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PRESCRIPTIVE APPROACH
1. Actual and allowed LPD
2. Complete Building Method
3. Area Category Method
4. Tailored Method
SECTION 5
ACTUAL VS. ALLOWED LIGHTING POWER DENSITY
A building complies with under the prescriptive method if the actual
lighting power density is less than the allowed indoor lighting power.
The allowed indoor lighting power density for each building type
or primary function area is calculated using the Complete Building,
Area Category, or Tailored methods.
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 76
SECTION 5
ACTUAL VS. ALLOWED LIGHTING POWER DENSITY
The actual indoor lighting power of the proposed building area is the
total watts of all planned, permanent and portable lighting systems,
adjusted by the following:
1. Multiple interlocked lighting systems
2. Reduction of wattage through controls
3. Lighting wattage exclusions
4. Indoor lighting power trade-offs
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 77
Photo Credit: Color Kinetics
SECTION 5
ACTUAL LPD: INTERLOCKED LIGHTING SYSTEMS
When multiple interlocked lighting systems serve a single space, the watts
of all systems except the system with the highest wattage may be excluded if
the lighting systems are interlocked with a non-programmable double-throw
switch to prevent simultaneous operation.
Spaces included:
• Auditorium
• Convention center
• Conference room
• Multipurpose room
• Theatre
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 78
SECTION 5
ALLOWED LPD: LIGHTING POWER TRADE-OFFS
Complete Building Method: Within a single building.
Allowed lighting power may not be traded between two
or more buildings.
Area Category Method: Between the primary function
areas. Conditioned and unconditioned spaces must be
separate allotments, met separately without trade - offs.
Tailored Method: Within the primary function areas for
general illumination. Wall display, floor display and
ornamental / special effects lighting must be separate
allotments without trade - offs.
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 79
SECTION 5
ALLOWED LPD: COMPLETE BUILDING METHOD
The Complete Building Method may only be used on projects
involving entire buildings with one primary type of use occupancy.
• May only be used when the applicant is applying for a lighting permit
• Must submit plans and specifications for the entire building
• (TABLE 146-E ) X (floor area of entire building ) = Allowed LPD
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 80
Retail and wholesale stores, hotel / motel, and high - rise
residential buildings may not use this method.
SECTION 5
TABLE 146-E
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 81
Can be found:
(Page 120) 2008 Building
Energy Efficiency Standards
SECTION 5
ALLOWED LPD: 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 accommodate or are associated
with a single one of the primary functions listed in TABLE 146-F.
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 82
Photo Credit:
Philips
Photo Credit:
Philips Photo Credit:
Philips
SECTION 5
TABLE 146-F
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 83
Can be found:
(Page 121) 2008 Building
Energy Efficiency Standards
SECTION 5
ALLOWED LPD: AREA CATEGORY METHOD
When the Area Category Method is used to calculate the allowed total
lighting power for an entire building, main entry lobbies, corridors,
restrooms, and support functions are treated as separate areas.
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 84
Photo Credit:
Philips
SECTION 5
TABLE 146-F FOOTNOTES
1. The smallest of the following values may be added to the allowed lighting power for ornamental chandeliers and
sconces that are in addition to and switched or dimmed on circuits different from the circuits for general lighting:
• One watt per square foot times the area of the task space that the chandelier or sconce is in; or
• The actual design wattage of the chandelier or sconce.
2. The smallest of the following values may be added to the allowed lighting power for specialized task work:
• 0.5 watt per square foot times the area of the task space required for an art, craft assembly or manufacturing operation; or
• The actual design wattage of the luminaire(s) providing illuminance to the specialized task area. For spaces employing this
allowance, the plans shall clearly identify all task spaces using these tasks and the lighting equipment designed to illuminate
these tasks. Tasks that are performed less than two hours per day or poor quality tasks that can be improved are not eligible
for this specialized task work allowance.
3. The smallest of the following values may be added to the allowed power for precision commercial and industrial work:
• One watt per square foot times the area of the task space required for the precision work; or
• The actual design wattage of the luminaire(s) providing the illuminance to the precision task area. For spaces employing this
allowance, the plans shall clearly identify all task spaces using these tasks and the lighting equipment designed to illuminate
these tasks. Tasks that are performed less than two hours per day or poor quality tasks that can be improved are not eligible
for this precision task work allowance.
4. The smallest of the following values may be added to the allowed lighting power for specialized task work:
• 0.2 watt per square foot times the area of the task space required for a lab in a school; or
• The actual design wattage of the luminaire(s) providing illuminance to the specialized task area.
