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2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
PRESCRIPTIVE APPROACH
1. Actual and Allowed LPD
2. Complete Building Method
3. Area Category Method
4. Tailored Method
5. Reduced Wattage Method for Alterations
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.
PRESCRIPTIVE APPROACH | SECTION 5
THE COMPLIANCE PROCESS
89
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.
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
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 (Power Adjustment
Factors)
2. Lighting wattage exclusions
90
PRESCRIPTIVE APPROACH | SECTION 5 91
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
ACTUAL LIGHTING POWER: REDUCTION THROUGH CONTROLSIf 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 :
(100 W) X (0.2) = 20 W of excluded lighting power (80 W total)
92
PRESCRIPTIVE APPROACH | SECTION 5
LIGHTING WATTAGE EXCLUSIONSWattage of many lighting applications may be excluded, including:
• Theme parks, dance floors, theatres, religious worship, dressing rooms, temporary
exhibits, surgical lighting,
• 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
• Lighting for plant growth or maintenance
93
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
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.
94
PRESCRIPTIVE APPROACH | SECTION 5
ADDITIONAL POWER ALLOTMENTS
95
Additional lighting power is allowed under the Area Category Method for:
• Specialized task work lighting
• Ornamental, precision, accent, display, decorative lighting
• White board and chalk board lighting
Photo Credit: Finelite Photo Credit: Tech Lighting
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 96
PRESCRIPTIVE APPROACH | SECTION 5 97
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5PRESCRIPTIVE APPROACH | SECTION 7
Prescriptive Approach in Practice
98
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.
PRESCRIPTIVE APPROACH | SECTION 7
PRESCRIPTIVE APPROACH | SECTION 5PRESCRIPTIVE APPROACH | SECTION 7
Prescriptive Approach in Practice
99PRESCRIPTIVE APPROACH | SECTION 7
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/title24/2016standards/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
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
J.S.H Associates is a 1,944-square-foot (gross) 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
100
J.S.H. ASSOCIATES
PRESCRIPTIVE APPROACH | SECTION 5 101
J.S.H. ASSOCIATES FLOOR PLAN
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 102
Indoor Lighting Schedule
PORTABLE LIGHTING
Symbol Luminaire Quantity Watts System Wattage
Efficacy (Lumens/Watt)
45” LED UNDERCABINET LIGHTINGFinelite Edge Undercabinet 10 12.2 W 122 W 62.2
LED TASK LIGHTKoncept Z Bar Mini Task Light 6.5 22.5 W 6.5 W —
Total Portable Lighting Watts: 128.5 W
Symbol Luminaire Quantity Watts System Wattage
Efficacy (Lumens/Watt)
2x2 LED RECESSED TROFFERCree CR22 15 35 W 525 W 90–100
1X4 1-LAMPFLUORESCENT RECESSED TROFFERFinelite HPR w/ Sylvania 32W T8 lamp; Sylvania Quicktronic Ballast 4 28 W 112 W 89
2X4 2-LAMP FLUORESCENT RECESSED TROFFERFinelite HPR w/ Sylvania 32W T8 lamp; Sylvania Quicktronic Ballast 2 54 W 108 W 89
6” LED RECESSED DOWNLIGHTCree LR6 12 12 W 144 W 90
LED WALL SCONCETech Lighting Mura 6 8 W 48 W 50
8’ LED SUSPENDED LUMINAIRELunera Lighting L7-G3 1 85 W 85 W 84
8’ LED LINEAR WALL MOUNT LUMINAIREFinelite Muro-Oval 1 45.2 W 45.2 W 57.3
LED PENDANTPhilips Vetro 3 10 W 30 W 76
LED SUSPENDED LUMINAIREPhilips 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
PRESCRIPTIVE APPROACH | SECTION 5
AREA CATEGORY METHOD
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 104
Summary of Allowed Lighting Power
PRESCRIPTIVE APPROACH | SECTION 5 105
1. Lighting Power AllowanceREQUIRED 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.
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 106
J.S.H Associates: 1,944 ft2 Office Building
RESTROOM #1
51 ft2
RESTROOM #2
51 ft2
COPY ROOM89.25 ft2
CORRIDOR278.5 ft2
KITCHEN156 ft2
OPEN OFFICE532 ft2
PRIVATE OFFICE222 ft2
CONFERENCE ROOM
252 ft2MAIN ENTRY LOBBY
228 ft2
PRESCRIPTIVE APPROACH | SECTION 5 107
C-2. Area Category Method General Lighting Power Allowance
Open OfficePrivate Office
0.751.0
532 ft2
222 ft2399 W222 W
1,609 W
Conference RoomMain Lobby
1.20.95
252 ft2
228 ft2302.4 W217 W
KitchenCorridors
1.20.6
156 ft2
278.5 ft2188 W
167.1 WRestroom #1Restroom #2
0.60.6
51 ft2
51 ft230.6 W30.6 W
Copy Room
Office Area > 250ft2
Office Area ≤ 250ft2
Classroom, Lecture, Training, VocationalMain Entry Lobby
Kitchen, Food PreparationCorridor, Restroom, Stair, & SupportCorridor, Restroom, Stair, & Support
Corridor, Restroom, Stair, & SupportCorridor, Restroom, Stair, & Support 0.6 89.25 ft2 53.7 W
1860 ft2
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 108
Additional Lighting Wattage AllowanceREQUIRED 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.
