How to Choose a Side-Emitting Addressable RGB LED Strip for Signage and Edge Lighting
How to Choose a Side-Emitting Addressable RGB LED Strip for Signage and Edge Lighting
A practical guide to selecting a DC5V SK6812 side-emitting RGB strip by viewing direction, pixel pitch, control and installation conditions.
Start with the light direction and viewing position
Top-emitting strip is often specified for a channel that actually needs light to leave sideways. The result can be a bright line aimed at the wrong surface, uneven illumination inside a letter, or an effect that disappears when viewed from the intended direction. For signage, lightbox edges, cabinet accents and narrow architectural reveals, first confirm the emitting direction, the profile opening and where the audience will stand.
What 120 LEDs/m means on this model
The published configuration uses a side-emitting SMD4020 RGB LED on an 8 mm PCB. Light leaves from the narrow edge rather than the front face, and the listed beam angle is 120 degrees. This makes channel depth, diffuser position and the distance to the illuminated edge part of the optical decision. High LED density cannot compensate for a channel or profile that directs light toward the wrong surface.
The product page lists 120 LEDs/m for this configuration and also lists 60, 90 and 144 LEDs/m options. With SK6812, each listed LED is individually addressable. At 120 LEDs/m, the nominal LED-to-LED pitch is about 8.3 mm: 1000 mm divided by 120. That can support close-up colour flow and detailed chasing when the channel, diffuser and viewing distance are appropriate. A lower density may be sufficient for a more distant outline; a higher density should be evaluated when the design truly needs smaller visible steps.
Use 60 or 90 LEDs/m for more distant outlines where larger visible steps are acceptable. Evaluate 144 LEDs/m only when the project truly needs smaller visible steps.
DC5V power planning without guessing
This is a DC5V product. The published load is 36 W per standard 2.5 m reel, or 14.4 W/m by direct division. At DC5V, 36 W equals a theoretical 7.2 A.
Those figures are theoretical values calculated from the published rating. Brightness, RGB combinations and programme content change actual consumption. One reel is not a complete installed system: divide power circuits from the approved layout and measure loaded voltage at the end of every circuit.
Voltage drop is usefully understood as current multiplied by line resistance. A DC5V pixel strip therefore needs deliberate attention to cable gauge, PCB copper, connector count, feed position and the target effect. The page offers regular 2 Oz copper and optional 3 Oz copper. More copper can help evaluate circuit resistance and operating heat, but it does not replace sensible circuit splitting or a loaded-voltage test.
SK6812 cascade control and cutting positions
SK6812 uses cascaded pixel data with PWM control. The project questions are pixel count, data direction, controller compatibility, port allocation and data mapping, rather than DMX addresses for every LED. The page states that the flexible PCB can be cut and rejoined at each marked copper tab. That published cutting position is the basis for fabrication; individual addressability does not by itself define a cutting length.
PCB, channel and protection choices
The published options are IP30 and IP65, black or white PCB, and a 2.5 m standard reel. IP30 is for dry indoor conditions where the mounting structure is suitable. IP65 can be evaluated for moisture or splash exposure, while ends, joins, cable exits and drainage still need a complete installation solution. The 8 mm PCB is useful for slim profiles, but confirm profile width, clip or adhesive contact, bend path and corner treatment before freezing the design.
Quick selection table
| Close viewing and detailed colour movement | Evaluate 120 LEDs/m when the side-emitting line is seen closely and the channel can control the light. |
|---|---|
| Distant outlines or broad colour flow | Evaluate 60 or 90 LEDs/m options where larger pixel steps are visually acceptable. |
| Dry indoor channel | Evaluate IP30 only where the profile and environment remain dry. |
| Moisture or splash exposure | Evaluate IP65 with sealed ends, cable exits and the complete installation arrangement. |
| Long or divided runs | Use 36 W per 2.5 m reel as the published load input; split circuits and verify loaded voltage. |
| Controller choice | Confirm SK6812 compatibility, pixel capacity, data direction and data mapping. |
Where this LIKELIGHT configuration fits
LIKELIGHT's published side-emitting configuration combines DC5V, SK6812, SMD4020 RGB, 120 LEDs/m, a 120-degree beam angle, 36 W per 2.5 m reel and 8 mm PCB width. It can be a strong starting point for channel letters, signage backlighting, display cabinets, slim panels, lightbox edges, TV or monitor bias lighting, and stair or shelf underlighting when the side-emitting direction matches the actual installation. It is not the right starting point when the project needs light projected from the PCB face instead of its edge.
| Control IC | SK6812; individually addressable RGB LEDs |
|---|---|
| Voltage | DC5V |
| LED source and density | SMD4020 RGB; 120 LEDs/m |
| Optics | Side emitting; 120-degree beam angle |
| PCB | 8 mm; black or white option |
| Power and reel | 36 W per 2.5 m standard reel |
| Copper and protection | 2 Oz standard, 3 Oz option; IP30 / IP65 options |
Information needed for a quotation
- Profile section or installation drawing
- Total length and separate zone lengths
- Viewing position and target effect
- Environment and protection target
- Controller model, cable/connector direction and PCB colour
- Sample or delivery requirement
These details let pixel density, power circuits and connection method be evaluated together against the real project, rather than treating one reel as a complete installed system.
