Cold light source: A cold light source is a light source (firefly, neon, LED, etc.) that is excited by chemical energy, electrical energy, or biological energy. Has a very good optical, flashing characteristics. When an object emits light, its temperature is not higher than the ambient temperature. This kind of illumination is called a cold light source. For example, an LED uses a combination of electron-hole pairs to emit light. Strictly speaking, LED light-emitting diodes are electroluminescence and heat generation, but they are lower than light sources such as incandescent lamps. The LED electro-optical conversion efficiency is about 30%, of which the internal quantum efficiency is about 70% (close to the theoretical limit), and the external quantum efficiency is about 50%. (This is just experimental data, not an exact value)
Thermal light source: A light source that is excited by thermal energy, such as an incandescent lamp that emits heat at a temperature of 3,000-4,000 K. Incandescent lamps have 80-90% energy conversion energy, and about 10% energy is converted into light energy. Therefore, the luminous efficiency is low. We are not defined as a cold light source or a thermal light source depending on the temperature of the lamp housing.
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The RJ-45 interface can be used to connect the RJ-45 connector. It is suitable for the network constructed by twisted pair. This port is the most common port, which is generally provided by Ethernet hub. The number of hubs we usually talk about is the number of RJ-45 ports. The RJ-45 port of the hub can be directly connected to terminal devices such as computers and network printers, and can also be connected with other hub equipment and routers such as switches and hubs.
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