20m COB LED Strip: Specifications, Powering, and Installation Guide

A 20m COB LED strip can provide a continuous-looking line of light across long indoor runs, but the correct power supply and wiring depend on the strip’s voltage, wattage per metre, and manufacturer-approved feed arrangement. Before selecting one, confirm the product datasheet and calculate the total load: for example, a hypothetical 20m strip rated at 10W/m requires 200W of LED power before any design allowance. In many installations, a single power connection at one end is not the right way to energize the full length because voltage drop can cause uneven brightness. This guide explains what to check, how to plan power and installation, and what information to give a supplier when requesting a quotation.

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Who This Guide Is For

This guide is intended for lighting distributors, contractors, project specifiers, and other B2B buyers evaluating a 20m COB LED strip for an indoor project. It is useful when comparing product datasheets, estimating power requirements, or preparing an installation plan. It is not a substitute for the strip manufacturer’s wiring instructions or the project’s applicable electrical requirements. Confirm product-specific details with the supplier before ordering or installation.

What a 20m COB LED Strip Is

COB, or chip-on-board, LED strip uses closely arranged LED chips beneath a continuous phosphor layer. This construction can create a smoother-looking luminous line than a strip with clearly separated light points, particularly when viewed directly or used with a shallow profile. A “20m” description identifies the stated strip length or supplied run, but does not by itself confirm that the strip can be powered from one end. Check whether the supplier offers a continuous reel, multiple connected sections, or a customized assembly.

Typical Construction and Options

Product configurations vary by manufacturer. Options may include different color temperatures, color rendering levels, strip widths, adhesive backings, cut intervals, and protection ratings. Some COB strips are designed for dry indoor locations, while others have coatings or encapsulation intended for environments with different exposure conditions. Do not infer an IP rating, dimming compatibility, or operating temperature from the COB label; request the exact specification for the model under consideration.

Specifications to Confirm Before Buying

Compare complete product data rather than relying on the 20m length alone. The strip’s voltage and power per metre determine the basic electrical load, while light output and color characteristics help establish whether it suits the visual brief. Physical dimensions and cut points affect profile selection and installation layout. For commercial sourcing, ask the supplier to identify the exact model and revision covered by the quotation.

Specification	Why It Matters	What to Confirm
Rated voltage	Determines compatible power supplies and wiring approach.	Nominal voltage, allowable range, and supplier-approved feed layout.
Power per metre	Provides the basis for estimating total load.	Rated W/m and whether the figure applies to the exact color or configuration.
Light output and color	Influence brightness, appearance, and suitability for the space.	Lumens per metre, CCT, CRI, and any available tolerances.
Dimensions and cut points	Affect fit within channels and the usable layout.	Strip width, thickness, cutting interval, and connector compatibility.
Protection and installation conditions	Help determine whether the product suits the project environment.	Specified IP rating, temperature limits, and installation restrictions.

How to Plan Power for a 20m Run

Start with the strip’s rated power per metre, then multiply that figure by the installed length. For an illustrative calculation, a 20m run at 10W/m has a nominal load of 200W; this is an example only, not a specification for every 20m COB strip. At 24V, a 200W load corresponds to approximately 8.33A, calculated as watts divided by volts. Use the actual product rating, and have the project electrician or supplier confirm the appropriate supply capacity, wiring, and protection.

Choose the Feed Arrangement

Voltage drop along conductors and the strip can reduce brightness toward the far end of a long run. The amount depends on factors such as strip design, conductor size, current, and wiring length, so a universal feed spacing cannot be stated without product and installation details. Ask whether the manufacturer permits end feeding, feeding from both ends, or multiple parallel injection points. Where separate feed points are used, follow the manufacturer’s diagram and ensure connections are correctly arranged for the strip and controller.

Match the Power Supply and Controls

Select a power supply with the same nominal output voltage as the strip and a rated capacity appropriate to the calculated load and installation conditions. Do not assume that a dimmer, controller, or connector is compatible just because its voltage marking matches. Verify current capacity, dimming method, polarity, and any manufacturer guidance on load margin. For a large or permanent installation, have a qualified professional check the complete circuit design rather than sizing components from strip length alone.

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Installation Process

Confirm the layout. Measure the full route and identify corners, joints, feed locations, and access points before cutting. Check the strip’s cut marks and minimum bend or handling guidance in the product instructions. Make sure the proposed 20m route can be installed without stretching or sharply folding the strip.
Prepare the mounting surface. The surface should be suitable for the adhesive backing and clean according to the supplier’s instructions. If the design uses an aluminum profile, confirm that the strip width and profile dimensions are compatible. A profile can also provide a defined mounting surface and help protect the strip, but its suitability depends on the product and project conditions.
Plan and verify electrical connections. Identify the power supply, controller if required, and each approved injection point before fixing the strip in place. Check polarity and connection security, and use components rated for the expected current and installation environment. Keep all electrical work within the competence and authorization required for the project.
Test before final assembly. Energize the strip according to the manufacturer’s instructions and inspect the entire run for consistent operation. Check for unexpected dimming, flicker, loose connections, or color variation before closing channels or concealing wiring. Disconnect power before making adjustments.

Application Matching and Selection Framework

A 20m COB LED strip may suit coves, display shelving, reception areas, joinery, and other indoor applications where a continuous line of light is desired. Suitability depends on the required brightness, viewing distance, installation profile, and the project’s control system. For task lighting, review actual lumen output and the planned optics rather than selecting by visual appearance alone. For decorative lighting, confirm that the color temperature and dimming behavior meet the design intent.

Questions to Resolve Before Ordering

Is the requested length one continuous run or a total quantity divided into shorter sections?
What voltage, wattage per metre, lumen output, CCT, and CRI does the project require?
Which feed arrangement and maximum run length does the supplier approve for the selected model?
Will the strip operate with the specified power supply, dimmer, or control system?
Do the profile, connectors, cut points, and mounting method match the installation?

Pricing, MOQ, and Lead-Time Considerations

Pricing for a 20m COB LED strip depends on the selected electrical and optical specifications, construction, customization, and order quantity. Minimum order quantities and lead times can also vary with model availability, production scheduling, and whether custom options are requested. These details should be confirmed in a current quotation rather than assumed from a generic product description. When requesting pricing, provide the target length, project quantity, destination, required specifications, and expected delivery window.

Supplier Evaluation Checklist

A suitable supplier should be able to provide a model-specific datasheet and explain how the stated power and voltage relate to the proposed 20m configuration. Ask for wiring guidance, compatible power supply and control recommendations, cut-point information, and any installation limitations. If your project requires custom color, length, packaging, or labeling, confirm what is available and whether it changes MOQ or lead time. Review the quotation against the same specification set so that competing offers can be compared fairly.

Key Takeaways and Next Steps

A 20m COB LED strip is not a complete electrical specification: successful selection depends on the model’s voltage, W/m, light output, dimensions, and approved power-feed plan. Calculate the load from the actual datasheet, and do not assume that one-end powering will provide even illumination across the run. Confirm controls, mounting, and environmental suitability before purchase, then test the installation before concealing it. For a project quotation, send ENTA Lighting your target quantity, required performance, installation layout, and control details so our team can help identify a suitable configuration and clarify supply options.