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B i - l e v e l H I D C o n t r o l s
B i - level HID Lighting Contro l
Design and Application Guide
DMAPPS_1204
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Design guide intro d u c t i o n
W h i le High Intensity Discharge (HID) lighting is a popular lighting choice, these lights
a re often left on co n t i n u a l l y due to the lengthy re s t r i k e periods. Now, mandatory energ y
codes are making co n t rol of HID lighting just as critical as co n t rolling any other type of
lighting. Watt Sto p p e r ’s DM b i - l evel co n t r ols make effe c t i v e HID co n t rol poss i b le by
s w i t ching lights from high to low.
Realizing the full potential of co n t rolling HID lights re q u i r es ca r eful co n s i d e ration of a
number of fa c to rs. This guide discusses each of these fa c to rs in addition to ex a m i n i n g
four specific HID co n t rol applica t i o n s .
In this guide you’ll find deta i led steps fo r
designing an HID co n t r ol application using
DM module s :
1 . S e l ecting the appro p r i a te DM module fo r
the applica t i o n
2 . C o n t rol method and dev i c e sele c t i o n
3 . C o n t rol appro a c h e s
4 . Wiring and insta l l a t i o n
A p p l i c ation ex a m p les for specific building space s
Watt Sto p p e r / L e g ra n d ’s application experts are ava i l a b l e for design support and ass i s -
ta n ce on any lighting co n t r ol question. Call our te c h n i c al support at 8 0 0 - 8 7 9 - 8 5 8 5 .
T h e r e are three diffe r ent DM products in Watt Sto p p e r ’s line of bi-level HID co n t r o l s .
Each is designed for diffe rent applications.
• DM-100 for re t rofitting ex i sting HID fixture s
• DM-105 for new fixtures or installation by fixture
m a n u f a c t u re rs
• DM-105-WP for outdoor use
I n t r oduction
S t ep 1 - Select appro p r i a t e DM module
S e l ecting the DM
m o d u le
B i - l e v e l H I D C o n t r o l s
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B i - l e v e l H I D C o n t r o l s
T h e r e are many diffe rent co n t rol dev i c es to choose from to signal the DM modules fo r
HID co n t rol: occupancy sensors, photo c ells, time switches, or lighting co n t r ol panels.
M o re o ver, these products can be combined to achieve customized co n t rol of a particular
fa c i l i t y.
• I n te r m i t te n t l y used spaces benefit from installations that team the DM with occ u-
pancy sensors.
• With photo cells, designers can maximize use of natural light by combining it with
other co n t rol dev i c es to signal the DM modules.
• Time switches like the TS-400 enable users to cre a t e co n s i s tent HID co n t rol thro u g h-
out a wo r k s p a c e.
• Lighting co n t r ol panels provide ce n t ralized co n t rol for facilities that are best suite d
for this type of co n t ro l .
For additional guidelines on selecting the optimal co n t rol dev i c e, re f er to the pro d u c t
specific design and application guides in this binder.
C o n t rol inputs
Combining co n t r ol dev i ces is simple with DM
m o d u l es via the dual co n t rol inputs. These allow
i n s ta l le rs to connect the dev i ce to multiple co n-
t rol dev i c es simulta n e o u s l y.
S t ep 2 - Choosing co n t rol method and dev i ce
Inputs # 3 and 4 on the DM port enable
designers to connect a single DM or a
series of DMs to different control devices,
such as a photocell and time switch.
S e lecting co n t ro l
m e t h o d
Occupancy sensors
Photocells
Time switches
Lighting control panels
Outdoor motion sensor
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B i - l e v e l H I D C o n t r o l s
S t ep 2 - Choosing co n t rol method and dev i ce
S e lecting co n t ro l
d e v i ce s
I m p o r tant fa c to rs to consider when identifying the appro p r i a te co n t rol product for an HID
lighting system include:
• D e v i c e mounting height
• Traffic patte r n s
• Ambient light levels
• F i x t u r e lo ca t i o n s
C o n t rol dev i c e mounting height
The height at which the co n t r olling dev i c e can be mounted is important. For insta n c e ,
some HID systems are insta l l ed in facilities with ceiling heights exceeding 15 feet. Since
this mounting height would diminish the effe c t i v e n e ss of ce r tain occupancy sensors (such
as ultrasonic sensors), a PIR sensor (such as the CI-300 or CX-100, which can be
m o u n ted at heights up to 40 feet) or a diffe rent co n t r ol product altogether (such as a
lighting co n t r ol panel or photo cell) should be chosen.
