flameless candle lights
The discovery and use of fire has great significance for the development of human and society.In the old Stone Age, ancient humans first knew and mastered fire, enhancing their ability to survive in cold climates.Fire can barbecue food, can be used to hunt and defensive beast, can lighting, dry wet thing and turn ice into water, friction fire first dominated a force of nature, and ultimately to separate people with the animal kingdom.
At the time of the human memory, the flame has been the first and only an artificial light source, it guides our ancestors over millions of years of history, came to today, and became the us now.Our passion for the sport of fire and warmth is woven into the brain, and even the advent of electric light does not diminish our love for candlelight - it has a special effect on us.
In the rapid development of modern technology, led candle lights appear.led candles not contain mercury, lead and other heavy metals pollution to the environment a big, light will not produce ultraviolet ray, so the lamps and lanterns of electric candles are not as traditional as there are a lot of mosquitoes around near the light source to make the environment more clean and who clean;The innovative design of metal shell constant-current drive makes the conversion of electrical energy into light efficiency very high.
(1) energy saving: the spectrum of battery candles is nearly all concentrated in the visible light band, and its luminous efficiency can reach 80-90%.The author will also LED lights with ordinary incandescent lamp, spiral energy-saving lamps T5 trichromatic fluorescent lamps and done some comparison, the result shows: the ordinary incandescent light efficiency of 12 lm/w, life is less than 2000 hours, spiral energy-saving lamp luminous efficacy of 60 lm/w, life is less than 8000 hours, T5 fluorescent lamp is 96 alm/w, life is about 10000 hours, and a diameter of 5 mm white LED to 20-28 lm/w, life can be greater than 100000 hours.It is also predicted that future LED lifetime limits will be infinite.
(2) safe and environment-friendly: the working voltage of the battery operated candles is low, which is 1.4-3v;The normal LED working current is only 10mA, and the ultra-high brightness is only 1A.Leds don't add "mercury" in the process of production, also do not need air, do not need glass shell, good impact resistance, good shock resistance, invulnerability to breakage and facilitate transportation, very green, known as "green energy".
(3) long service life: the LED is small in size and light in weight, and the outer shell is encapsulated by epoxy resin, which not only protects the internal chip, but also has the ability to light the light.LED life is generally between 50,000 and 100,000 hours, because leds are semiconductor devices, and even frequent switches do not affect service life.Nowadays, the main use of household lighting is incandescent lamp, fluorescent lamp and energy-saving fluorescent lamp.
(4) fast response: LED the response frequency f tau and minority carrier injection of tau MC about life, such as GaAs material made of LED, the tau MC generally range between 1-10 ns, the frequency response of about 16-160 MHz, such a high response frequency for video signal display 6.5 MHz is enough, this is one of the key factors to realize video LED large screen.
(5) high luminous efficiency: the light effect of incandescent lamp and halogen tungsten lamp is 12-24lm/w(lumen/watt), the light efficiency of fluorescent lamp is 50-70lm /w, the light effect of sodium lamp is 90-140lm /w, and most of the electricity consumption turns into heat loss.And the light effect of LED can reach 50 -- 200lm/w, and the monochromaticity of light is good and the spectrum is narrow, and the color visible light can be directly emitted without filtering.
(6) small size of LED components: it is more convenient for the layout and design of various devices, and can better realize the effect of "no light source" in nightview lighting.