Light color is to constitute the basic elements

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The selection of the light source is a direct impact on the artistic effect of the lighting, LED light color displayed on the display lamps art unparalleled advantages; color LED products cover the entire visible spectral range, and the color is good, high color purity, red, green select the yellow led ceiling lights combination of color and grayscale (16.7 million colors) with greater flexibility. The lamp is a luminous sculpture constructed of materials, structure, shape and texture lighting material form, show an important means of art. LED technology allows organic combination of scientific and artistic living room lamp, breaking the traditional lamp Collage frame, beyond the inherent concept of the so-called lamp shape, lighting design in the performance of visual perception and forms of artistic creativity, a new perspective to get to know, understand and express the theme of light. We can be more flexible use of optical technology in light and dark mix of light and color combination of materials, structural design advantages, improve the design freedom to weaken the function of the lamp lighting the lamps become a visual arts to create a comfortable and beautiful art of the light effect . Such as translucent synthetic materials and aluminum candle-like LED lights, can be arbitrarily set aside on the ground, wall or table, the idea of ??simple and easy form to convey the visual experience and the experience of light, the lamps become full of fun and vitality living organisms.

    Fourth, the humane

    Needless to say, the relationship of light and is an eternal topic, "People see the light, I saw the light", is the classic phrase, the words have changed countless designer lamps. The highest state of the lamps is the highest manifestation of the "shadowless" user-friendly lighting, no traces of any common lamp in the room, so that people can feel the light but can not find the light, user-friendly design embodies the perfect combination of light and of human life .

    LED lighting product light, the choice of different light-colored induction lamp into the soft illumination of the various modules, and any installed in the living room, bedroom lighting, the light source may be from the floor, wall, window sills, furniture, accessories and other. Therefore, the next room lighting will no longer be limited to a single lamp, but will be a single lighting into the shadowless lighting apparatus of the overall lighting effect. The different colors of light and brightness to produce different effects on human physiological and psychological can, in many cases do not need a very bright white light may be yellow or other colors of light more suitable for physiological and psychological needs. Three color LED brightness, grayscale and color continuous transformation and selection, making the lighting extended to a variety of colors of light from the white light on the universal significance.

    Therefore, it can be based on the overall lighting needs (su ch as color, temperature, brightness and direction, etc.) to set the lighting effects to achieve the control of human intelligence to create a different interior lighting effect. Living room, only LED light ceilings and luminous walls, the people according to their requirements, the scene, and a different understanding of the environment and living in a different space and time to select and control the brightness of the light, gray scale, color change to simulate a variety of light environment to guide and improve mood, reflect the lighting environment more humane.

Power factor of Brief Introduction of LED lamps

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1, the power factor

The power factor characterizes the ability of the lamp output active power. Power is a measure of the energy transfer rate in the DC circuit voltage V and current A and the product. In th e exchange system is far more complex: that part of the cycle of AC current in the load where transmit power, it is called reactance current or harmonic current, it makes the power (voltage multiplied by current Volt Amps) is greater than the actual power. Leads to the power factor, apparent power and actual power ranging from power factor equal to the actual ratio of the power and apparent power. Exchange systems, the actual power is equal to the apparent power times the power factor : Power factor = real power / apparent power. led high bay lighting load power factor of electric heaters and light bulbs for one, many devices real power and apparent power difference is very small, negligible, like capacitive equipment such as the lighting of this difference is very important. Recent study showed that U.S. PCMagazine magazine lamp typical power factor of 0.65, apparent power (VA) Power (Watts) 50%!

