1LED whistle flashlight, keychain flashlight

A: is located in Ningbo, Zhejiang Ninghai Ying Dadianqichang dawn Mountain Spa Resort location, near one of the high-speed track with two vertical and three national 16KM. From the Ningbo Airport 60KM. Beilun port 70KM. Convenient traffic. The factory is specialized in the production of aluminum flashlight 1W.3W.5W .LED flashlight Opener tiger buckle whistles series of enterprises. With its own development, manufacturing, assembling one-stop production line, a variety of metal flashlight design, handsome in appearance. Products are exported to Europe, America and Southeast Asia and other countries and regions. Our "quality and reputation, customer satisfaction for the purpose", dedicated to provide quality services for Chinese and foreign customers, warmly welcome big businessmen here guidance and call letter. Two: The appearance of the product compact, easy to carry, can be used as home, field of use, can be used as gifts, gifts to send to friends, colleagues and other products Color Limited, can be any combination, the surface can LOGO! Packaging can be according to customer requirements, welcomed the new and old customers to order! 3: Product Features 1. Super super bright LED 2. adopt a non-slip surface design aluminum alloy 3. Product Specifications: Model YDS1L001 Packing PP bags * White box Carton Size 30 * 23 * 24CM 500PCS / box gross weight 13.5 / 13KGS price :( without batteries) Product Description Material: Aluminum Size: 92 * 14MM Weight: 25.5 g Battery: 4 * AG3 Main product or service: LED flashlight; aluminum flashlight; Opener; metal key chain; Industry: LED flashlight business model: production and processing enterprises Type: self-employed Company registration: China Ningbo, Zhejiang principal place of business: Ningbo Company Established: 2002 Legal Representative / CEO: 张东寅 annual turnover: 10,000,000 yuan / - 20 million / year Number of employees: 51--100 people operating brands: Indah registered capital: no verification main customer groups: Trading Company Main Market: Japan, North America, South America, the world, with annual exports: 7,000,000 yuan / - 10 million / annually imports: 500,000 yuan / year - 100 million / year Bank: Agricultural Bank of China account: 6228480310192449414 Whether to provide OEM service? The number of R & D department: 5 - 10 persons Monthly output: 300,000 Area: 5000 square meters of quality control: third-party management system certification attached: aluminum flashlight is the light-emitting diodes as a light source of new lighting tool, it has a power , durable, brightness and other advantages. (A) LED light-emitting diode emitting principle is Ⅲ-Ⅳ compounds, such as GaAs (gallium arsenide), GaP (Gallium Phosphide), GaAsP (gallium arsenide phosphorus) and other semiconductor made of, its core is the PN junction. IN feature so that it has a general PN junction that is forward, reverse blocking, breakdown characteristics. In addition, under certain conditions, it also has luminescent properties. In the forward voltage, electrons from the N zone injection P area, hole injection from the P District N District. Into other areas of minority carriers (minority) part of the majority carriers (many children) composite and light, as shown in FIG. Assume emitting occurred in the P region, the injected electrons and valence band holes direct composite and light, or light-emitting center was first captured, then with the hole recombination. In addition to this light-emitting compound, some electrons are (between the center of the conduction band, dielectric belt near the middle) non-luminescent center to capture, and then with the hole recombination, each time the energy released is not, can not form visible. Emitting composite volume relative to non-emitting composite volume ratio, the higher quantum efficiency. Since the compound is in the minority carrier diffusion area glowing, so light produces only near PN junction within several μm. Theory and Practice shows that the peak wavelength λ of the light band gap semiconductor material emitting region Eg about that λ≈1240 / Eg (mm) where Eg units of electron volts (eV). If you can produce visible light (wavelength of 380nm violet ~ 780nm red), Eg of semiconductor materials should be between 3.26 ~ 1.63eV. Longer wavelength than the red light to infrared light. Now there are infrared, red, yellow, green and blue light-emitting diodes, but blue-light LED cost, the price is high, use not common. (B) the characteristics of the LED 1. Limit the significance of parameters (1) to allow power Pm: allows you to add to the positive DC voltage across the LED with a maximum current flowing through it the product of. More than this value, LED fever, damage. (2) The maximum forward current IFm: allows you to add the maximum forward current. Exceeding this value can damage the diodes.  (3) The maximum reverse voltage VRm: the allowed maximum reverse voltage applied. More than this value, the light emitting diode may be breakdown.   (4) working environment topm: light-emitting diodes with a working temperature range. Lower or higher than this temperature range, the LED will not work, efficiency is greatly reduced. How to buy high-power LED flashlight (for reference only): 1, number spectacle, the first few to moderate. Household generally not more than 12, use the battery in the 2 to 3 as well, and then a little big waves for other special needs may need to set ourselves. Of course, high-power Hight Power LED Flashlight generally can not reach the number of 12. 2, see welding, soldering to prison. Each diode is connected to the circuit board by soldering, if Weld a bad contact, it may cause bulb does not light or affect the overall use. 3, see the battery, there are two kinds of ordinary batteries and lithium, although lithium is a rechargeable battery, but the low life, about 2 years, LED life of about 10 years, according to the actual situation to choose 4, see brightness, good LED flashlight high brightness, slow decay. 5, see the bulb, when the lamp is off, the naked eye it is difficult to distinguish between good and bad, you can see the consistency in the bulb lit situations. 6, waterproof watch, good LED flashlight with waterproof function, seismic performance, namely ruggedness. Because it is electronic products, flashlights and the front has a board, once the water prone to short circuit, causing damage. 7, see the iris, a good LED flashlight a uniform circular aperture, LED flashlight spot the difference into uneven distribution of yellow and blue. Bulb condenser side try to focus a little. This flashlight like ordinary flashlight can adjust the focus, to look out not to have astigmatism. 8, look at the appearance, you can choose aluminum shell, beautiful and generous.