Williams LX4RT is a highly versatile LED lighting system designed for both stand-alone and continuous row-mount applications. With its ultra-thin profile and innovative design, the LX4RT seamlessly integrates into any ceiling, providing exceptional illumination while maintaining a sleek and modern aesthetic. Engineered for both commercial and residential use, this advanced lighting solution offers a range of customizable options to meet the specific needs of any space.
Williams LX4RT is a highly versatile LED lighting system designed for both stand-alone and continuous row-mount applications. With its ultra-thin profile and innovative design, the LX4RT seamlessly integrates into any ceiling, providing exceptional illumination while maintaining a sleek and modern aesthetic. Engineered for both commercial and residential use, this advanced lighting solution offers a range of customizable options to meet the specific needs of any space.
LX4RT LED SERIES
INSTALLATION INSTRUCTIONS
H.E. Williams, Inc. Carthage, Missouri www.hew.com 417-358-4065
Page 1 of 4
PN 49090154
07/21/16JL
WARNING:
• This product must be installed in accordance with the applicable
installation code by a person familiar with the construction and
operation of the product and the hazards involved.
• Make sure all electrical power is turned off while installing the fixture.
• This luminaire must be adequately grounded for protection against
shock hazards and to assure proper operation.
• Disconnect power before servicing.
• LEDs are ESD (Electro Static Discharge) sensitive devices that can be
easily damaged if the proper ESD mitigating steps are not taken.
• LEDs are very sensitive to mechanical damage. Caution must be taken
to avoid damage to the LEDs.
• ESD or mechanical damage voids all warranties.
FIXTURE MUST BE INSTALLED PRIOR TO DRYWALL OR FINISHED CEILING MATERIAL.
STEP 1: CEILING FRAMING ALLOWANCES
WARNING: Ceiling material attaches to this fixture but the
attachment is NON-STRUCTUAL.
Ceiling material MUST be structurally supported by framing or other
means.
• Framing allowance for width of stand-alone fixtures is 5 ½”
minimum.
• Framing allowance for width of continuous row mounted fixtures
is 14 ½” for access to cinching screw.
• Framing allowance for length (if desired) is the ACTUAL
ILLUMINATED LENGTH shown on fixture specification sheet
+1-1/2” minimum. Additional clearance may be required for end
plate electrical hook-up.
STEP 2: FIXTURE PREPARATION
A. INSTALL BACKER FLANGES FOR PROPER CEILING
THICKNESS
• HAND TIGHTEN Screws. DO NOT OVER TIGHTEN.
• Use tin snips to modify Backer Flange length as required.
Fig. A Ceiling Thickness Chart
Channel Position
A B C
1
1/4 7/8 1-1/2
Backer 2 3/8 1 1-5/8
Flange 3 1/2 1-1/8 1-3/4
Position 4 5/8 1-1/4 1-7/8
5
3/4 1-3/8 2
• Find ceiling material thickness in Ceiling Thickness Chart (Fig. A).
• Find the corresponding Backer Flange position number (Fig. B).
• Find the corresponding Channel position (Fig. C).
• Align the hole position in the Backer Flange with the position on
the Channel and install Backer Flange to Channel with #8 x 1/4”
long screws provided.
• DO NOT OVER TIGHTEN SCREWS
Fig. B Backer Flange Positions
B. JOINER FIXTURES (as required) FOR ROW-MOUNT
APPLICATION ONLY
NOTE: In a continuous row-mount application, the second end plate
assembly supplied with the feeder fixture installs onto the end of
the last joiner fixture in the run.
1. Install alignment shims into leading end of joiner fixture
housing.
a. Insert shims approximately 1/2” and bend slightly outward
to create binding at steps B and C.
b. Continue to insert the side shims until the slot reaches the
fixture housing.
c. Continue to insert the top shim until the slot is only half
visible.
a
a
a
C. FEEDER & JOINER FIXTURES (as required) FOR ROW-MOUNT
APPLICATION ONLY
1. Install cinching brackets 1/4” from ends of mating fixture
housings with #8 x 1/4” long screws provided. Hand tighten
screws. DO NOT OVER TIGHTEN.
