Lightolier 340 User Manual

LOUVER CONFIGURATION DIMENSIONS

24" (610mm)

5-1/2"

(140mm)

48" (1219mm)

2"

(51mm)

1-7/32"
(31mm)

20"

(508mm)

24"

(610mm)

5-7/8"

(149mm)

4"

(102mm)

9/32" mounting hole

3/16" x 5/8" K.O.

7/8" dia. K.O. within
1-7/8" dia. K.O.

78 Cell

PARABAFFLE (MLB) MLB SERIES 240/340/440

Page 1 of 2 2'x4' SURFACE BOX FLUORESCENT, 1 1/2" DEEP, 78 CELL PARABOLIC LOUVER

2, 3, or 4 LAMP T8/T12

Job Information Type:

Job Name:

Cat. No.:

Lamp(s):

Volts/Ballast:

Lightolier a Genlyte Thomas Company www.lightolier.com

Technical Information: [phone] • Fax [phone]
631 Airport Road, Fall River, MA 02720 • [phone] • Fax [phone]
We reserve the right to change details of design, materials and finish.
© 2002 Genlyte Thomas Group LLC (Lightolier Division)
A0902 SECTION 2/Folio G20-38

FEATURES

• Only 5 1/2" deep.

• 20 gauge steel welded body.

• Efficiency 61.7% (3 lamp T8).

• 1.6 spacing mounting ratio (3 lamp T8).

• Side mounted ballast for cooler operation.

• 45° mitered corners (body and louver).

• 1 1/2" deep, 3 1/2" x 3 1/2" cell aluminum parabolic louver.

• Spring-loaded latches.

• Perfectly uniform four side reveal.

• Low-iridescence, semi-specular aluminum louver, standard.

• Vertical grain on louver eliminates reflected lamp images on cross
baffle.

• Louver has polyethylene dust guard.

• Flush end K.O.s for smooth surface (at end of row or individual).

• Matches parabaffle 2'x4' recessed.

• Meets NYC Code requirements.

• Louver assembly can be replaced with any of 3 standard Lightolier
door frames.

PHOTOMETRY MODEL NO. MLB2S78LS340120O3

coefficients of utilization — zonal cavity method

RF 20 20 20
RC 80 50 30

RW 70 50 30 50 30 10 50 30 10

1696765 636160 605958
2646057 575553 555351
3605450 524946 504745
4554944 474340 454239
5514439 423835 413734
6463934 373330 363330
7433530 342926 332926
8393126 302622 292522
9362823 272219 262219

10 33 25 20 24 20 17 23 20 17

visual comfort probability

room size ceiling height ceiling height
W L 8.5 10.0 13.0 16.0 8.5 10.0 13.0 16.0
20 20 81 79 73 81 80 74 65 74

20 30 81 79 78 75 78 75 72 67
20 40 81 79 78 79 78 75 72 70
20 60 82 79 78 79 78 75 73 68

30 20 81 82 73 77 78 78 68 72
30 30 81 82 77 73 78 79 74 67
30 40 81 82 77 76 78 79 75 67
30 60 82 83 77 74 78 79 75 68
30 80 82 83 77 75 78 79 75 68

40 20 81 82 76 77 78 78 70 73
40 30 81 82 79 73 78 79 76 69
40 40 82 83 79 74 78 79 76 69
40 60 82 83 79 74 78 79 75 69
40 80 82 83 79 74 78 79 75 69
40 100 82 83 79 75 79 79 75 69

60 30 81 83 79 74 78 79 76 72
60 40 82 83 79 75 78 79 75 72
60 60 82 83 79 76 79 79 75 72
60 80 82 83 79 76 79 79 75 72
60 100 82 83 79 76 79 79 75 72

100 40 82 83 79 76 79 79 75 72
100 60 82 83 79 76 79 79 75 72
100 80 82 83 79 76 79 79 75 72
100 100 82 83 79 76 79 79 75 72

room cavity ratio

luminaries lengthwise

luminaries crosswise

ORDERING INFORMATION

Explanation of Catalog Number. Example: MLB2S78LS340120O3GLR

ML

PARABAFFLE

PARABOLIC:

