PRESCRIPTIVE APPROACH

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.

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. 10/12/2015 SLIDE 91 SECTION 7 PRESCRIPTIVE APPROACH

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 SLIDE 92 SECTION 7 PRESCRIPTIVE APPROACH

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 ft 2 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) 10/12/2015 SLIDE 93 SECTION 7 PRESCRIPTIVE APPROACH

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 Photo: Jessie Whiteman 10/12/2015 SLIDE 94 SECTION 7 PRESCRIPTIVE APPROACH

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. 10/12/2015 SLIDE 95 SECTION 7 PRESCRIPTIVE APPROACH

AREA CATEGORY METHOD 10/12/2015 SLIDE 96 SECTION 7 PRESCRIPTIVE APPROACH

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 Photo Credit: Acuity Brands 10/12/2015 SLIDE 97 SECTION 7 PRESCRIPTIVE APPROACH

ADDITIONAL POWER ALLOTMENTS Additional lighting power is allowed under the Area Category Method for: Specialized task work lighting Ornamental lighting White board lighting Photo Credit: Finelite Photo Credit: Tech Lighting 10/12/2015 SLIDE 98 SECTION 7 PRESCRIPTIVE APPROACH

TABLE 140.6-C: AREA CATEGORY METHOD LIGHTING POWER DENSITY VALUES 10/12/2015 SLIDE 99 SECTION 7 PRESCRIPTIVE APPROACH

PRESCRIPTIVE APPROACH IN PRACTICE 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. 10/12/2015 SLIDE 100 SECTION 8 PRESCRIPTIVE APPROACH

PRESCRIPTIVE APPROACH IN PRACTICE 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. NRCC-LTI-01-E: Indoor Lighting NRCC-LTI-02-E: Indoor Lighting Lighting Controls NRCC-LTI-03-E: Indoor Lighting Power Allowances 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. 10/12/2015 SLIDE 101 SECTION 8 PRESCRIPTIVE APPROACH

J.S.H. ASSOCIATES J.S.H Associates is a 1,944-square-foot office building. OFFICE INFORMATION Open Office: 532 ft 2 Private Office: 222 ft 2 Conference Room: 252 ft 2 Main Lobby: 228 ft 2 Kitchen: 156 ft 2 Corridors: 278.5 ft 2 Restroom 1: 51 ft 2 Restroom 2: 51 ft 2 Copy Room: 89.25 ft 2 10/12/2015 SLIDE 102 SECTION 8 PRESCRIPTIVE APPROACH

J.S.H. ASSOCIATES: 1,944 FT 2 OFFICE BUILDING SECTION 8

INDOOR LIGHTING SCHEDULE Symbol Luminaire Quantity Watts 2x2 LED RECESSED TROFFER Cree CR22 System Wattage Efficacy (Lumens/Watt) 15 35 W 525 W 90 100 1X4 1-LAMPFLUORESCENT RECESSED TROFFER Finelite HPR w/ Sylvania 32W T8 lamp; Sylvania Quicktronic Ballast 2X4 2-LAMP FLUORESCENT RECESSED TROFFER Finelite HPR w/ Sylvania 32W T8 lamp; Sylvania Quicktronic Ballast 6 LED RECESSED DOWNLIGHT Cree LR6 LED WALL SCONCE Tech Lighting Mura 8 LED SUSPENDED LUMINAIRE Lunera Lighting L7-G3 8 LED LINEAR WALL MOUNT LUMINAIRE Finelite Muro-Oval LED PENDANT Philips Vetro LED SUSPENDED LUMINAIRE Philips Ledino Cinta Suspension Light 4 28 W 112 W 89 2 54 W 108 W 89 12 12 W 144 W 90 6 8 W 48 W 50 1 85 W 85 W 84 1 45.2 W 45.2 W 57.3 3 10 W 30 W 76 2 22.5 W 45 W 100 PORTABLE LIGHTING Symbol Luminaire Quantity Watts 45 LED UNDERCABINET LIGHTING Finelite Edge Undercabinet Total Installed Lighting Watts: 1,142.2 W System Wattage Efficacy (Lumens/Watt) 10 12.2 W 122 W 62.2 LED TASK LIGHT Koncept Z Bar Mini Task Light TOTAL LIGHTING WATTS: 1,270.7 W 6.5 22.5 W 6.5 W Total Portable Lighting Watts: 128.5 W 10/12/2015 SLIDE 104 SECTION 8 PRESCRIPTIVE APPROACH