PRESCRIPTIVE APPROACH | SECTION 5 109
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 110
C-3. Area Category Method Additional Lighting Wattage Allowance
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
PRESCRIPTIVE APPROACH | SECTION 5 111
Total Lighting Power AllowanceREQUIRED 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.
1,609 W + 61 W = 1,670 W total allowed lighting power
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 112
Summary of Allowed LIGHTING POWER
1,670 W
PRESCRIPTIVE APPROACH | SECTION 5 113
2. Installed Lighting PowerREQUIRED 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 “H. Indoor Lighting Schedule and
Field Inspection Energy Checklist" to determine the total to use for compliance
purposes.
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 114
C. Indoor Lighting Schedule andField Inspection Energy Checklist
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 Lighting2x2 LED Recessed Troffer
LED Task LightLED Suspended Luminaire
12.2 W35 W6.5 W
22.5 W
xxxx
10311
122 W105 W6.5 W
22.5 W
#####
6” LED Recessed Downlight 12 W x 4 48 W Classroom, Lecture, Training
Classroom, Lecture, Training
Classroom, Lecture, Training8’ LED Suspended Luminaire
8’ LED Linear Wall Mount Luminaire85 W
45.2 W
xx
103
85 W45.2 W
###
PRESCRIPTIVE APPROACH | SECTION 5 115
C. Indoor Lighting Schedule andField Inspection Energy Checklist
1,270.7 W
Main Entry Lobby
Main Entry Lobby
Main Entry Lobby
6” LED Recessed DownlightLED Pendant
LED Suspended Luminaire
12 W22.5 W10 W
xxx
513
60 W22.5 W30 W
###
Corridor, Restroom, Support Area
Corridor, Restroom, Support Area1x4 T8 Fluorescent Recessed Troffer2x4 T8 Fluorescent Recessed Troffer
28 W54 W
xx
42
112 W108 W
Corridor, Restroom, Support Area6” LED Recessed Downlight 12 W x 3 36 WCorridor, Restroom, Support AreaLED Wall Sconce 8 W x 6 48 W
####
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 116
Summary of Allowed LIGHTING POWER
1,670 W
1,270.7 W
PRESCRIPTIVE APPROACH | SECTION 5 117
3. Installed Portable Luminaires in OfficesREQUIRED 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
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 118
3. Installed Portable Luminaires in OfficesREQUIRED 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.
PRESCRIPTIVE APPROACH | SECTION 5 119
3. Installed Portable Luminaires in Offices
Undercabinet
Task Light 6.5 W
12.2 W 10 122 W
1 6.5 W
532
222
0.23
0.03
0
0
0
Open Office
Private Office
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 120
Summary of Allowed LIGHTING POWER
1,670 W
1,270.7 W
0 W
PRESCRIPTIVE APPROACH | SECTION 5 121
4. LIGHTING CONTROL CREDITSREQUIRED 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 does not exceed 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
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 122
PRESCRIPTIVE APPROACH | SECTION 5 123
Mandatory and Prescriptive Indoor Lighting Control Schedule, PAF Calculation, and Field Inspection Checklist
Restroom #1 Partial-ON occupancy SensorRestroom #1 Partial-ON occupancy SensorCopy Room Partial-ON occupancy Sensor
111
Conference Room Combined Manual Dimming and Partial-ON
Occupancy Sensor
1
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 124
5. ADJUSTED LIGHTING POWERREQUIRED 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.
1,270.2 W + 0 W – 0 W = 1,270.2 W total adjusted installed lighting power
PRESCRIPTIVE APPROACH | SECTION 5 125
6. Compare Adjusted Installed Lighting Power to Allowed Lighting Power
1,670 W
1,270.7 W
0 W
0 W
1,270.7 W
Our lighting plan is compliant.
REQUIRED FORMS:
NRCC-LTI-01-E: Indoor Lighting
Summary of Allowed Lighting Power
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
COMPLETE BUILDING METHOD
PRESCRIPTIVE APPROACH | SECTION 5
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
127
2016 Building Energy Efficiency Standards:Nonresidential Office
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PRESCRIPTIVE APPROACH | SECTION 5 128
LIGHTING POWER ALLOWANCEREQUIRED 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.
