What material is generally used for the LED tube housing?

LED tube housing can be made of different materials, but the most commonly used materials are plastic and aluminum. 

Plastic housings are typically made of polycarbonate, which is a durable and lightweight thermoplastic material that can withstand high temperatures and is resistant to impact, UV rays, and weathering. Plastic housings are also relatively inexpensive and easy to produce, making them a popular choice for LED tube manufacturers.

Aluminum housings are more expensive than plastic but offer better heat dissipation and durability. They are also more aesthetically pleasing and can be anodized or painted to match different color schemes. Aluminum housings are typically made of extruded aluminum, which is a process that involves shaping the material by forcing it through a die.

Ultimately, the choice of material for LED tube housing depends on the specific needs of the application, such as the level of durability, heat dissipation, and aesthetics required.