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 85
SECTION 5
ACTUAL LPD: REDUCTION THROUGH CONTROLS
( Controlled W ) X ( PAF from the table 146-C ) = LPD reduction
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 86
Creative Commons, Photo Credit: Noway
SECTION 5
TABLE 146-C: LIGHTING POWER ADJUSTMENT FACTORS
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 87
Can be found:
(Page 119) 2008 Building
Energy Efficiency Standards
SECTION 5
ACTUAL LPD: REDUCTION THROUGH CONTROLS
In order to use the LPD reductions from TABLE 146-C,
the following requirements must be met:
• The control must comply with mandatory requirements
• At least 50% of the light output must be within the applicable
space listed in TABLE 146-C
• Only one Power Adjustment Factor is used for the luminaire
(except where noted otherwise in TABLE 146-C)
• The multi-level occupancy sensor must meet all multi-level
and uniformity requirements.
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 88
SECTION 5
ACTUAL LPD: LIGHTING WATTAGE EXCLUDED
Wattage of many lighting applications may be excluded:
• Theme Parks: Lighting for themes and special effects
• Studio lighting for film or photography and for a videoconferencing studio
• Lighting for dance floors, theatrical and other live performances
• Equipment that is for sale and for demonstration
• Temporary exhibits in civic facilities, transportation facilities, convention
centers and hotel function areas
• Lighting installed by the manufacturer in refrigerated cases, walk-in
freezers, vending machines, food preparation equipment and scientific
and industrial equipment
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 89
Photo Credit: Philips Photo Credit: Philips Photo Credit: Philips
SECTION 5
ACTUAL LPD: LIGHTING WATTAGE EXCLUDED
Also, lighting for:
• Plant growth or maintenance
• Required exit signs
• Guestrooms in hotel / motel
• Temporary lighting systems
• Parking garages for 7 or less vehicles
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 90
Photo Credit: Martin Pettitt
EXERCISE:
CHARMED BOUTIQUE
AREA CATEGORY: RETAIL MOCKUP
1. Calculate installed lighting wattage
2. Calculate control credit watts
3. Calculate the allowed general lighting power
4. Verify installed lighting wattage is within allowed parameters
SECTION 5
AREA CATEGORY: RETAIL MOCKUP
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 92
SECTION 5 7/29/2013 PRESCRIPTIVE APPROACH SLIDE 93
TOTAL: 1,021 INSTALLED WATTS
(Page 2 of T24 EnergyPro printout)
INSTALLED LIGHTING WATTAGE
SECTION 5
TABLE 146-C: LIGHTING POWER ADJUSTMENT FACTORS
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 94
Can be found:
(Page 119) 2008 Building Energy
Efficiency Standards
SECTION 5
CONTROL CREDIT
Storage area: 2 controlled luminaires
Wattage of control lighting X PAF (Table 146-C) = W, control credit
124 W of Control Lighting X [0.15 PAF] = 19 W, control credit
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 95
(Page 4-5 of T24 EnergyPro printout)
SECTION 5
TABLE 146-F: DETERMINING ILLUMINANCE CATEGORY
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 96
Can be found:
(Page 121) 2008 Building Energy
Efficiency Standards
SECTION 5
DETERMINING ILLUMINANCE CATEGORY
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 97
Retail Sales, Wholesale:
1.60 W / ft2
Commercial,
Industrial
Storage:
0.60 W / ft2
(Page 6 of T24 EnergyPro printout)
SECTION 5
CALCULATING ROOM SIZE
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 98
Sales Floor:
595 ft2
Storage:
170 ft2
(Page 6 of T24 EnergyPro printout)
SECTION 5
CALCULATING ALLOWED LIGHTING POWER
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 99
595 ft2 x 1.60 = 952 W allowed
170 ft2 x 0.60
= 102 W allowed
TOTAL: 1,054 W ALLOWED
(Page 6 of T24 EnergyPro printout)
SECTION 5
DOES IT COMPLY?
Installed Lighting: 1,021 W
– Lighting Control Credit: 19 W
= Adjusted Installed Lighting Power: 1,002 W
Allowed Lighting Power: 1,054 W
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 100
Complies!
SECTION 5
ALLOWED LPD: TAILORED METHOD
The Tailored Method is calculated
according to primary function
type as permitted in column 1 of
TABLE 146-G. (Please refer to the handout.)
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 101
Can be found:
(Page 122) 2008 Building Energy
Efficiency Standards
SECTION 5
ALLOWED LPD: TAILORED METHOD, STEP 1
If a specific IESNA Illuminance Category is listed in Column 2 of TABLE 146-G,
then that category must be used.
Otherwise, determine the illuminance category for each lighting primary function
type according to categories specified in the IESNA Lighting Handbook using the
“Design Guide” for illuminance.