PRESCRIPTIVE APPROACH | SECTION 5 129
LIGHTING POWER ALLOWANCE
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 130
B. Complete Building Method Lighting Power Allowance
Office Building 0.8 W/ft2 1,944 ft2 1,555.2 W
1,555.2 W
1,555.2 W
1,555.2 W
PRESCRIPTIVE APPROACH | SECTION 5 131
Summary of Allowed LIGHTING POWERREQUIRED FORMS:
NRCC-LTI-01-E: Indoor Lighting
Summary of Allowed Lighting Power
Our lighting plan is compliant.
1,555 W
1,270 W
0 W
0 W
1,270.2 W
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
TAILORED METHOD
PRESCRIPTIVE APPROACH | SECTION 5
TAILORED METHOD
133
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.
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
TAILORED METHOD ALLOWANCES
134
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.
PRESCRIPTIVE APPROACH | SECTION 5
ALTERATION COMPLIANCE
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5 136
TITLE 24 TRIGGERS – INTERIOR ALTERATIONS2016 Indoor Luminaire Component Modification: >70 per floor/tenant per year changed fixtures: 3 or more fixtures per room
Entire Luminaire Alterations: >10% moved, changed, replaced fixtures: 3 or more fixtures per room
Mandatory Control
Table 141.0-E Reduced installed wattage from existing method*
§141.0(b)2Jii
Adding to connected
load or remodeling
Reduced LPD(§140.6) ≤85% of allowable
Reduced LPD (§140.6)>85-100% of allowable
Area device (on/off):§130.1(a)1,2,3
YesExcluding 130.1(a)4: separately
controlled lighting systems.
YesExcluding 130.1(a)4: separately
controlled lighting systems.
YesExcluding 130.1(a)4: separately controlled lighting
systems.Yes
Multi-level control: §130.1(b)
Yes2 level or 130.1(b)Only for modified
luminaires
YesOnly for modified luminaires No Yes
Auto shut-off control: §130.1(c)
Yes Yes
Yes: auto shut-off all building types.Partial-OFF required for warehouse
and parking garagesPartial-OFF excluded at:130.1(c)6B: libraries / 130.1(c)6C:/7A stairs/corridors 130.1(c)8: Hotel/Motel guest rm 30 min. controls N/A
Yes
Daylighting control: §130.1(d) No Yes
Only for modified luminaires No Yes
Demand response: §130.1(e) No Yes No Yes
Acceptance test technician required when any number of controls for >20 fixtures being added for project*50% Office, retail and hotel occupancies / *35% All other occupancies
PRESCRIPTIVE APPROACH | SECTION 5
50/35 REDUCED WATTAGE METHOD
137
New compliance pathway for 2016 standards:
• A retrofit project may bypass additional multilevel and some occupancy
control requirements by installing new products that achieve a minimum
of 35% power reduction at full output as compared to the luminaires they
replaced.
• For hotel, office and retail occupancies, the reduction must be at least
50%.
• New form introduced for this compliance pathway
2016-NRCC-LTI-06-E
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
2016-NRCC-LTI-06-E
138
4-lamp T8, 32 W, 2x4, Rapid Start Ballast, Normal Output 114 W 30
1710
PRESCRIPTIVE APPROACH | SECTION 5
2016-NRCC-LTI-06-E
139
1,270 W
0 W
0 W
1,270 W
Our lighting plan is compliant.
1,710 W
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
EXTERIOR SPACES
140
Photo: Cree
PRESCRIPTIVE APPROACH | SECTION 5
LIGHTING ZONES
Lighting Zone 0: Underdeveloped areas in parks and preserves
Ambient Illumination: Dark Sky
Where no continuous lighting is intended. Sites may utilize a single luminaire of 15 Watts of less at
entrances to parking lots, trail heads, or other areas in order to safely illuminate site facilities.
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.
141
2016 Building Energy Efficiency Standards:Nonresidential Office
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PRESCRIPTIVE APPROACH | SECTION 5
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.
142
PRESCRIPTIVE APPROACH | SECTION 5
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).
143
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
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.
144
PRESCRIPTIVE APPROACH | SECTION 5
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.
145
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
LIGHTING POWER ALLOWANCES
146
PRESCRIPTIVE APPROACH | SECTION 5
PLANTERS AND LANDSCAPE AREAS
147
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
2016 Building Energy Efficiency Standards:Nonresidential Office
3/15/2017
PRESCRIPTIVE APPROACH | SECTION 5
Calculate the total power allowance for area!
148
PRESCRIPTIVE APPROACH | SECTION 5
Calculate the total power allowance for area!
149
2016 Building Energy Efficiency Standards:Nonresidential Office
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PRESCRIPTIVE APPROACH | SECTION 5
NRCC-LTO-01-E: Overview of Compliance
150
PRESCRIPTIVE APPROACH | SECTION 5
NRCC-LTO-03-E: Wattage Allowances
151
2016 Building Energy Efficiency Standards:Nonresidential Office
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PRESCRIPTIVE APPROACH | SECTION 5
NRCC-LTO-04-E: Existing Wattages
152
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