Installation Guide
13
LIGHTING
A
B
C
D
E
HOW TO INSTALL TREX DECKLIGHTING
PARTS
A
A
Pyramid Post Cap Light
Riser Light SplitterDeck Rail Light Recessed Deck Light
B C D E
x2x2 x2x2
Flat Post Cap Light
1/2" 
(13 mm)
1" 
(25 mm)
NOTE: All wiring and splitters are mounted to inside of 
framing. Picture is just representation of where to place 
these in general.
WARNING: 
» DO NOT INSTALL DECKLIGHTING IN CLOSE 
PROXIMITY TO POOLS OR HOT TUBS AS 
CHEMICALS FROM THE WATER CAN DAMAGE 
LIGHTING FIXTURES.
» DO NOT INSTALL WIRING UNDER HEAVY 
WEIGHT OR LOAD AS THIS CAN DAMAGE 
WIRING. 
Lighting and Wiring Overview
TOOLS NEEDED
»   5ft, 10ft, 20ft, 40ft, and 60ft connection/extension 
wires sold separately (these are male-to-male 
connection wires).
HELPFUL TIPS 
»   Please note that Trex lighting operates on DC 
power. NEVER mix AC and DC fi xtures on the 
same circuit. Doing so will result in extremely 
premature fi xture failure and is not covered by 
the Trex limited warranty. You must use a Trex 
transformer on all Trex lighting installations.
»  Leave slack in wire to make fi xture terminations.
»   Recessed lights work well spaced 4' (1.22 m) to 
6' (1.83 m) on center around perimeter of deck.
»   Deck rail lights work well at changes in levels of a 
deck—at the top or the bottom of the stairs, or in 
conjunction with post cap lights. 
»   Recommended riser light placement is two lights 
per standard width tread. Otherwise, spacing of 
2' to 3' is considered optimal.
»   Drill holes perpendicular to the surface, being 
careful to hold drill steady, to avoid producing an 
enlarged hole. If hole is enlarged, light fixture will 
have a loose fit. Use of a flexible outdoor semi-
permanent adhesive (silicone caulk) may be 
required to anchor light in place. 
»   Riser and deck rail light holes can be through 
holes. However, recessed light holes should be 
drilled to a depth of 3/4" (19 mm). Over-drilled 
recessed light holes will require use of silicone 
caulk to anchor light in place.
»   Splitters should be placed under the deck at the 
base of each post that has lighting installed. If not 
installing lighting on posts, splitter spacing will be 
dependent on spacing of light fixtures.
»   Cap all unused female connections with caps 
provided or weather-resistant silicone to prevent 
water damage or corrosion.
»   The splitter is cross-linked so there is no specified 
plug for lights versus lead wires.
»   Leads attached to each light are approx. 5' 6"
(1.5 m to 1.8 m) in length and have male terminals 
to plug into splitter.
»   Use a separate dimmer control for each light type 
for maximum control (5-way transformer splitter 
may be required).
»   It is recommended to have power source installed 
and turned on when installing lights to ensure all 
components work.
»   When installing wiring, avoid extreme angles, 
pressure, or tension on the wiring, as this can 
cause pinching of the wiring and create a 
lighting failure.
NOTE: Avoid railing brackets and locations for deck rail 
lights when running wires up posts.
NOTE: It is recommended to install wiring and splitters 
before decking and railing have been installed. DO NOT 
run wires between joists and deck boards.










