.20 11.2

    Conference Room Combined Manual Dimming and Partial-ON

    Occupancy Sensor

    1 133 W 0.25 33.25

    P

    P

    P

    P

    P P P E

    P P P E

    P P P E

    E

    E

    E

    P P P P P E

  • SECTION 8

    5. ADJUSTED LIGHTING POWER

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 122

    REQUIRED FORMS:

    NRCC-LTI-02-E: Indoor Lighting—Lighting Controls

    Summary of Allowed Lighting Power

    Use the "Summary of Allowed Lighting Power" in Form NRCC-LTI-01-E to

    calculate the adjusted installed lighting power by adding the portable lighting and

    subtracting the lighting control credits from the total installed lighting.

    1,142.2 W + 0 W – 55.65 W = 1,086.55 W total adjusted installed lighting power

  • SECTION 7

    6. COMPARE ADJUSTED INSTALLED LIGHTING POWER TO

    ALLOWED LIGHTING POWER

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 123

    1,858 W

    1,142.2 W

    0 W

    55.65 W

    1,086.55 W

    Our lighting plan is compliant.

    REQUIRED FORMS:

    NRCC-LTI-01-E: Indoor Lighting

    Summary of Allowed Lighting Power

  • SECTION 7

    COMPLETE BUILDING METHOD

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 124

  • SECTION 7

    COMPLETE BUILDING METHOD

    The Complete Building Method may only be used on projects involving entire

    buildings with one primary type of use or in mixed-use buildings or tenant spaces

    where 90% of the spaces have one primary use.

    This is the simplest way to comply with the standards, and many will attempt this

    method first before trying one of the two more complex methods.

    (TABLE 140.6-B ) X (floor area of entire building ) = Allowed Lighting Power

    SLIDE 125 10/12/2015 PRESCRIPTIVE APPROACH

  • SECTION 8

    LIGHTING POWER ALLOWANCE

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 126

    REQUIRED FORMS:

    NRCC-LTI-03-E: Indoor Lighting Power Allowance

    B. Complete Building Method Lighting Power Allowance

    1. Determine the allowed lighting power density of an office building according to

    Table 140.6-B.

    2. Multiply the allowed lighting power density by the area of the space.

  • SECTION 7

    B. COMPLETE BUILDING METHOD LIGHTING POWER ALLOWANCE

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 127

    Office Building 0.8 W/ft2 1,944 ft2 1,555.2 W

    1,555.2 W

    1,555.2 W

    1,306.7 W

    P

  • SECTION 7

    REQUIRED FORMS:

    NRCC-LTI-01-E: Indoor Lighting

    Summary of Allowed Lighting Power

    SUMMARY OF ALLOWED LIGHTING POWER

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 128

    1,270.7 W

    55.65 W

    1,215.05 W

    1,555.2 W

    Our lighting plan is compliant.

  • SECTION 7

    TAILORED METHOD

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 129

  • SECTION 7

    TAILORED METHOD

    This is the most granular of the three methods.

    • Allowances for each area (just like area category)

    • Allowances for display and task lighting within an area

    Allowed lighting power is determined by the occupancy type and the

    physical characteristics (e.g. ceiling height) of a space.

    See Table 140.6-D for details.

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 130

  • SECTION 7

    ALLOWANCES UNDER THE TAILORED METHOD

    The Tailored Method adds additional lighting power allowances for:

    • Wall displays

    • Floor displays

    • Task lighting

    • Ornamental/special effects lighting

    • Very valuable display cases

    These lighting power allowances cannot be used in any space other

    than the display or task area. Any wattage not covered by these

    allowances must be deducted from the general lighting allowance for

    that area.

    SLIDE 131 10/12/2015 PRESCRIPTIVE APPROACH

  • SECTION 7

    EXTERIOR SPACES

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 132

    Photo: Cree

  • SECTION 7

    LIGHTING ZONES

    Lighting Zone 1: Government parks, recreation areas, and wildlife preserves

    Ambient Illumination: Dark

    The local entity with authority over the property will know if the property is a

    government designated park, recreation area, or wildlife preserve. If the park is

    within a rural or urban area, it can be considered a part of lighting zone two or three.

    Lighting Zone 2: Rural Areas

    Ambient Illumination: Low

    Rural areas include any population, housing, and territory that contain

    less than 2,500 people.

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 133

  • SECTION 7

    LIGHTING ZONES

    Lighting Zone 3: Urban Areas

    Ambient Illumination: Medium

    An urban area is a densely settled core of census tracts that contain

    at least 2,500 people.

    Lighting Zone 4: Special Use District

    Ambient Illumination: High

    This zone may be created by a local government through application

    to the California Energy Commission and is used for special area

    types that require a particularly high amount of light.

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 134

  • SECTION 7

    LIGHTING POWER ALLOWANCES

    The allowed lighting power for a space is determined by measuring

    the area of the installation and multiplying by the lighting power

    allowance for that space.

    The actual lighting power is the total watts of all non-exempt lighting

    systems (including ballast, driver, or transformer losses).

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 135

  • SECTION 7

    LIGHTING POWER ALLOWANCES

    When determining allowed lighting power, the

    number of luminaires, their mounting heights, and

    their layout affect the size of the illuminated area and

    thus the allowed lighting power for a space.

    The illuminated area is any hardscape area within

    a square around each luminaire or pole, less any

    obstructions. The size of this square is 10 times the

    luminaire mounting height, with the luminaire in

    the middle of the square.

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 136

  • SECTION 7

    LIGHTING POWER ALLOWANCES

    There are three major areas that are considered when determining the

    allowed lighting power for a space:

    Area Wattage Allowances (AWA)

    The Area Wattage Allowance is determined for the total illuminated

    hardscape area.

    Linear Wattage Allowances (LWA)

    The Linear Wattage Allowance is determined for the total perimeter

    length of the hardscape. The total hardscape perimeter does not

    include areas that are not illuminated.

    Initial Wattage Allowances (IWA)

    The Initial Wattage Allowance may be used once per project site.

    The IWA provides additional wattage for small sites or for unusual

    hardscape geometries.

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 137

  • SECTION 7

    LIGHTING POWER ALLOWANCES

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 138

  • SECTION 7

    PLANTERS AND LANDSCAPE AREAS

    Planters and small landscape areas are included

    within the general hardscape area as long as the

    width or length of the inclusion is less than 10 ft.,

    and the inclusion is bordered on at least three sides.

    Landscape areas that are greater than 10 ft. in both

    width and length are excluded from the general

    hardscape area calculation, but the perimeter of

    these exclusions may be included in the linear

    wattage allowance (LWA) calculation

    10/12/2015 PRESCRIPTIVE APPROACH SLIDE 139


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