Cinching Bracket
(Female)
Cinching Bracket
(Male)
1/4”1/4”
Feeder
or joiner
housing
Joiner
housing
Fig. C
Channel
Positions
c: Slot
half visible
b: Slot
fully visible
Confirm width gauges are installed
LX4RT SERIES INSTALLATION INSTRUCTIONS
H.E. Williams, Inc. Carthage, Missouri www.hew.com 417-358-4065
Page 2 of 4
PN 49090154
STEP 3: FIXTURE MOUNTING
A. INSTALL FIRST FIXTURE (Stand-Alone fixture or FEEDER
fixture in row-mount application)
1. Raise the fixture into position and secure using the suspension
holes for wire tie or 1/4-20 rod.
Suspension Holes
for WIRE TIE or 1/4-20 ROD
2. Ensure proper fixture level by hanging the bottom of backer
flange even with the ceiling material mounting structure.
Ceiling Material
Mounting Structure
Ceiling Material
Backer
Flange
B. INSTALL JOINER FIXTURE(s) (as required) FOR ROW-
MOUNT APPLICATION ONLY
1. Hang far end of joiner fixture and raise the joining end into
alignment with previous fixture.
2. Make electrical connections between fixtures
3. Mate joiner fixture to previous installed fixture and tighten
cinching screw into cage nut in mating cinching bracket.
Tighten until connection is firm. Cinching brackets should not
touch. (5/16” Drive)
1/4”1/4”
Brackets may flex
when tightened but
should not touch
5/16” drive
4. Continue with remaining joiner fixtures as required until row is
complete. Be sure to install the end plate assembly supplied
with the feeder fixture onto the end of the final joiner fixture.
C. CONTINUE FIXTURE INSTALLATION
1. Set width gauges at equal distances to maintain channel width
during ceiling material installation.
1. Make electrical connections to fixture.
2. Install ceiling material within 3/8” from housing.
3. Fasten ceiling material to the backer flanges on the fixture.
WARNING: Ceiling material attaches to this fixture but the
attachment is NON-STRUCTUAL. Ceiling material MUST be
structurally supported by framing or other means.
Ceiling Material
Backer
Flange
3/8” maximum gap between
ceiling material and fixture housing
END VIEW
4. Remove width gauges from housings.
a. Cut gauge in half.
b. Push gauge halves up.
c. Pull gauge halves out from fixture channel.
LX4RT SERIES INSTALLATION INSTRUCTIONS
H.E. Williams, Inc. Carthage, Missouri www.hew.com 417-358-4065
Page 3
PN 49090154
TRIM SERIES (LX4RTR FLANGED TRIM VERSION)
STEP 4: INSTALL GALVANIZED FIXTURE COVER
A. For FLANGED TRIM installation, install galvanized fixture
cover supplied with fixture to protect from over spRay
during ceiling finish work. Tape over finger holes after
installation.
1. Align side flanges on fixture cover with end plate.
End Plate
Side Flange
Align
SIDE VIEW
2. Overlap ends of fixture covers.
STEP 5: TAPE OVER FINGER HOLES IN FIXTURE COVERS
Tape over holes (painter’s
tape)
STEP 6: FINISH CEILING TREATMENT
Including texture and paint as required.
STEP 7: INSTALL FLANGED TRIM (AS REQUIRED FOR TRIM
APPLICATION)
A. Install and center double mitered end trim into ends of
fixture.
5.7” end trim
Side trim
1. For row-mount application, cut the double mitered side trim,
supplied with feeder fixture, in the middle between clips that
are approximately 4” apart. Install one half of the trim into the
fixture at the start of the row and the other half of the trim
into the fixture at the end of the row. Position tight against
the double mitered end trim already installed.
Length varies by application
4” approx.
2ft max
between clips
Cut on centerline 3/4” approx.