DETERMINING COMPLIANCE WITH THE AREA CATEGORY METHOD 10/12/2015 SLIDE 105 SECTION 8 PRESCRIPTIVE APPROACH

SUMMARY OF ALLOWED LIGHTING POWER 10/12/2015 SLIDE 106 SECTION 7 PRESCRIPTIVE APPROACH

1. LIGHTING POWER ALLOWANCE 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. 10/12/2015 SLIDE 107 SECTION 8 PRESCRIPTIVE APPROACH

J.S.H ASSOCIATES: 1,944 FT 2 OFFICE BUILDING RESTROOM #1 51 ft 2 RESTROOM #2 51 ft 2 OPEN OFFICE 532 ft 2 PRIVATE OFFICE 222 ft 2 COPY ROOM 89.25 ft 2 CORRIDOR 278.5 ft 2 KITCHEN 156 ft 2 CONFERENCE ROOM 252 ft 2 MAIN ENTRY LOBBY 228 ft 2 SECTION 8

C-2. AREA CATEGORY METHOD GENERAL LIGHTING POWER ALLOWANCE Open Office Private Office Conference Room Main Lobby Kitchen Corridors Restroom #1 Restroom #2 Copy Room Office Area > 250ft 2 Office Area 250ft 2 0.75 1.0 532 ft 2 222 ft 2 399 W 222 W Classroom, Lecture, Training, Vocational 1.2 252 ft 2 302.4 W Main Entry Lobby 1.5 228 ft 2 342 W Kitchen, Food Preparation 1.6 156 ft 2 249.6 W Corridor, Restroom, Stair, & Support 0.6 278.5 ft 2 167.1 W Corridor, Restroom, Stair, & Support 0.6 51 ft 2 30.6 W Corridor, Restroom, Stair, & Support 0.6 51 ft 2 30.6 W Corridor, Restroom, Stair, & Support 0.6 89.25 ft 2 53.7 W 1859.75 ft 2 1,797 W 10/12/2015 SLIDE 109 SECTION 7 PRESCRIPTIVE APPROACH

ADDITIONAL LIGHTING WATTAGE ALLOWANCE 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. 10/12/2015 SLIDE 110 SECTION 8 PRESCRIPTIVE APPROACH

C-3. AREA CATEGORY METHOD ADDITIONAL LIGHTING WATTAGE ALLOWANCE Classroom 7 ft 5.5 W/LF 38.5 W Whiteboard Lighting: Finelite Muro Wall Mount 45.2 W 38.5 W Main Entry Lobby 228 ft 2 0.5 W/ft 2 114 W Ornamental: Philips Ledino Cinta Suspended Luminaire 22.5 W 22.5 W 61 W 10/12/2015 SLIDE 111 SECTION 7 PRESCRIPTIVE APPROACH

TOTAL LIGHTING POWER ALLOWANCE 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 10/12/2015 SLIDE 112 SECTION 8 PRESCRIPTIVE APPROACH

SUMMARY OF ALLOWED LIGHTING POWER 1,858 W 10/12/2015 SLIDE 113 SECTION 7 PRESCRIPTIVE APPROACH

2. INSTALLED LIGHTING POWER 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. 10/12/2015 SLIDE 114 SECTION 8 PRESCRIPTIVE APPROACH

C. INDOOR LIGHTING SCHEDULE AND FIELD INSPECTION ENERGY CHECKLIST # # # # # # # # 2x2 LED Recessed Troffer 35 W x 12 420 W Office Area > 250ft 2 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 Office Area > 250ft 2 Office Area 250ft 2 Office Area 250ft 2 Office Area 250ft 2 6 LED Recessed Downlight 12 W x 4 48 W 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 Classroom, Lecture, Training Classroom, Lecture, Training 10/12/2015 SLIDE 115 SECTION 7 PRESCRIPTIVE APPROACH

C. INDOOR LIGHTING SCHEDULE AND FIELD INSPECTION ENERGY CHECKLIST # # # # # # # 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 1x4 T8 Fluorescent Recessed Troffer 28 W x 4 112 W 2x4 T8 Fluorescent Recessed Troffer 54 W x 2 108 W 6 LED Recessed Downlight 12 W x 3 36 W LED Wall Sconce 8 W x 6 48 W Main Entry Lobby Main Entry Lobby Main Entry Lobby Corridor, Restroom, Support Area Corridor, Restroom, Support Area Corridor, Restroom, Support Area Corridor, Restroom, Support Area 1,270.7 W 10/12/2015 SLIDE 116 SECTION 7 PRESCRIPTIVE APPROACH

