When Is a 30W/m COB LED Strip the Right Choice? Power, Heat and Optical Planning
A dense COB strip can remove visible light points, but a 30W/m design creates a different driver, conductor, profile and maintenance problem from ordinary accent tape. This guide uses the published DC24V, 20mm, Ra≥90, 180° and 3300–3900lm/m data to decide where the product fits.
The real decision is not COB versus visible dots
COB construction can create a visually continuous luminous surface, but buyers still need to decide whether the project needs 3300–3900lm/m or only a decorative glow. Installing a 30W/m product where a lower-output strip would suffice increases driver size, conductor current and heat without improving the design objective.
The published applications include hotels, shopping malls, furniture, cabinets and shelves for direct or indirect light. Direct task or display lighting makes better use of the available output; indirect coves lose light on surrounding surfaces and should be evaluated with a mock-up rather than by strip lumens alone.
Read width, beam and colour quality as one optical system
The product page identifies a 20mm flexible COB strip, 180° beam angle and Ra≥90, with 2700K, 3000K, 4000K and 6000K white options plus red, blue and green. The 20mm width must match the channel or mounting surface; a narrow profile cannot be assumed to fit.
Ra≥90 supports colour-sensitive retail, hospitality and furniture displays better than a low-CRI source, but colour temperature still changes material appearance and atmosphere. Approve the intended CCT against actual finishes, diffuser and mounting distance.
Calculate the electrical load before selecting the driver
The published 30W/m at DC24V gives 30 ÷ 24 = 1.25A per metre. A 5m theoretical load is 150W and 6.25A. These values are the calculation baseline, not a measured installed result or a recommended maximum run length.
Divide the project into serviceable circuits according to final lengths, cable size, connector rating, dimming method and driver location. Measure voltage at the far end under the intended operating level; do not assume that one 5m reel should be powered from one end.
High output changes thermal and dimming decisions
Electrical power not emitted as useful light becomes heat in the strip, adhesive, mounting surface and surrounding cavity. The page does not publish a required aluminium profile or operating temperature, so the thermal solution must be validated with the final channel, diffuser and ambient condition.
The page also does not publish a control architecture or dimming protocol. Specify the compatible DC24V dimming method, driver and control interface separately, and test low-level smoothness and restart behaviour if the project depends on scene control.
IP20 and 20mm width define practical installation limits
IP20 is suitable for dry protected interiors. It does not cover direct water, condensation-prone cabinets or exterior exposure. In furniture and retail joinery, keep the strip away from metal edges, moving hardware and inaccessible sealed cavities.
A 20mm strip needs a correspondingly wide mounting path and connector strategy. Check channel internal width, bend path, soldering access, diffuser clearance and replacement method before cutting joinery or ordering custom profiles.
30W/m COB project decision table
| Project condition | Decision |
|---|---|
| Retail shelf or display | Use Ra≥90 and approve CCT against the displayed materials. |
| Hotel cove or feature line | Mock up the 180° distribution and surface reflectance before fixing output. |
| Five-metre theoretical zone | Start from 150W and 6.25A, then divide circuits and add driver margin. |
| Narrow existing channel | Reject unless its internal width safely accepts the 20mm strip and connectors. |
| Wet or exterior location | Do not use the published IP20 configuration as the environmental solution. |
| Dimming or scene control | Freeze the DC24V driver and dimming interface and test low-level behaviour. |
Where the LIKELIGHT 20mm COB case fits
LIKELIGHT publishes model L-S-COB-DC24V-20mm with DC24V, 30W/m, Ra≥90, IP20, a 180° beam and 3300–3900lm/m at 110–130lm/W. The listed CCT choices support warm hospitality scenes through cooler display lighting.
It fits dry commercial interiors needing a broad, continuous and relatively high-output line when the mounting profile, driver and power zoning are engineered together. It is a poor fit for wet locations, very narrow channels or projects that have not allocated heat dissipation and service access.
| Model | L-S-COB-DC24V-20mm |
|---|---|
| Electrical | DC24V; 30W/m; theoretical 1.25A/m |
| Optical | 3300–3900lm/m; 110–130lm/W; 180° |
| Colour quality | Ra≥90; 2700K / 3000K / 4000K / 6000K |
| Other colours | Red / blue / green |
| Installation boundary | 20mm width; IP20; dry protected interior |
Information required before quotation
- Total length and length of each power zone
- Required CCT, colour and target use
- Channel internal width, diffuser and mounting detail
- Driver model, dimming method and control interface
- Cable route, connector method and service access
- Sample length, quantity and delivery schedule
These inputs let LIKELIGHT assess optical output, driver sizing, power zones and mounting width together instead of treating a high-density reel as a complete linear-lighting system.
FAQ
Is 30W/m automatically better than a lower-power COB strip?
No. It is useful when the project needs the published output. For decorative accents, additional power can create unnecessary driver and thermal demand.
Can one 5m reel use one feed point?
The page does not publish a maximum feed length. Calculate 150W and 6.25A as a baseline, then verify cable loss and remote-end voltage in the final assembly.
Does Ra≥90 choose the correct CCT?
No. CRI describes colour rendering quality; CCT changes the visual warmth. Both must be approved with the real materials.
Can this IP20 strip be installed in a bathroom or outdoors?
Not from the published configuration alone. IP20 is a dry-interior boundary, so wet or exterior use needs another verified protection solution.
