How to Choose an LED Strip Power Supply and Controller
How to Choose an LED Strip Power Supply and Controller
Learn LED strip power supply in simple terms. The power supply and controller must match the strip voltage, total load, channel type and environment. This guide includes selection checks, common mistakes and relevant Whitehouse product examples.
Quick answer: The power supply and controller must match the strip voltage, total load, channel type and environment.
Why this matters
Customers often reach a product page after searching for one specification, but the correct result depends on how several specifications work together. Understanding the terms below helps prevent incompatible purchases, poor light quality and unnecessary replacement costs.
- A driver converts the incoming supply to the voltage required by low-voltage strip lighting.
- Controller type must match single-colour, tunable-white, RGB or RGBW strip configuration.
- Total power is calculated from watts per metre multiplied by installed length, with appropriate design margin.
- Long runs may need power injection or multiple feeds to reduce voltage drop.
How to choose the right product
- Read the strip voltage and watts-per-metre rating.
- Calculate the total connected wattage.
- Choose a controller with the correct number of channels.
- Provide ventilation around drivers and keep them accessible.
- Use outdoor-rated enclosures and connectors where moisture is present.
Relevant products from the Whitehouse range
The examples below were selected from active, in-stock products in the latest Whitehouse Lighting & Electrical catalogue. They are examples rather than universal substitutes: always match the exact base, voltage, dimensions, rating and application.
WHL&E Single Strip Light Power Supply
Whitehouse Lighting And Electrical — a relevant active catalogue option. This product was active and in stock in the latest catalogue reviewed for this article. Confirm the current product page specifications and availability before ordering.
WHL&E R4-11 220V RGB Remote And Power Supply
Whitehouse Lighting And Electrical — coloured-light control. This product was active and in stock in the latest catalogue reviewed for this article. Confirm the current product page specifications and availability before ordering.
WHL&E 220V RGB Remote + Power Supply
Whitehouse Lighting And Electrical — coloured-light control. This product was active and in stock in the latest catalogue reviewed for this article. Confirm the current product page specifications and availability before ordering.
Common mistakes to avoid
- Choosing a supply only by physical plug shape.
- Loading a controller to its absolute maximum without margin.
- Hiding a driver where it cannot dissipate heat or be serviced.
Frequently asked questions
Can one power supply run two strips?
Yes, if voltage, wiring and total load are correct and within the supply rating.
Why is the far end of a strip dimmer?
Voltage drop increases with current, conductor resistance and run length.
Can an RGB controller run a white strip?
Not necessarily. Controller and strip channel configuration must match.
Shop with the specification in mind
Start with the technical requirement, then compare finish, brand and price. Whitehouse Lighting & Electrical supplies lighting, solar and electrical products for homes, contractors and businesses throughout South Africa. Use the linked product pages above or contact the team with a clear photograph of the existing fitting, label or installation requirement.
Related reading: LED vs filament bulbs and LED Strip Profiles, Diffusers and Heat — Why Installation Quality Matters
Technical references
- Victron Energy: Wiring Unlimited — DC wiring and voltage drop
- Signify Lighting Academy: lighting theory essentials
Product availability and specifications can change. Verify the current product page and manufacturer documentation before purchase or installation.