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Socket
Bracket

Lamps (2)
(By Others)

Vented
Top

Alzak
Reflector

Venting
Slot

Rail
Support (2)

P634

DATE:

PROJECT:

TYPE:

Wide Beam Downlight
Two 26W Quad Tube Lamps
71/4" Round Apertures

Cone Retaining
Vertical
Adjustment Spring

Prism Lens Specular
Aperture Safety
(Optional)
Alzak Cone Frame Chain

Optics and Applications
The primary reflector maximizes the output of two energy
efficient quad tube lamps. The parabolic shielding cone
offers low brightness visual comfort from all normal viewing
angles. Use in entries, corridors, transient spaces, and for
task lighting in low to medium height ceilings.

Design Features
Construction allows easy access to all components.
Efficient air flow design and extensive heat testing assure
cool fixture temperature for optimal lamp performance.
Steel housing protects the reflector and assures the proper
relationship for maximum performance. Maximum ceiling
thickness 2". Ballast and lamp service from below.

Finish
Specular clear Alzak cones are standard. Optional
colors and Softglow® finishes are available. Housings
and structural parts are painted optical matte black to
suppress stray light leaks. Steel parts are phosphate
conditioned for corrosion resistance before painting.

Ballasts
Fully electronic, microprocessor controlled with variable
starting current for inrush protection to assure rated lamp
life. Input voltage range from 120V through 277V. Power
factor .98, starting temperature 0°F (-18°C), THD < 10%.
Pre-heat start < 1.0 second. End of lamp life protection.
Rated for > 50,000 starts.

Dimensions and Lamps

D
A

C

B

Number

A
Depth

B
Aperture

C
Width

D
Length*

Lamps

P634

6 1/2"
165mm

7 1/4"
184mm

13 1/2"
343mm

19"
483mm

Two 26W
Quad Tube

*Length increases to 24" with EM accessory.

Rev1 Date 2/26/2016

General
Fixtures are pre-wired, UL and C-UL listed for eight wire
75°C branch circuit wiring. All products are union made.
Designed and manufactured in the USA.
Warranty
5 Year Warranty. See www.kurtversen.com for details
or select hyperlink.

Accessories
G
Gold cone.
WT White cone flange.
W
Wheat cone.
WHT White complete cone.
DCE Double circuiting.
Y
Pewter cone.
V347 347 volt ballast.
R2 26" support rails.
R5 52" support rails.
LS Lamp shield, acrylic.
FLC7 Full lens cone 7".
LP Prism lens, acrylic.
F
Fuse.
S
Softglow ® add S to color, e.g.SC Softglow® clear.
DM Dimming ballast. Specify watts and volts.
DME ECO Lutron. Specify watts and volts.
DMX 7% Advance Mark X. Specify watts and volts.
EM Emergency power includes integral charger light and
test switch visible through aperture. Single lamp
operation for 90 minutes. Specify volts.

©2016 Kurt Versen, a division of Hubbell Lighting, Inc. Because of continuing product improvement programs, Kurt Versen reserves the right
to change specifications without notice. One Paragon Drive, Suite 157, Montvale, NJ 07645 / Tel 201.664.8200 / Website www.kurtversen.com

P634

Cut out dimensions: 7 9/16". Outer flange dimension: 13 1/8".

Performance Datachart

Single Unit Initial Footcandles, 30" Work Plane

Ceiling to Floor

P634 Two 26W Quad Tube lamps Read Bottom Data
Nadir
FC

FC

23

23

32

15°

32

17

Diam

FC

3'

17

3'

17

11

4'

11

7

7

5'

See notes 4, 5 and 6.

6'

24

25°

Diam

FC

6'

12

13
8
6

5'

9'

Candlepower Distribution
110

660
770
880
1100

5°

15°

90°

25°

Notes

24

20

13

4

16'

14'

16'

0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90

0°

3600*
980
971
982
995
912
924
909
800
592
364
175
65
19
5
0
0
0
0
0

90°

3600*
980
1033
1091
1145
1145
1037
950
942
811
503
284
132
34
9
0
0
0
0
0

1 Data on all charts calculated with a clear specular cone finish.
2 Specular cone multipliers: Wheat x .97, Pewter x .88, Black x .50.

3 Softglow® cone multipliers: Clear x .97, Wheat x .87, Pewter x .73.
4 Single unit Datachart pattern diameters are determined by the number
of degrees from each side of nadir. Therefore a 15° diameter
represents a total 30° pattern width at the work plane 30" above the
floor. Footcandle values are at the edge of that diameter.

5 Datachart spacing is rounded off to the nearest foot.
6 Data by IES methods. Compact fluorescent data vary due to lamp
lumen differences, power input, burning position, ambient temperature
and ballast characteristics. A modification factor should be applied.
7 Brightness data from the Average Luminance Method are inaccurate
for small aperture downlights. They are theoretical calculations derived
for large surfaces such as troffers.

34

Floor 20%

11

Ceiling

80%

19

15

10

7

4

10

8

Coefficients of Utilization
Wall %

29

18

13'

12'

Vertical Angles
° Initial
Lamp Lumens

*

8'

9'

13'

°

P634 Two 26W Quad Tube lamps
Eff. 52% S/M 0° 1.3 S/M 90° 1.4

9'

11'

35°

0°

RCR 8

10'

45°

550

RCR 3

11'

55°

440

RCR 1

9

9'

65°

330

Spacing

8'

Candelas

85°

Walls 50%

8'

75°

220

990

Diam

5

11'

Ceiling 80%

Spacing is Maximum Over Work Plane

35°

16

7'

Multiple Units Initial Footcandles, 30" Work Plane

70%

6

50%

30%

0

70

50

30

10

50

10

50

10

50

10

0

1

.58

.56

.55

.53

.55

.53

.53

.51

.51

.49

.47

3

.51

.47

.44

.41

.46

.41

.45

.40

.43

.40

.38

RCR
2
4
5
6
7
8
9

10

Zonal Cavity Method - Floor Reflectance 20%

.54
.48
.44
.42
.39
.36
.34
.32

.51
.43
.39
.36
.33
.31
.28
.26

.49
.39
.36
.32
.29
.27
.25
.23

.47
.37
.33
.30
.27
.24
.22
.20

.50
.42
.39
.36
.33
.30
.28
.26

P634 Two 26W Quad Tube lamps

Corridor Footcandles

.46
.37
.33
.30
.27
.24
.22
.20

.49

.45

.41

.36

.38

.33

.35

.29

.32

.27

.30

.24

.27

.22

.26

.20

.47
.40
.37
.34
.31
.29
.27
.25

.44
.36
.32
.29
.26
.24
.22
.20

.42
.34
.31
.28
.25
.23
.21

.19

P634 Two 26W Quad Tube lamps Read Bottom Data

Reflectances: Ceiling 80%
Ceiling
Height 8' Centers
C/L 2'
4'
6' C/L
28 31 29 31 28
8'
9'

10'

26
24

27
24

27
25

27
24

26
24

Walls 50% Floor 20%

12' Centers
C/L 2'
4'
21

22

18

18

18

8'

10' C/L
22

21

15

17

17

16

17

17

15

17

18

18

6'

17

Initial footcandles. Readings on the floor. 5' corridor width.

One Paragon Drive, Suite 157, Montvale, NJ 07645 / Tel 201.664.8200 / Website www.kurtversen.com
©2016 Kurt Versen, a division of Hubbell Lighting, Inc. / P634 / Rev1 Date 2/26/2016

Because of continuing product improvement programs, Kurt Versen reserves the right to change specifications without notice.

18

18

17



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