LED tubes are a solid-state alternative for the fluorescent light tubes commonly found in recessed troffers, signs, walk-in coolers, and other commercial applications. They are pin compatible with standard fluorescent fixtures, and frequently available to replace T8, T10, and T12 sizes of 2, 4 or 8 ft. lengths.
LED tubes are usually considered in these applications for one or more of the following reasons:
- Lower power consumption / higher efficiency
- No glass
- No toxic phosphor or mercury
- Better performance in cold temperatures
- Much longer lifespan / lower maintenance
- Lower heat output
Some LED tubes (such as the LEDdynamics EverLED TR) are designed to drop directly into an existing fixture with no rewiring, while others require the prior removal or bypassing of the ballast. A ballast-compatible approach saves the cost of having to rewire the fixtures, which can drastically reduce conversion costs.
Because LEDs are point light sources, an LED tube is generally made up of many individual LEDs, and a diffuser is used to spread the light out. Unlike a standard fluorescent tube, all light is directed downward from the fixture, so energy is not used to create light in other directions which must then be reflected. The perceived brightness of the EverLED TR is basically identical to that of a standard 34 watt fluorescent tube, using less than 60% of the power.