First, the price of intelligent voice-activated desk lamp
The intelligent voice-activated desk lamp of Guangzhou Haogeji Arts and Crafts Co., Ltd. costs 6 1 yuan.
Guangzhou Tuoke Trading Co., Ltd. Intelligent voice-activated desk lamp price 55 yuan.
The price of intelligent voice-activated desk lamp of Jingdezhen Fang Yi Ceramics Co., Ltd. is 69 yuan.
Online quotation? for reference only
Second, the introduction of table lamp classification
1, high frequency lamp
The alternating current of China power grid is 50Hz, and its voltage waveform changes 50 times per second. The frequency of voltage amplitude change is twice that of voltage waveform change, that is, 100 times per second. The brightness of a fluorescent lamp (fluorescent lamp) that uses alternating current directly changes with the voltage amplitude at both ends of the lamp, so it will flicker. The flicker frequency is the same as the voltage amplitude change frequency, which is 100 times/second. The main changes that human eyes can perceive are within 30Hz. Although the light changes alternately 100 times per second, it will not be noticed by us, and these flashes have an impact on the human eye. If it is very bright, the pupils in the eyes will contract; When the light is dim, the pupils will be dilated. Therefore, fluorescent lamps that use alternating current directly are harmful to the eyes.
Electronic frequency converter is used in high-frequency lamps (such as energy-saving lamps) to change 50Hz alternating current into high-frequency alternating current (generally 30-50 kHz), and then light the lamps with high-frequency alternating current. In high-frequency lamps, light changes tens of thousands of times per second. Because the human eye can't change with it, it can't feel the change, so it's "unchanged" to protect the eyes. The driving circuit of high-frequency lamp will have 30-50kHz electromagnetic signal. Some people claim that it is harmful to human body, but there is no specific report or data to prove it, which needs further research and verification.
2. Electric light
The spectra of ordinary incandescent lamps and halogen lamps are continuous and close to the natural spectrum, so they are actually a kind of "eye protection lamp". Moreover, because alternating current heats the filament first, the filament heats first and then emits light. Because the filament has heat capacity, it is still hot when the power supply changes, and the change of light and shade is not as obvious as that of fluorescent lamp (fluorescent lamp), but the energy efficiency of incandescent lamp is very low. Incandescent lamps over 60W have been listed as obsolete commodities by the state. Halogen lamp is an improved version of incandescent lamp, in which trace halogen elements are added to the filled inert gas. Compared with ordinary incandescent lamps, halogen lamps have the advantages of small size, high luminous efficiency and long life.
3. LCD desk lamp
UIVOLED lighting is powered by low-voltage DC, which is basically free of stroboscopic light and blue ultraviolet damage, and can be used to manufacture large-area organic light-emitting diode panels, which is a key research plan in China. Organic light-emitting diode lighting does not need to heat the filament to several thousand degrees Celsius to emit light, nor does it need to use mercury vapor to generate ultraviolet light to excite the phosphor to emit light. Because there is no multiple conversion process of electric energy, organic light-emitting diode lighting saves about 60% to 70% of electric energy compared with current energy-saving lamps. More importantly, organic light-emitting diode lighting will not produce pollution during production and use [2]. This eliminates the risk of environmental damage caused by the current use of mercury in energy-saving lamps. It is understood that the mercury content of 1 ordinary energy-saving lamps is about 5 mg, which can pollute hundreds of tons of water once it seeps into the ground. Mercury can volatilize at room temperature, and the mercury concentration in the surrounding air can instantly exceed 100 after the abandoned energy-saving lamp tube is broken. Once the mercury entering the human body exceeds the standard, it will destroy the central nervous system and even lead to death. Hundreds of millions of mercury-containing lamps are scrapped every year in China, and the amount of mercury released into the atmosphere and water environment due to improper disposal is as high as dozens of tons.
Today, I not only recommended the price information about intelligent voice-activated desk lamps, but also introduced the common classification of desk lamps. From this, we can know that the price of intelligent voice-activated desk lamps is not very expensive, and some of them are cheap replacement series launched by very popular brands. In addition, we can also know that desk lamps can be divided into high-frequency lamps and so on, especially electric lamps and ordinary white baked bulbs, which are small in size, high in light efficiency and long in life, and have been widely used now. For the purpose of beauty, interested friends combine the above to understand and analyze.
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