(both ends)
DBL miter - side trim
2. Install 8ft side trims between the previous trims installed.
Cut the last 8ft side trim to fit square with the half piece of
mitered side trim at the end. DO NOT RECUT THE MITERED
ENDS.
Cut to length
as required
Half piece of
mitered side trim
(both ends)
8ft side trim
STEP 8: INSTALL LENSES
A. Insert one side of lens into one side of fixture housing.
B. Push the corner of the opposite side of the lens into place.
C. Continue pushing along the housing until the entire lens is
installed.
D. Cut final Row-Mount lens to length as required.
To remove lens, pry out starting with the 4 inch wide end.
Removal
C
B
A
LX4R90T CORNERS: FIXTURE LAYOUT
Corner fixture orientation follows the flow from the power
entry end to the end of the run.
LX4R90T-JR
LX4RT-4-J
POWER
ENTRY
LX4R90T-FL
FEEDER
LEFT
JOINER
RIGHT
JOINER
LEFT
JOINER
RIGHT
4FT
JOINER
LX4R90T-JR
LX4R90T-JL
SAMPLE
FIXTURE LAYOUT
VIEWED FROM ABOVE
CEILING PLANE
LX4RT
LX4RT SERIES INSTALLATION INSTRUCTIONS
H.E. Williams, Inc. Carthage, Missouri www.hew.com 417-358-4065
Page 4 of 4
PN 49090154
TRIMLESS SERIES (LX4RTL FLANGELESS TRIM VERSION)
STEP 4: INSTALL FLANGELESS TRIM
A. Install and center double mitered end trim into ends of
fixture.
5.9” end trim
Side trim
1. For row-mount application, cut the double mitered side trim,
supplied with the feeder fixture, in the middle between clips
that are approximately 4” apart. Install one half of the trim into
the fixture at the start of the row and the other half of the trim
into the fixture at the end of the row. Position tight against
the double mitered end trim already installed.
Length varies by application
4” approx.
2ft max
between clips
Cut on centerline 3/4” approx.
(both ends)
DBL miter - side trim
2. Install 8ft side trims between the previous trims installed.
Cut the last 8ft side trim to fit square with the half piece of
mitered side trim at the end. DO NOT RECUT THE MITERED
ENDS.
Cut to length
as required
Half piece of
mitered side trim
(both ends)
8ft side trim
STEP 5: INSTALL FILM MASKING (SUPPLIED WITH
FIXTURE)
NOTE: Adhesive on masking film is not permanent and can be
reapplied.
A. Adjust length of mask by cutting mid-section only as
required. Use factory cut ends to mask tight with ends of
fixture.
Factory cut end Cut from center as required
1. Allow for 1”-2” overlap of masking when installed.
1”-2” overlap
2. Remove adhesive liner from one edge of masking.
3. Apply edge of mask to fixture housing inside of trim.
Mask
Factory
cut end
4. Remove adhesive liner from second edge of masking.
5. Apply second edge of mask to fixture housing.
6. Continue masking fixture row. Overlap joints by 1”- 2” as
shown above.
STEP 6: APPLY SEAM TREATMENT
A. Tape and mud trim flange to ceiling material. Apply tape to
cover half of trim.
NOTE: USE A NON MOISTURE ABSORBENT TAPE, SUCH AS
FIBERGLASS MESH TAPE, TO AVOID SEAM POPPING ON THE
TRIM.
T
ape and mud
trim flange
Tape over
half of trim
STEP 7: FINISH CEILING TREATMENT
Including texture and paint as required.
STEP 8: INSTALL LENSES (See Page 3, Step 8)
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1
-
2
-
3
-
4
Williams LX4RT is a highly versatile LED lighting system designed for both stand-alone and continuous row-mount applications. With its ultra-thin profile and innovative design, the LX4RT seamlessly integrates into any ceiling, providing exceptional illumination while maintaining a sleek and modern aesthetic. Engineered for both commercial and residential use, this advanced lighting solution offers a range of customizable options to meet the specific needs of any space.
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