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LAMP LIFE (hr)
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CHARACTERISTICS OF TYPICAL LAMPS
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TABLE 8-1
CHARACTERISTICS OF TYPICAL LAMPS (CONTINUED) PAR, R, AND ER LAMPS
BULB DESCRIPTION
WATTS
LAMP LIFE (hr)
INITIAL LUMENS
PAR-38 Spot/Flood ER-30 ER-30 ER-30 ER-40
150 50 75 90 120
2000 2000 2000 5000 2000
1730 525 850 950 1475
TUNGSTEN-HALOGEN (QUARTZ-IODINE) LAMPS BULB DESCRIPTION WATTS LAMP LIFE (hr) COLOR TEMP (K) INITIAL LUMENS
PAR-38 PAR-38 PAR-38 T-4 T-4 T-4
50 90 250 100 150 250
2000 2500 6000 1000 1500 2000 3000 2950
590 1260 3500 1800 2900 5000
STANDARD FLUORESCENT LAMPS BULB DESCRIPTION WATTS LENGTH/ SIZE (in) LAMP LIFE (hr) COLOR TEMP (K) INITIAL LUMENS
F40T12CW/RS F40T12WW/RS F40T12CWX/RS F40T12WW/RS F40T12D/RS F40T12W/RS F96T12CW F96T12WW F9612CWX F9612WWX
40 40 40 40 40 40 75 75 75 75
20,000 20,000 20,000 20,000 20,000 20,000 12,000 12,000 12,000 12,000
4300 3100 4100 3000 6500 3600 4300 3100 4100 3000
3150 3170 2200 2170 2600 3180 6300 6335 4465 4365
48 48 48 48 48 48 96 96 96 96
MERCURY-VAPOR (MV) LAMPS BULB DESCRIPTION WATTS LAMP LIFE (hr) INITIAL LUMENS
H45AY-40/50 DX H43AY-75/DX H38BP-100/DX
50 75 100
16,000 24,000 24,000
1680 3000 2865
TLFeBOOK
LIGHTING, LAMPS, AND LUMINAIRES
TABLE 8-1
CHARACTERISTICS OF TYPICAL LAMPS (CONTINUED) MERCURY-VAPOR (MV) LAMPS
BULB DESCRIPTION
WATTS
LAMP LIFE (hr)
INITIAL LUMENS
H38JA-100/WDX H38MP-100/DX H39BN-175/DX H39KC-175/DX H37KC-250/DX
100 100 175 175 250
24,000 24,000 24,000 24,000 24,000
4000 4275 5800 8600 12,775
METAL-HALIDE (MH) LAMPS BULB DESCRIPTION WATTS LAMP LIFE (hr) COLOR TEMP (K) INITIAL LUMENS
M57PF-175 M58PH-250 M59PK-400
175 250 400
7500 10,000 1500
14,000 20,500
34,000
HIGH-PRESSURE SODIUM (HPS) LAMPS BULB DESCRIPTION WATTS COLOR TEMP (K) INITIAL LUMENS
S68MTR-50 S54MC-100 S55MD-150
50 100 150
24,000 24,000 24,000
3800 8800 15,000
Residential Lighting Design
Good lighting design provides a suitable brightness pattern for each room based on the recommended average footcandles of incident light on the floor of the room to be illuminated The principal factors to be considered for satisfactory room lighting are the following
I I I I
Room dimensions: ceiling height and floor area Architectural or structural features that can affect lighting Reflectance, diffusion, and absorption of light by ceilings, walls, floor, and furnishings Proper selection of luminaires by evaluating their light distribution, efficiency, decorative value, elimination of glare, and economy I Height and spacing of luminaires within rooms based on room function Luminaires, receptacles, and switches should be distributed among many branch circuits in homes or offices to provide alternative light sources if one branch is disabled by a short circuit or overvoltage Enough light should be available from alternative
TLFeBOOK
RESIDENTIAL LIGHTING DESIGN
sources in the same or adjacent rooms to permit the occupant or occupants to correct any obvious faults in the disabled branch circuit and still reach the loadcenter safely to restore power Lighting design includes the estimation of lighting loads as well as the power requirements of all major appliances and building services Because of the variables in these estimates, the lighting loads should be slightly overestimated to provide excess capacity for safety reasons As a rule of thumb, it is recommended that no branch circuit be loaded for more than 80 percent of its capacity The total ampacity in volt-amperes for 15-A lighting circuits is 15 A 120 V AC 1800 VA Thus, if the 80 percent rule is followed, the maximum initial connected load should not exceed 1440 VA Luminaires should be selected that provide the highest comfort level and performance appropriate for the room being lighted This information is conveyed to builders and electrical contractors by drawings, schedules, notes, and specifications Figure 8-12 is a scale drawing of a lighting plan for a home It shows the location of permanent ceiling luminaires (indicated by the cross-in-circle symbols), and their wiring to switches as indicated by curved dotted lines This floor plan also shows the approximate locations of receptacles and other electrical devices, and gives branchcircuit ratings The locations of lighting fixture symbols on floor plans, keyed with a luminaire schedule or written specifications, gives the electrical contractor enough information to bid successfully on the electrical work In addition to the contract documents that also guide the contractor, luminaire manufacturers typically provide specific instructions on the shipping cartons for installing their products A luminaire schedule is an important specifications document that identifies the graphic symbols used to designate the positions of each permanently installed luminaire specified It also identifies the manufacturer and gives the catalog number, operating voltage, and mounting method: surface-mounted, recessed, or wall-mounted An architect or electrical contractor might prepare separate detail drawings of unusual or custom-made luminaires designed specifically for a home or office These drawings will save time in the estimation process and make it easier and less time-consuming for the electrician in the field to install the luminaire the way it is intended Permanently installed luminaires such as ceiling domes, wall sconces, and track and recessed lighting can provide enough general illumination for normal movement about the room and the performance of routine tasks The presence or absence of natural lighting from windows or skylight must be factored into the design However, the illumination level from either ceiling luminaires or natural light is usually insufficient for activities such as reading or writing This light can be supplemented by table, floor, and desk lamps Lighting design is not a completely scientific process because it involves human perception, tastes, and moods Satisfactory lighting for children and youth might not be acceptable for seniors because of differences in their visual acuity In addition, the colors and textures of floors, walls, and ceilings affect the selection of appropriate luminaires
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