The working temperature of LED lamp is below 65℃. The temperature is mainly related to the power of the lamp bead, radiator and lamp bead. In addition, it is also necessary to judge whether the lamp cup radiator matches the lamp bead. Too high temperature can easily lead to serious pearlescent failure of lamps, and even bring security risks. Generally, when the bulb reaches thermal balance, the pin temperature of the bulb is not higher than 65℃, and the surface temperature of the radiator is not higher than 55℃, which is a qualified product.
Overview:
Conductor light-emitting diode (LED) lamp is a semiconductor solid-state light-emitting device. It uses a solid semiconductor chip as a luminescent material, which releases excess energy through the recombination of carriers in the semiconductor, causing photon emission and directly emitting red, yellow, blue, green, cyan, orange, purple and white light. LED lighting products are lighting appliances made of LED as light source.
Luminous principle
The terminal voltage of PN junction constitutes a certain barrier. When a forward bias voltage is applied, the barrier drops and most carriers in the P and N regions diffuse with each other. Because the electron mobility is much greater than the hole mobility, a large number of electrons will diffuse to the P region, forming a minority carrier injection P region. These electrons recombine with holes in the valence band, and the energy obtained in the recombination process is released in the form of light energy. This is the principle of PN junction luminescence.
App application
The application of (1) display screen and traffic signal display light source. LED lamps have the characteristics of earthquake resistance, quick light response, power saving and long service life, and are widely used in various indoor and outdoor display screens, which are divided into full color, double color and monochrome display screens. The traffic lights mainly use ultra-high brightness red, green and yellow LEDs, which are energy-saving and highly reliable, so the traffic lights are gradually updated.
(2) Application in automobile industry Automobile lamps include dashboard, audio indicator, switch backlight, reading lamp, external brake lamp, taillight, side lamp, headlight, etc. LED has fast response speed, which can remind drivers to brake as soon as possible and reduce rear-end collision accidents.
(3) LED is used as LCD backlight. LED backlight has the characteristics of long life, high luminous efficiency, no interference and high cost performance, and has been widely used in electronic watches, mobile phones, BP machines, electronic calculators, credit card readers and other fields. With the miniaturization of portable electronic products, LED backlight has more advantages.
(4)LED lighting source replaces traditional lighting lamps. This substitution trend has begun to involve indoor and outdoor, commercial lighting, road industrial lighting and so on.
(5) Other applications, such as mobile phones, digital players, computers, radios and other electronic products. For example, a kind of flashing shoes that are very popular with children, the built-in LED will flash when walking.
The cause of death ray
There are two main reasons for LED dead light:
(1) The leakage current of LED is too large, which leads to the failure of PN junction and makes the LED light point not bright. This situation generally does not affect the work of other LED lamps;
(2) The internal connection lead of the LED lamp is disconnected, which leads to the dead LED lamp due to no current flowing, which will affect the normal work of other LED lamps.
shopping tips
(1) cost. From the cost point of view, the price of LED lamps is about 3- 10 times that of traditional lamps. It is cost-effective if the electricity consumption time is more than 6 hours every day. It is estimated that you can save money on buying lamps around 1 year. If you spend 2-3 hours a day, you won't save much electricity.
(2) value. Of course, people's life is not just for money. Pursuing fashion and accepting new things is also an attitude towards life.
(3) quality. After you decide to buy LED lights, you need to see what quality LED lights you need.
(4) After-sales service. It's best to ask the agent before buying, how long is the warranty period of LED manufacturers. Some poor products are only guaranteed for one year, which is similar to the life of traditional energy-saving lamps, and the price is still expensive and uneconomical.
(5) The other is the choice of product function. For example, led ceiling lamp (also called LED spotlight) and LED grid lamp are spotlight products, which are mainly used to highlight local lighting. According to the light efficiency requirements, lenses with different angles such as 5 degrees, 15 degrees, 30 degrees and 60 degrees can be customized. LED downlight is the product of floodlight, and its main function is lighting. LED strip is mainly used for auxiliary lighting effect. Compared with the common T5 lamp, it can be used in arc-shaped places, such as the ceiling, in addition to saving electricity.