3. INSTALLED PORTABLE LUMINAIRES IN OFFICES 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 10/12/2015 SLIDE 117 SECTION 8 PRESCRIPTIVE APPROACH

3. INSTALLED PORTABLE LUMINAIRES IN OFFICES 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. 10/12/2015 SLIDE 118 SECTION 8 PRESCRIPTIVE APPROACH

B. INSTALLED PORTABLE LUMINAIRES IN OFFICES EXCEPTION TO SECTION 140.6(A) P P P LED undercabinet lighting 12.2 W 10 122 W 532ft 2 0.23 W/ft 2 0 0 Office > 250 ft 2 LED task light 6.5 W 1 6.5 W 222ft 2 0.03 W/ft 2 0 0 Office 250 ft 2 0 W The new Installed Lighting total with the exclusion of portable luminaire wattage is 1,178.2 10/12/2015 SLIDE 119 SECTION 7 PRESCRIPTIVE APPROACH

4. LIGHTING CONTROL CREDITS 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 10/12/2015 SLIDE 120 SECTION 8 PRESCRIPTIVE APPROACH

MANDATORY AND PRESCRIPTIVE INDOOR LIGHTING CONTROL SCHEDULE, PAF CALCULATION, AND FIELD INSPECTION CHECKLIST Restroom #1 Partial-ON occupancy Sensor 1 P E P E P 28 W 0.20 5.6 Restroom #1 Partial-ON occupancy Sensor 1 P E P E P 28 W 0.20 5.6 Copy Room Partial-ON occupancy Sensor 1 P E P E P 56 W 0.20 11.2 Conference Room Combined Manual Dimming 1 P P P P E P 133 W 0.25 33.25 and Partial-ON Occupancy Sensor P P P P 55.65 W 10/12/2015 SLIDE 121 SECTION 7 PRESCRIPTIVE APPROACH

5. ADJUSTED LIGHTING POWER 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 10/12/2015 SLIDE 122 SECTION 8 PRESCRIPTIVE APPROACH

6. COMPARE ADJUSTED INSTALLED LIGHTING POWER TO ALLOWED LIGHTING POWER REQUIRED FORMS: NRCC-LTI-01-E: Indoor Lighting Summary of Allowed Lighting Power 1,142.2 W 0 W 55.65 W 1,086.55 W 1,858 W Our lighting plan is compliant. SECTION 7

COMPLETE BUILDING METHOD 10/12/2015 SLIDE 124 SECTION 7 PRESCRIPTIVE APPROACH

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 10/12/2015 SLIDE 125 SECTION 7 PRESCRIPTIVE APPROACH

LIGHTING POWER ALLOWANCE 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. 10/12/2015 SLIDE 126 SECTION 8 PRESCRIPTIVE APPROACH

B. COMPLETE BUILDING METHOD LIGHTING POWER ALLOWANCE P 1,555.2 W 1,306.7 W Office Building 0.8 W/ft 2 1,944 ft 2 1,555.2 W 1,555.2 W 10/12/2015 SLIDE 127 SECTION 7 PRESCRIPTIVE APPROACH

SUMMARY OF ALLOWED LIGHTING POWER REQUIRED FORMS: NRCC-LTI-01-E: Indoor Lighting Summary of Allowed Lighting Power 1,270.7 W 55.65 W 1,215.05 W 1,555.2 W Our lighting plan is compliant. 10/12/2015 SLIDE 128 SECTION 7 PRESCRIPTIVE APPROACH

TAILORED METHOD 10/12/2015 SLIDE 129 SECTION 7 PRESCRIPTIVE APPROACH

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 SLIDE 130 SECTION 7 PRESCRIPTIVE APPROACH

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. 10/12/2015 SLIDE 131 SECTION 7 PRESCRIPTIVE APPROACH

EXTERIOR SPACES Photo: Cree 10/12/2015 SLIDE 132 SECTION 7 PRESCRIPTIVE APPROACH

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 SLIDE 133 SECTION 7 PRESCRIPTIVE APPROACH

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 SLIDE 134 SECTION 7 PRESCRIPTIVE APPROACH

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 SLIDE 135 SECTION 7 PRESCRIPTIVE APPROACH

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 SLIDE 136 SECTION 7 PRESCRIPTIVE APPROACH

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 SLIDE 137 SECTION 7 PRESCRIPTIVE APPROACH

LIGHTING POWER ALLOWANCES 10/12/2015 SLIDE 138 SECTION 7 PRESCRIPTIVE APPROACH

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 SLIDE 139 SECTION 7 PRESCRIPTIVE APPROACH