T5 vs T8 LED Tube Lights: Wattage, Sizes and Replacing Fluorescent Tubes

If you are sourcing LED tube lights for offices, supermarkets, warehouses, or retail spaces, the choice usually comes down to two formats: T8 LED tube lights and T5 LED tube lights. Both replace traditional fluorescent tubes, but they differ in size, wattage, and installation approach. This guide answers the questions buyers ask most: what T5 and T8 tubes are, how they compare, what wattage to choose, and how to change a fluorescent tube to LED.

What are T8 and T5 LED tube lights?

The “T” number refers to the tube diameter in eighths of an inch. A T8 LED tube light has a diameter of 1 inch (8/8”), while a T5 LED tube light is 5/8 inch. T8 is the most common replacement for standard fluorescent fixtures in commercial buildings. T5 is slimmer and often used in newer or space-constrained fixtures.

Both types are available as integrated tubes, meaning the LED driver is built into the tube itself. This simplifies installation—no external driver or rewiring of the fixture’s internal electronics is usually required. Enshine offers integrated T8 LED tubes and integrated T5 tubes, as well as T8 glass tubes for buyers who prefer glass construction.

T5 vs T8: key differences

For a buyer, the main differences are physical size and the fixture type they fit. T8 tubes fit the most common commercial troffer and strip fixtures. T5 tubes are narrower and require T5-specific fixtures or adapters. Here is a direct comparison:

Both Enshine T8 and T5 integrated tubes support linkable installation, which lets you connect multiple tubes in a row without extra wiring—useful for long runs in warehouses or retail aisles. Both also include pins protection to prevent damage during handling and installation.

LED tube light wattage: what to choose

Wattage determines brightness and energy consumption. For T8 integrated tubes, Enshine offers 6W to 40W. The right choice depends on the room height, fixture spacing, and the brightness level you need.

• 6–12W: Suitable for task lighting, corridors, or smaller spaces.
• 15–20W: Common for office ceiling fixtures and retail displays.
• 25–40W: For higher ceilings, warehouses, and areas needing strong illumination.

Because LED tubes produce more lumens per watt than fluorescent, a lower-wattage LED tube can often replace a higher-wattage fluorescent tube while maintaining similar brightness. For example, a 20W LED T8 can typically replace a 32W fluorescent T8. Always compare lumen output, not just wattage, when making substitutions.

Enshine T8 tubes feature a patented chip design and a good heat sink, which contribute to high lumen efficiency—meaning more visible light per watt consumed. This matters for buyers calculating energy savings across a large facility.

How to change fluorescent tubes to LED

Replacing fluorescent tubes with LED is straightforward when you choose integrated LED tubes. Follow these steps:

1. Turn off power to the fixture at the circuit breaker.
2. Remove the fluorescent tube by rotating it 90 degrees and pulling it down from the sockets.
3. Remove the starter (if present) from the fixture. Integrated LED tubes do not need a starter.
4. Insert the LED tube into the sockets, aligning the pins with the slots. Rotate it 90 degrees to lock it in place.
5. Restore power and test the light.

For fixtures with magnetic ballasts, you may need to bypass the ballast. This is a simple wiring job but must be done by a qualified electrician to ensure safety and code compliance. Enshine integrated tubes are designed for easy installation, but always confirm the specific wiring requirements with your supplier before ordering.

Additional features to consider

For certain applications, you may want more than basic lighting. Enshine T8 and T5 tubes can be specified with:

• 5.8G microwave module auto-sensing: The light turns on when motion is detected and dims or turns off after a set time—useful for warehouses, corridors, and parking areas where lights are not always needed.
• AC switch three color temperature switching: Allows you to change between color temperatures (e.g., 3000K, 4000K, 6500K) using the wall switch, without changing the tube.

These options add functionality but also add cost. Evaluate whether your project actually needs them before specifying.

For related linear lighting options, see our LED batten light buying guide and guide to waterproof batten fixtures.

FAQ

Can I put a T8 LED tube in a T5 fixture?

No. T8 and T5 tubes have different diameters and pin spacing. They are not interchangeable without changing the fixture or using an adapter. Always match the tube size to the fixture.

What is the wattage of a standard T8 LED tube?

Enshine T8 integrated tubes range from 6W to 40W. The most common commercial choices are 15W, 18W, and 20W for standard ceiling fixtures.

Do I need to remove the ballast to use LED tubes?

With integrated LED tubes, the ballast is not needed. In most cases, you can either leave it in place (if the tube is designed for ballast compatibility) or bypass it. Check the product specifications and consult an electrician.

Are T5 LED tubes more energy-efficient than T8?

Efficiency depends on the specific tube, not just the diameter. Both T5 and T8 LED tubes can achieve high lumen efficiency. Compare lumen output per watt for the specific models you are considering.