1. Determine the area of each primary function
2. Determine the room cavity ratio (RCR) for each primary function area
3. Multiply the area of each primary function by the allowed lighting power density for the
illuminance category and RCR for each primary function area according to TABLE 146-I.
4. The product or the actual installed lighting power for the primary function, whichever is
less, is the allowed general lighting power for the space.
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 102
Note: The general allowed lighting change when using the Tailored Method, from the
average lighting requirement for a retail sales space (AC allowance), to an allotment
based on specific spacial requirements (actual RCR) and IES illuminance categories.
SECTION 5
ALLOWED LPD: TAILORED METHOD, STEP 2
Four types of Tailored Method allowances: wall, floor, very valuable
merchandise, and ornamental displays
Determine additional allowed power for display and decorative lighting
(columns 3-5 of TABLE 146-G)
• Displays installed against a wall do not qualify for floor display lighting power allowances.
• Floor displays do not qualify for the wall display allowances.
In retail merchandise sales, museum, and religious worship,
the smallest of the following separate lighting power for display cases
presenting very valuable display items is permitted:
• The product of the area of the primary function and 1.0 W / ft2; or
• The product of the area of the display case and 16 W / ft2, or
• The actual power of lighting for very valuable displays.
Only the general portion of the lighting power may be used for tradeoffs.
Display and decorative lighting power allowances are “use it or lose it.”
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 103
EXERCISE:
CHARMED BOUTIQUE TAILORED METHOD: RETAIL MOCKUP
Very valuable merchandise displays: business is changing
center merchandise tables to jewelry cases
SECTION 5
FLOOR PLAN CHANGES
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 105
SECTION 5
LUMINAIRE CHANGES
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 106
SECTION 5
TABLE 146-C: LIGHTING POWER ADJUSTMENT FACTORS
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 107
Can be found:
(Page 119) 2008 Building Energy
Efficiency Standards
SECTION 5
TABLE 146-F DETERMINING ILLUMINANCE CATEGORY
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 108
Can be found:
(Page 121) 2008 Building Energy
Efficiency Standards
SECTION 5
TABLE 146-G
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 109
Can be found:
(Page 122) 2008 Building
Energy Efficiency Standards
SECTION 5
TABLE 146-G Continued
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 110
SECTION 5
TABLE 146-I
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 111
Can be found:
(Page 123) 2008 Building
Energy Efficiency
Standards
SECTION 5
GENERAL SALES FLOOR
• Primary Function Type (Table 146-G, col 1)
• Illuminance Category (Table 146-G, col 2)
• Floor Area for Primary Function =
(Length) x (Width)
• Room Cavity Ratio =
5 x (H) x (Length + Width) / (Length x Width)
• Allowed LPD (Table 146-I)
• Allowed W = Area x Allowed LPD
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 112
Primary Function Type
F GC D EB
Illuminance
Category
Room
Cavity
Ratio
Retail Sales, Wholesale D 4.15 595 1.20 714
Floor Area for
Primary FuntionAllowed LPD
Allowed W (E x F)
Retail Sales, Wholesale
D
35 ft x 17 ft = 595 ft
5 x 9.5 x (52) / (595) = 4.15
1.2 W
714 W
SECTION 5
• In retail merchandise sales, museum, and religious worship, the smallest of the
following is permitted for display cases presenting very valuable merchandise :
(See §146(c)3B(iv)(a))
1. The product of the area of the primary function and 1.0 W / ft2; or
2. The product of the area of the display case and 16 W / ft2, or
3. The actual power of lighting for very valuable displays.
• Area Wattage = (Floor Area) x (Valuable Display Power)
595 x 1.00 = 595
• Display Case Wattage = (Display Case Area) x (W / ft2)
24 x 16 = 384
• Design Wattage = (# of lm) x (W/lm)
6 x 54 = 324
HIGH VALUE DISPLAYS
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 113
SECTION 5
CALCULATING ALLOWED LIGHTING POWER
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 114
General Sales: 714 W allowed
Very Valuable Displays: 324 W allowed
Total: 1038 W allowed
Storage Area
170 ft2 x 0.60
= 102 W allowed
TOTAL: 1,140W ALLOWED
SECTION 5
PUTTING IT ALL TOGETHER
Allowed lighting power
• General sales floor lighting: 714 W
• High value merchandise displays: 324 W
• Storage area: 102 W
(same as area category method calculation)
TOTAL: 1,140 W
Installed lighting power
• Installed lighting: 1093 W
• Lighting control credit:19 W
(same as area category method calculation)
TOTAL: 1,074 W
7/29/2013 PRESCRIPTIVE APPROACH SLIDE 115
Complies!