O c cupant traffic patte r n s
The ways in which occupants move through a space also may influence the selection of
the lighting co n t rol dev i c e to signal the DM co n t ro l l e r s. For insta n c e, in a ware h o u s e ,
o c cupants may use a main aisle fre q u e n t ly and side aisles only occa s i o n a l l y. In this ca s e ,
s e l ecting occupancy sensors to co n t rol zones based on occupancy will be a more effe c t i v e
co n t r ol method than co n t rolling the entire space ’s lighting co l l e c t i v e ly with a lighting co n-
t rol panel.
Ambient light leve l s
S o u rces of natural light, such as skylights, windows, and open loading docks offer the
opportunity to supplement or re p l a ce artificial HID lighting during daylight hours in ce r-
tain areas. Designers can ta k e adva n t age of this by supplementing a primary co n t ro l
method, such as time scheduled co n t rol, with daylight re s p o n s i v e co n t rol via photo c e l l .
P h o to cells would co n t r ol ce r tain zones during daylight hours, while a lighting co n t r o l
p a n e l’s time clock would co n t rol the same area during night time hours .
F i x t u r e lo c a t i o n s
The physical lo cation of some facility equipment, such as warehouse shelves, or even the
H I D f i x t u r es themselves may impact the effe c t i v e n e s s of particular co n t r ol methods. Fo r
i n s ta n c e, in a warehouse, shelf height may impede the line of sight of a pass i v e infra r e d
sensor so that a pre f e r red method might be a time switch at the end of each aislew a y.
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B i - l e v e l H I D C o n t r o l s
S t ep 3 - Evaluating co n t rol appro a c h e s
D i f f e rent facilities will call for diffe rent HID co n t rol st r a tegies. Usage patterns of the fa c i l -
ity (defined as how many occupants use the space as well as how and when they use it)
a re key to selecting the appro p r i a t e ones. Ass e ssing how the space is being used will help
the designer determine the optimal co n t r ol st r a te g y.
For HID co n t rol, two specific approaches can be imple m e n ted, either singly or co m b i n e d :
• Individual pinpoint co n t rol
• C ove rage co n t rol zones
O f t en, both co n t r ol approaches will be imple m e n ted in the same facility to provide appro-
p r i a t e co n t r ol for areas with diffe r ent usage patterns.
Pinpoint co n t rol is “one-to-one” co n t rol; that is, a single dev i c e co n t rols a single HID fix-
t u re and DM. With this approach, individual co n t rols and individual DM modules are
a t t ached to individual HID fixtures. This is beneficial when occupancy and traffic patte r n s
change ra p i d ly in specific areas.
C o ve r age co n t r ol invo l ves creating zones of cove r age by linking multiple HID fixtures and
their accompanying DM modules together and then connecting them to a single lighting
co n t r ol dev i c e. More than 100 individual HID fixtures and DM modules may be co n n e c te d
in this manner. By creating these zones, users can co n t rol the light in specifica l l y defined
a reas unifo r m l y. They can also acco m m o d a te the varying traffic and occupancy patterns of
d i f f e rent areas more clo s e l y, resulting in gre a ter energy savings.
P i n p o i n t
co n t ro l
C o ve r a g e
co n t r o l
E x a m p l e
In a parking garage, occupancy-based pinpoint co n t ro l
is sele c ted for turns on ramps or areas near eleva to rs
b e c ause traffic patterns in those areas can change
ra p i d ly and unpre d i c ta b ly.
P roducts Used
DM-105-WP, 24 VDC
o c cupancy sensor
E x a m p l e
S t o c k room aisles are defined as individual zones co n-
t ro l led by occupancy sensors, to re f l ect their infre q u e n t
use. The sto c k room loading dock area, however, is
co n t r o l led by a ce n t ral co n t r ol panel with preset hours
of operation to re f l ect its much more regular use.
P roducts Used
DM-100, lighting co n t r o l
panel, 24 VDC occ u p a n c y
s e n s o r s
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B i - l e v e l H I D C o n t r o l s
S t ep 4 - Wiring and insta l l a t i o n
I n s talling an HID co n t r ol system begins with identifying the appro p r i a te lo cations for both
the DM module (if it is to be ex ternal to the fixture) as well as the co n t r ol dev i ce. (See
page 2 on selecting co n t ro l
d ev i ce s ) .
A DM-100 can be insta l l e d
d i re c t l y on the HID fixture .
When it will be insta l led this
way, the co n t ra c tor should
mount the module to the
junction box above the fixture
via a 1/2-inch knockout.
DM modules may also be
i n s ta l led re m o t e l y, such as
on the girder or ra f t er fro m
which the fixture is atta c h e d .
Then, the insta l ler should
connect the DM module to
the junction box via co n d u i t .
R e m o t e installation must be
within six feet of the fixture to co m p l y with National
E lectric Code (NEC) provisions that re strict the le n g t h
of flex i b l e metal co n d u i t .
For outdoor applications, a wate r p r oof ve r sion of the
DM is mounted to the fixture head. Wiring to the sen-
sor can be accomplished via the provided outdoor
ra ted wire on the ex t ernal pole and cro ss members .