1 1/2" Deep

Precision

Contoured Pre-

anodized

Aluminum

Louver

B

BODY STYLE:

Surface Box

2

FIXTURE

WIDTH

S

CEILING

TYPE:

S=Surface

78

NUMBER OF

CELLS

L

LOUVER FINISH*:

L=Low-iridescence

semi-specular
(standard)

P=Low-iridescence

specular

S

WHITE

REFLECTOR

LAMP

QUANTITY:

2, 3 or 4 Lamps

40

LAMP/
FIXTURE
LENGTH:

(Nominal 48")

VOLTAGE:

120 or 277

BALLAST TYPE:
LE=Magnetic (T12)
OC=Magnetic (T8)
SS=Electronic (T12)
S3=1-3 Lamp Elec. (T12)
SO=Electronic (T8)
O3=1-3 Lamp Elec. (T8)
O4=1-4 Lamp Elec. (T8)
DIM=Dimming (T12)
PS=LOL Power Spec

T8 Dimming

Ballast

OPTIONS:

Add
appro­priate

suffix to

catalog
no., ie:

(GLR)

OPTIONS & ACCESSORIES

FUSING: Internal fast-blow fusing. SUFFIX: GLR.

Internal slow-blow fusing. SUFFIX: GMF.
RADIO INTERFERENCE FILTER: 120 or 277 volt, 50 or 60 Hz. One per fixture
is standard. SUFFIX: RF.
ELECTRICAL/WIRING OPTIONS: Consult factory.
LOW DENSITY CEILINGS: DSM
STEM AND CANOPY SETS: Suspends fixture 6", 12", 18" or 24" from surface
(four per fixture is recommended). Catalog Number ASC6 CSP (6"),
ASC12 CSP (12"), ASC18 CSP (18"), ASC24 CSP (24").

SPECIFICATIONS

PERFORMANCE: In an installation of 3 lamp 32W luminaires in a room cavity

ratio of 1, with a reflectance of 80% ceiling, 50% wall, 20% floor, the C.U.
shall not be less than .67. To prevent glare the VCP shall be not less than 79
either lengthwise or cross wise (at 100fc level) and the average brightness at
65° shall not exceed 97 footlamberts. To control veiling reflections, luminaire
output in the 30°-90° zone shall be not less than 69.3%.

SPECIFICATIONS (continued)

MATERIALS: Chassis parts are die-formed 20 gauge cold rolled steel, weld-

ed for rigidity.

LOUVER: pre-anodized aluminum (Coilzak® or equal).
FINISH: Louver—low iridescence, semi-specular pre-anodized vertical grain

reflector sheet. Cavity—white baked acrylic enamel minimum 86%
reflectance. Phosphate undercoating. Chassis exterior—white baked acrylic
enamel.
ELECTRICAL: Thermally protected class “P” ballast C.B.M. approved, non PCB.
If K.O. is within 3" of ballast, use wire suitable for at least 90°.
LABELS: I.B.E.W., UL, ULc Listed.

*Consult factory for availability of louver finishes.

MLB2S78LS340120SO

F32T8

2850

Lightolier a Genlyte Thomas Company www.lightolier.com

Technical Information: [phone] • Fax [phone]
631 Airport Road, Fall River, MA 02720 • [phone] • Fax [phone]
We reserve the right to change details of design, materials and finish.
© 2002 Genlyte Thomas Group LLC (Lightolier Division)
A0902 SECTION 2/Folio G20-38

Job Information Type:

PARABAFFLE (MLB) MLB SERIES 240/340/440

Page 2 of 2 2'x4' SURFACE BOX FLUORESCENT, 1 1/2" DEEP, 78 CELL PARABOLIC LOUVER

2, 3, or 4 LAMP T8/T12