Installation Guide
Have Questions?
1–800–BUY–TREX
Note: Construction methods are always improving. Please ensure you 
have the most up-to-date installation instructions by visiting: 
trex. com
2
TDL-1110
TREX
®
 DECKLIGHTING™
How to Install
Installing Wiring
Note: It is recommended to install wiring before decking 
and railing have been installed.
»   Use 18 gauge stranded outdoor wire (available from 
Trex) to connect wires from each light.
1.   Wiring must be run under 
the decking structure and 
behind stringers. DO NOT 
run wires between deck 
boards and joists. Staple to 
frame with cable staples 
at least 1/4" (0.6 cm) 
wide. DO NOT crush wire 
insulation with staple. 
2.   Wiring can be run under the deck and behind risers. 
Staple to frame with cable staples at least 1/4" (0.6 cm) 
wide. DO NOT crush wire insulation with staple.
3.   Run wire up the outside of each post that will have either 
a post cap light or a deck rail light. Avoid running wire 
on the side of post where railing brackets or deck rail 
lights will be installed. Leave a 6" (15.2 cm) loop at top to 
make connections. Staple to frame and posts with cable 
staples at least 1/4" (0.6 cm) wide. DO NOT crush wire 
insulation with staple. 
Note: After installing wiring, finish installing your Trex 
decking and railing by following the Trex Installation Guide. 
Making Connections
»   Polarity must be maintained through wiring system. 
Always attach the same side of the 18 gauge wire to the 
red wires on the lights. The red wires are positive.
»   The wire nuts supplied by Trex are gel-filled and 
waterproof. These wire nuts can safely attach four wires. 
1.   Strip wires to 5/8" (1.6 cm). Align any frayed strands of 
the conductors. Pre-twisting is unnecessary. 
2.   Place stripped wires together with insulation even. 
Twist connector onto wires pushing firmly until hand-
tight. DO NOT over torque. Wipe sealant in and around 
conductors and connector opening while tightening. 
DO NOT reuse.
Timer Operation Instructions
1.   Select the mode of operation:
  » Dusk to Dawn
  » 1 - 8 hours
  » Always On
  » Off
  Program repeats daily
When power is flowing to lights, green light above POWER is on.
Installing Post Cap Lights
Note: Install post cap lights after the railing system, post 
sleeve skirt, and post sleeve have been installed. 
1.   Cut the wire loop at the top of the post. Strip the wire 
ends. Make connections with the provided wire nuts.  
See Making Connections above.
2.   After verifying wiring is correct by turning lights on, 
attach the cap to the top of the post with silicone caulk.
1
3
6"
(15.2 cm)
2
Strip 
5/8"
(1.6 cm)
1
2
1
2
2
2
3
1
6"
(15.2 cm)
1