A l t e r n a t i ve ly, the ca b l e can be ro u ted inside the pole ,
if wind loading is not adve rs e ly affe c t ed by drilling into
the pole .
I n s talling DM
m o d u les
Fixture-mounted DM-
100
Remotely mounted DM-100
DM-105-WP Mounting
Fixture-mounted DM-
105
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B i - l e v e l H I D C o n t r o l s
T h e r e are two basic ways to wire DM modules depending
on the model. The two wiring methods are determined by
whether the dual ca p a c i tor, used to switch the ballast fro m
a high level to a low level, is lo c a ted inside the fixture or
inside the DM module. The ca p a c i tor values are dete r-
mined by the type of ballast being co n t ro l l ed. It is impor-
tant in all cases, to co n tact Watt Stopper to determine the
co r r ect dual level ca p a c i tor values for the fixture that will
be co n t r o l led by the DM.
The DM-100 is pre - w i red with the co r rect ca p a c i tor for the
b a l l a s t type inside the DM itself. For this reason, the
D M -100 is best suited for re t r ofit applications and can be
m o u n ted re m o te ly from the fixture .
DM-105 models come in a ve rsion for indoor applications, and a ve rsion for outdoor appli-
cations. The dual level ca p a c i tor is wired inside the fixture in applications using the DM-
105. A DM-105 can be used for new co n struction projects, where the ca p a c i tor is pre -
i n s ta l led in the fixture. It can also be used in re t rofit applications, where the ca p a c i tor is
field insta l l e d .
S t ep 4 - Wiring and insta l l a t i o n
Wiring DM
m o d u les
Basic wiring of DM-100 with HID
fixture in a retrofit application.
Basic wiring of DM-105 with HID fix-
ture for new or existing fixtures.
Wiring of DM-105-WP for HPS fixtures
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B i - l e v e l H I D C o n t r o l s
S t ep 4 - Wiring and insta l l a t i o n
In some applications, the co n t r ol dev i c es will be lo c a ted on or near the HID f i x t u re and
DM module (i.e., occupancy sensors, photo cells). To install these types of co n t rols, it is
re c ommended that insta l le r s use specialized mounting bra c k ets, such as the MB-1 or
MB-2. Both bra c k ets have been designed specifica l ly for Watt Stopper co n t r ol dev i c e s ,
and include adjusta b le mounting plates for positioning the dev i c e at the appro p r i a te
a n g l e.
I n s ta l l e r s use the MB-1 to mount co n t ro l s
on walls, ceilings, or gird e rs. This bra c k e t
is pre f e r red for installations where the
co n t r ol dev i c e is an occupancy sensor that
will be covering aisleways or closed sto r-
age areas.
For insta n c e, in using the DM-100 with a
CX-100-4 sensor for aisleway entry cove r -
age, the insta l l er would first mount the
MB-1, then ensure it was level using the
built-in bubble level on the bra c k e t .
F i n a l l y, the insta l l er should adjust the
a n g l e of the sensor to the re c o m m e n d e d
e l evation of 33 degrees. (For additional
i n f ormation on sensor placement, see the
a p p l i cation and design guide for occupancy sensors in this binder.)
For outdoor co n t rols, an EW or EN series
sensor should be mounted using the
1 / 2-inch knockout on a watertight, outdoor
ra ted junction box .
Designed specifica l l y for use with HID fix-
t u res, the MB-2 bra c k et provides the ability
to install the co n t r ol dev i c e dire c t l y on the
f i x t u re re f le c to r. This option is pre f e r red fo r
i n s talling co n t rol dev i ces in open are a s .
With the MB-2 bra c k et, the insta l l er wo u l d
f i r st mount the dev i c e, such as a photo c e l l ,
to the bra c k e t ’s adjusta b l e mounting plate .
Then, the bra c ket would be attached to the
f i x t u re re f le c tor bell, secured to the rim by
the three clamping screws. Once mounte d ,
the plate would be adjusted to the pro p e r
p o s i t i o n .
Fixture
mounting
bracket
Mounting a sensor using
the MB-1 bracket
Fixture-mounted photocell using
the MB-2 bracket
DM-100
MB-2 bracket
Photocell
I n s talling
co n t ro l
d e v i ce s
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B i - l e v e l H I D C o n t r o l s
Application Examples
A p p l i c ation description
Wa r ehouse with skylights and
m u l t i p l e diffe r ent work are a s
( a i s l eways, open areas, quality
co n t r ol opera t i o n s ) .
C o n t rol needs
Pinpoint and cove rage co n t ro l .
Daylighting co n t rol. Auto m a t i c
s h u t off when operating hours
conclude for quality co n t r o l
o p e r ations area (remainder of
facility is 24/7 operation).
