LED T8 Tube Sizes โ 2FT, 4FT and 5FT Replacement Guide
LED T8 Tube Sizes โ 2FT, 4FT and 5FT Replacement Guide
Learn LED T8 tube sizes in simple terms. Match the tube length, cap, wiring method and fitting compatibility before replacing fluorescent tubes with LED. This guide includes selection checks, common mistakes and relevant Whitehouse product examples.
Quick answer: Match the tube length, cap, wiring method and fitting compatibility before replacing fluorescent tubes with LED.
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.
- T8 tubes commonly use a G13 two-pin cap, but length and electrical design still vary.
- Nominal 2FT, 4FT and 5FT descriptions are convenient retail terms; confirm the actual fitting length.
- Some LED tubes are intended for direct mains wiring, while others may work with specific control gear.
- Clear and frosted tubes can distribute light differently and affect glare.
How to choose the right product
- Measure the existing tube and read the printed code.
- Confirm the G13 cap and the manufacturer's wiring method.
- Check whether the fitting is single-ended or double-ended supply.
- Use frosted tubes where direct glare is a concern.
- Replace ageing lampholders and damaged fittings rather than forcing a retrofit.
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.
Flash 9W LED 2FT Clear T8 Tube 6500K
Flashโข โ linear LED tube format. 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.
Flash 18W LED 4FT Frosted T8 Tube 6500K
Flashโข โ linear LED tube format. 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.
Flash 22W LED 5FT Frosted T8 Tube 6500K
Flashโข โ linear LED tube format. 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
- Assuming every LED tube works with the existing ballast.
- Buying a 4FT tube based only on visual estimation.
- Installing a tube without following the wiring diagram supplied with that product.
Frequently asked questions
Can I put an LED tube straight into a fluorescent fitting?
Only when the lamp and fitting arrangement are compatible. Follow the tube manufacturer's instructions.
What is G13?
It is the common two-pin cap used by many T8 tubes.
Clear or frosted tube?
Clear optics may look more intense; frosted tubes usually soften the appearance and reduce visible LED points.
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: E27 vs B22 vs E14 vs GU10 bulb-base guide and Converting Fluorescent Fittings to LED Tubes โ What Must Be Checked
Technical references
- Signify South Africa: CorePro LED T8 tube specification
- NRCS Electrotechnical compulsory specifications
Product availability and specifications can change. Verify the current product page and manufacturer documentation before purchase or installation.