LED desk lamp is a table lamp with LED (LightEmitTIngDiode) or light-emitting diode as the light source. LED is a solid-state semiconductor device, which can directly convert electricity into light. The LED lighting technology used is the third generation lighting technology. The use of blue light from LED desk lamps can cause eye damage, but it also has a number of advantages.
LED table lamp disadvantages:1, monochromatic light source, the chromatogram is too narrow, it will affect the optic nerve of the eye, easy to fatigue
2, the price is more expensive, compared to other light sources, the price is generally higher.
3, LED lamps due to low entry threshold, which also includes some unqualified products, the domestic lack of relevant quality testing methods, mainly based on quality testing in developed countries as the standard.
4, LED small lamp beads, after a few years of use will slowly wear out and can not be replaced, easy to cause the entire table lamp scrapped
5. The LED eye protection lamp with poor workmanship will produce slight stroboscopic and radiation.
6, the adapter is generally shorter than the LED small lamp bead, the transformer is easier to break
1, the direction of the light source is good, on-demand lighting, as an emergency table lamp is better
2, sufficient illumination to meet your general lighting needs
3, DC power supply, good workmanship, no stroboscopic, no electromagnetic radiation
4, green, energy efficient
5, solid light source, anti-mechanical vibration
6, no ultraviolet light, no infrared
7, LED small lamp beads have a long life
The working principle of LED table lamp follows the design concept of safety first civil electrical appliance. LED light source is a kind of low-voltage DC constant current source light-emitting device, which can not be directly lit with 100-220V AC high-voltage electricity. Therefore, LED desk lamp scheme The design idea is to first convert the high-voltage AC power into a low-voltage DC constant current source to illuminate the LED light source. Using the most cost-effective way to step down and perform AC-DC conversion is the primary consideration in design. Today's portable electronic products use AC power supply AC-DC buck converter - adapter (Adaptr) is both economical, ready-made, and A good choice. The output voltage of the adapter needs to be stable at DC12V. The output current should be selected according to the power of the LED light source. Generally, a margin of 30% should be given. Take the white LED light source of 3&TImes; 1W as an example. The standard working current of the 1W white LED should be It is 350mA, so the current required for the circuit connection of 3 LED light sources is also 350mA. Considering the extension of LED life and reducing the light decay, it can be designed to be 300mA~330mA, which will not obviously affect the brightness of LED illumination, so the output current of the adapter should be Choose 750mA ~ 1A.
Second, COB table lamp introductionThe COB table lamp is a lighting device with a current of 500MA and a power of 6W.
COB table lamp technical parameters:Voltage: DC13-16V
Current: 500MA
Power: 6W
Light efficiency: 70-90Lm/W
Color temperature: 3000-6500K
Color rendering index: 80-90
Working temperature: -20 ° C -60 ° C
Life: more than 30,000 hours
200*300mm Anti-Blue Light Screen Protector
The Imported Anti-Blue Light For ipad is made of high-quality imported TPU material. It is precisely cut by the Screen Protector Cutting Machine. Protect your device screen from scratches and cracks. The flexible TPU Screen Protector can completely cover the iPad screen, providing the maximum protection for the iPad.
Advanced blue light blocking technology can protect your eyes, can effectively filter blue light, prevent glare, reduce eye fatigue, and help you fall asleep better.
Super clear and transparent, will not reduce the screen brightness, maintain the original screen brightness, and reduce eye fatigue.
The Protective Film adopts an oleophobic and waterproof coating, which can ensure anti-fingerprint, waterproof, dustproof and no air bubbles. Moreover, it is sensitive to touch, bringing natural touch, fast response and flawless precise touch.
If you want to know more about Imported Anti-Blue Light For ipad products, please click product details to view the parameters, models, pictures, prices and other information about Imported Anti-Blue Light For ipad products.
Whether you are a group or an individual, we will try our best to provide you with accurate and comprehensive information about Imported Anti-Blue Light For ipad!
Imported Anti-Blue Light Protective Film, Imported Anti-Blue Screen Protective Film, Imported Anti-Blue Screen Protector, Imported Anti-Blue Light Screen Protector
Shenzhen Jianjiantong Technology Co., Ltd. , https://www.jjtphonesticker.com