S o l u t i o n
LS-100 in open area zone to
signal DM modules to switch to
low when daylight is adequate .
Pinpoint co n t rol in aislew a y
zones with CX-100 occupancy sen-
s o rs. CI sensors provide ongoing co n t r ol and automatic shutoff in quality co n t r ol open
a reas.
A p p l i c ation description
R o o f ed parking garage open on all
sides to outdoors. Lighting is oper-
a ted co n t i n u a l ly; occupancy is spo-
radic during the late nighttime-early
morning hours.
C o n t rol needs
S c h e d u l ed co n t r ol throughout fa c i l-
ity, with occupancy-based co n t r o l
zones at crucial areas (i.e., eleva to r s
and stairways, ramps, walkways).
R e d u c e lighting around gara g e
p e r i m e t er when daylight is ade-
q u a te.
S o l u t i o n
Lighting Inte g r a tor panel prov i d e s
s c h e d u l ed co n t r ol for 24/7 operation, with lower lighting levels facility-wide from dusk to
dawn. Occupancy sensors co n t rol critical zones to override scheduled co n t rol and signal
DM modules to switch HID lighting to high when occupied. Photo cells co n t r ol perimete r
lighting to signal DM modules to switch lighting to low levels when daylight levels beco m e
sufficient.
B i - level HID co n t rol applica t i o n s
Wa rehouse
Skylights
LS-100 photocell
(open area zones)
CX-100 Occupancy sensor
(aisleway zones)
CI occupancy
sensors
DM-100 mounted
on HID fixture
Quality control
operations (pin-
point control)
A warehouse design utilizes two types of occupancy sensors
in different zones, as well as a zone controlled by a photocell.
Coverage zones in specific areas, such as aisleways and areas around
elevators, ensure that occupancy sensors will override a central control
panel and switch lights to high when there is movement through the
area. Other garage areas, such as the elevator area, remain on low levels
while vacant.
Pa r k i n g
g a r a g e
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B i - l e v e l H I D C o n t r o l s
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B i - l e v e l H I D C o n t r o l s
A p p l i c ation description
Gymnasiums often have occupancy patterns with regular usage over a co n s i s tent time
span as well as times when they are unoccupied or nearly va c ant. For insta n c e, in the ve r y
e a r ly mornings, little use may be made of the space except for mainte n a n c e pers o n n e l
p reparing for the day’s schedule. At lunchtime and late afternoons, activity may increase.
C o n t rol needs
R e d u c e light levels auto m a t i ca l ly when occupancy ends. Automatic shutoff when sched-
u l ed activities are concluded for the day.
S o l u t i o n
In cases where the gymnasium utilizes a lighting co n t r ol panel, the facilities manager
could co n f i g u re the co n t rol schedule to re f l ect occupancy patterns. In addition, occ u p a n c y
s e n s o r s could be used to override co n t rol schedules when desired.
In other cases, a time switch (i.e., TS-400) may be the most co n venient co n t rol method
both for mainte n a n ce personnel and occupants. By connecting all the DM modules and
linking them to the TS-400, co n s i stent time-based co n t r ol can be achieved from a single
lo c a t i o n .
B i - level HID co n t rol applica t i o n s
G y m n a s i u m
On the left, the morning janitor switches lights with the time switch on the wall, which increases the gymna-
sium HID lamps to high. On the right, at the end of the day’s activities, the time switch times out and the
lights return to low.
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B i - l e v e l H I D C o n t r o l s
A p p l i c ation description
Many times the HID lighting for out-
door parking lots turns on at dusk
and off at dawn, even though the lo t
may be used infre q u e n t l y. The ability
to switch these HID lights from high
to low when the lot is unocc u p i e d
and bright light is not needed wo u l d
s a v e co n s i d e ra b l e energ y.
C o n t rol needs
S c h e d u l ed or photosensor co n t rol to
keep lights off during daylight hours .
Motion-based cove rage co n t ro l
zones at light posts to bring lighting
to full power when a car or pers o n
e n te rs the space. Reduce light leve l s
a u to m a t i ca l l y when occupancy ends.
S o l u t i o n
The DM-105-WP co u p led with an EW low vo l tage outdoor sensor can keep the HID light-
ing at a low level until the sensor detects a car driving into the lot or a person walking
t h rough the lot. This co n t r ol method is especially effe c t i v e for infre q u e n t l y used areas of
the parking lot like the back or side of the building. The EW sensor or multiple sensors
can simulta n e o u s l y co n t r ol seve ral fixture heads on the same pole. In this way, outdoor
HID lighting can be co n t ro l l ed just like warehouses or gymnasiums.
B i - level HID co n t rol applica t i o n s
O u t d o o r
parking lo t
Four HID ballasts controlled by
two motion sensors
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