Cooper Lighting Vision Flood 用户手册
4
V I S I O N F L O O D
A r c h i t e c t u r a l F l o o d L u m i n a i r e
NEMA Beam
Field Angle
Description +
Classification
Range
Setback
1
10-18
°
Narrowest Beam, Long Setback
2
18-29
°
Narrow Beam, Long Setback
3
29-46
°
Narrow Beam, Long Setback
4
46-70
°
Medium Beam, Medium Setback
5
70-100
°
Medium Beam, Medium Setback
6
100-130
°
Wide Beam, Shorter Setback
7
130
°-Greater
Widest Beam, Short Setback
- Floodlighting Terminology
- NEMA [IES] Classifications
- NEMA [IES] Classifications
F L O O D L I G H T I N G T E R M I N O L O G Y
N E M A [ I E S ] C L A S S I F I C A T I O N S
NEMA classifications are extrapolated from the table below and are determined by a distribution’s Field Angle. This relative classification is used
to describe the general shape and application of a distribution. NEMA classifications are used to classify both the horizontal and vertical
components of a floodlight distribution.
The example distribution in FIG. 1 above would have a NEMA Classification of 6 as the 120° Field Angle falls between the 100-130° range.
F L O O D L I G H T I N G T E R M I N O L O G Y
Ever wonder how NEMA (H x V) Classifications are derived, or how they relate
to the performance and design application of a floodlighting distribution?
How about beam and field angles, and maximum candela values?
- Maximum Candela is defined as the maximum candela value emitted
from the luminaire in any given direction.
- Beam angle is defined as the included angle between points of 50%
of Maximum Candela.
- Field Angle is defined as the included angle between points of 10%
of Maximum Candela.
As an example, a distribution with a 50,000 Cd maximum candela value
as shown in the intensity distribution graph to the right (FIG. 1) would have a
Beam Angle defined by the included angle of 25,000 Cd values, and a Field
Angle defined by the included angle of 5,000 Cd values.
E X A M P L E
Max Candela = 50,000 Cd
Candela Value defining Beam Angle = (50% * 50,000 Cd) = 25,000 Cd
Candela Value defining Field Angle = (10% * 50,000 Cd) = 5,000 Cd
Beam Angle = 90°
Field Angle = 120°
90
°
60
°
80
°
70
°
50
°
40
°
30
°
45
°
0
°
Beam Angle
10,000 cd
15,000 cd
20,000 cd
25,000 cd
30,000 cd
35,000 cd
40,000 cd
45,000 cd
50,000 cd
5,000 cd
Field Angle
90
°
60
°
80
°
70
°
50
°
40
°
30
°
45
°
20
°
10
°
20
°
10
°
FIG. 1
VISION_FLOOD.wpc 11/19/03 6:20 PM Page 5