There are also many kinds of materials for downlight lampshades, including iron surface, pure aluminum, die-cast material, etc. Generally speaking, iron-faced tube lights are cheaper, while those made of pure aluminum and die-cast materials are more expensive but more durable. Iron-faced downlights are commonly used in engineering, but it is recommended to use rust-free covers for household downlights.
The downlight radiator is an important component, and the main material of the radiator is die-cast aluminum. Another thing is the power cord for the lighting fixture. Good brands use three-wire wiring lamp holders (three wires, namely live wire, neutral wire, and ground wire), and some also come with terminal blocks or connectors. This is also the basic way to distinguish good brands from regular brands.
Reflective cups generally come in two types: sand cups and light cups, which are made of aluminum material that does not discolor and has good reflectivity. Some small manufacturers will use plastic spraying to make them. This new process looks great, but after a while, it will dull or even turn black. The identification method is to check the smoothness of the cutting area. Aluminum cuts neatly, while spray painting does the opposite.