Installation Guide
4
Placement options for under cabinet lighting
For maximum light output, mount the LED tape 
towards the front of the cabinet with LEDs facing 
down. To focus light on the work surface and also 
light your backsplash, position the tape light an 
inch or two back from the front of the cabinet. 
This mounting position works best with dull or 
matte fi nished surfaces.
If your countertop is refl ective, install the LED tape 
lighting on the inside back of the cabinet lip frame 
with the LEDs facing towards your backsplash. 
This method helps eliminate unwanted light 
refl ections and bright spots refl ecting off your 
countertop. Because of the wide beam angle of the 
tape light, this mounting position will still provide 
ample lighting.
Continuous run mounting of LED tape lighting is 
achieved by drilling a 1/2 in. 
hole through cabinet side frame 
lips. When mounting on the 
back side of the front frame lip, use a multi-tool 
oscillating saw to make small vertical cuts in the 
dividers to create slots that allow the tape lighting 
to pass from one cabinet to another.
Tape light installed through 
a drilled hole.
Tape light installed through a slot 
cut into cabinet divider.
Create a visual barrier when mounting under a cabinet or shelf with no 
lip to conceal the LED tape light strip. Use a piece of angle trim, quarter 
round molding, or any type of trim desired to hide the LEDs.
Above Cabinet Uplighting
Most cabinet tops have uneven surfaces. To create beautiful, indirect 
uplighting over cabinets, simply mount RibbonFlex Pro on any rigid strip 
(e.g., thin lattice or corner guard molding) and place on top of cabinets. 
Angle the strip position to achieve the desired illumination.
Cove Lighting
Try different mounting 
positions to get your 
desired lighting effect. 
For a seamless glow 
with no bright light 
spots, keep LED tape 
light strip at least 3/4 in. 
away from walls.
Troubleshooting
Tape light strip does not light
■
Make sure your LED power supply is receiving 120-volt power.
■
Confi rm you have maintained correct polarity (+ to + and – to –) when 
joining LED strips and when connecting to the 12-volt power supply.
■
Check all tape light connections and any switch or dimmer connections 
from the power supply to the LED tape light. Consider testing with a 
multimeter to ensure light strip is receiving 12-volt power.
Only part of the LED tape light strip is lit
■
Check connections to the part of the strip that is not lit.
■
Confi rm that you have maintained correct polarity to the unlit section.
■
RibbonFlex Pro is made with three LEDs connected as one series. 
If you experience a partial failure, you can carefully cut out the 
damaged section and splice in a new section as needed to repair.
LED tape lights blink on and off
■
Your power supply is not adequate for the length of LED tape light 
you are powering. Install a higher wattage power supply or reduce 
watts used by shortening the lengths of your LED tape lighting.
LEDs farthest from the power supply are noticeably dimmer
■
This is the result of voltage drop. Decrease the length of the 12-volt 
power feed wires or use thicker power feed wires between the 12-volt 
power supply and the tape lighting.
■
Use shorter lengths of LED tape lighting. Refer to Confi guration 
options in these guidelines. Consider a different confi guration.
Visit armacostlighting.com/installation for additional installation tips and FAQs.
Maximum recommended tape length
Confi guration
30 LEDs/meter 60 LEDs/meter 120 LEDs/meter
Length Watts used Length Watts used Length Watts used
Straight run
32.8 ft. 
(10m)
~23
16.4 ft. 
(5m)
~28
16.4 ft. 
(5m)
~48
Center feed / 
Loop back
65.6 ft. 
(20m)
~46
32.8 ft. 
(10m)
~56
32.8 ft. 
(10m)
~96
Array Varies based on layout and max wattage of power supply
Input voltage ........................................................................ 12-volt DC
Beam angle .................................................................................. 120°
LED light source ................................................. High Power SMD 2835
See product packaging or visit armacostlighting.com for additional 
product-specifi c information.
Limited three-year warranty
Improper installation, abuse, or failure to use this product for its 
intended purpose will void warranty. This warranty only applies when all 
components, including LED power supplies, have been provided by or 
approved for use by Armacost Lighting. The warranty does not cover labor 
or any other costs or expense to remove or install any defective, repaired 
or replaced products.
Mount LEDs 
3/4 in.or greater 
from wall to avoid 
bright spots
CEILING
Baltimore, Maryland
armacostlighting.com
© 2011-19 Armacost Lighting. All rights reserved.
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