(1) Different color temperatures

Cold white: the color temperature above 7000 k is cold white, warm white: 2700 k is warm white, and sunlight white: 6000 k is positive white.

(2) Different brightness

Cold white light source is close to natural light, which has a bright feeling and makes people concentrate; Warm color light is similar to incandescent lamp, with more red components, giving people a warm, healthy and comfortable feeling; Positive white light source is close to natural light, which makes people pay attention.

(3) the scope of application is different

Cold white is suitable for offices, conference rooms, classrooms, living rooms, design rooms, library reading rooms, exhibition windows and other places. Warm white is suitable for families, houses, dormitories, hospitals, hotels and other places, or places with relatively low temperature. White suits the office.

The so-called led lamp, as its name implies, means that the lamps adopt LED (Light Emitting Diode) technology as the main light source.

LED is a solid semiconductor element, which uses current to flow forward to the junction of semiconductor p-n junction, and then the negatively charged electrons and positively charged hole carriers separated from the semiconductor combine with each other to produce photon emission. Different kinds of light-emitting diodes can emit different wavelengths of light, from infrared light to blue light, from purple light to ultraviolet light.

Extended data:

In recent years, the new development is to coat fluorescent powder on blue LED, and convert blue LED into white LED products. This operation generally needs to cooperate with the driving circuit (LED driver) or power supply. The main function of driving circuit or power supply is to convert AC voltage into DC power, and at the same time complete the voltage and current consistent with LED to drive the matching components.

LED light bulbs are small in size, light in weight, encapsulated by epoxy resin, can withstand high-strength mechanical shock and vibration, are not easy to break, and have a long brightness decay period, so the service life can be as long as 50,000-100000 hours, far exceeding that of traditional tungsten light bulbs10000 hours and fluorescent lamps10000 hours.

Because the service life of LED lamps can reach 5 ~ 10 years, it can not only greatly reduce the replacement cost of lamps, but also drive the lamps with a small current. Under the same lighting effect, the power consumption is only half that of fluorescent tubes, so LEDs also have the advantages of saving electricity and energy.

However, there are still some shortcomings in some LED technologies, so the shortcomings of using LED lamps at first are poor light quality (color rendering, consistency and color temperature), difficult heat dissipation, high price, and improper heat dissipation will lead to accelerated attenuation of the brightness of LED lamps and the service life of circuit components.

Reference source: Baidu Encyclopedia -LED lights