2, the apparent power

As the product of power: AC voltage and AC current. Formula is expressed as: S = UI where S is the rated output power in VA (voltammetry); U is the rated output voltage, the unit is V, 220V, 380V, etc.; I is the rated output current, the unit is A. Apparent power includes two parts: the active power (P) and reactive power (Q). The active power is directly acting the part. Such as to cause the lamp lights up, the motor rotates, so that the electronic circuit work. After doing work of this power into heat, people feel that some people have an illusion, as the active power to apparent power, everyone knows the active power is only apparent part of the power, expressed by equation : p = Scosθ = UIcosθ = the UI? F. where, P is active power, the unit is W (watts); F = cos θ is called the power factor, and θ is the non-linear load voltage and current phase phase. Reactive power is stored in the circuit, but is not directly acting the part of power, expressed as: Q = Ssinθ = UIsinθ. Where, Q is the reactive power, the unit is var (lack of).

(3) reactive power

Lamps and all other electronic circuits rely on DC voltage, leave the reactive power does not work. General users that the lamps and the like devices will require the active power, without the need for reactive power. Since the reactive power is not acting, you want it and where to use! So of course they think that the power factor is one of the lamp. Because it gives the maximum output power. However, the reality is not the case.

A lamp when the AC mains input rectifier, pulsating DC voltage, if the ripple voltage of any processing, it is provided directly to the lamp, no doubt, the circuit did not work. At this time the lamp power factor close to 1, but what use is it. In order for the lighting circuit to work properly, must provide a smooth DC voltage. "Smoothing" must be performed by the filter capacitor connected to the lamp rectifier behind to complete. This filter is like a reservoir capacitor which must be stored a sufficient number of charge, when the gap between the half-wave rectifier circuit voltage remains uninterrupted, able to maintain a normal level. In other words, even if the input electrical energy between two half-wave pulse Uc voltage levels without a significant change, this function is achieved by the energy storage capacitor to this part of the energy stored in the capacitor is reactive power. Therefore, the lighting is to rely on the support of reactive power, in order to outdoor post lights that the circuit is correct use of active power to achieve normal use. Therefore we can say that the lamps not only need active power, reactive power, both are indispensable.

LED lighting low voltage drive technology

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LED light source technology matures, the rapid growth of per-watt light-emitting lumen led gradually decline to lower prices. 1W led high bay lighting light source for example, the spring of 2008, the price is one-third of the price in the spring of 2006, the spring of 2009, dropped to fourth in 2006.

LED green lighting the mass market and a steady growing demand will be the IC industry, the consumer electronics market, super VCD, DVD, mobile phones, MP3, after tsunami!

LED lamps of high-energy, long life, the environmental benefits of the superior performance of generally recognized.

LED High energy: energy-saving energy is clean and is environmentally friendly. DC drive, ultra-low power consumption (single tube 0.03 W -1 watt) electro-optical power conversion close to 100%, the same lighting effects than traditional energy sources more than 80%.

Long-life LED: LED light source is known as the longevity light. Solid cold light source, epoxy encapsulated, light body and no loose parts, does not exist filament light easy to burn, heat deposition, the light fades and fast drawbac k life of up to 50000-100000 hours longer life than traditional light sources 10 times.

LED environmental benefits: LED is a green light, and the environmental benefits of better. No ultraviolet and infrared spectra, low in calories and no flicker, no radiation, and waste recycling, no pollution, no mercury element, cold light source, is safe to touch, is a typical green lighting.

Lighting is very low VF voltage of the LED light source, generally the VF = 2.75-3.8V, IF 15-1400mA; therefore the output voltage of the LED driver IC VF × N or VF × 1 IF constant current in 15-1400mA.LED lamps use LED light source has low power (IF = 15-20mA) and high power (IF> 200mA)) of two kinds of low-power LEDs are usually used to do LED fluorescent lamp, decorative lights, grille; high-power LED is used to do family lights, spotlights, underwater lights, wall wash lights, street lamps, tunnel lights, car work lights and so on. The power LED light source is a low voltage, high current driven device, the luminous intensity determined by the size of the flow through the LED current, current is too strong will cause attenuation of the LED light, LED luminous intensity of the current is too weak will, therefore, LED The driver needs to provide constant current power supply to ensure that the safety of using high-power LED to achieve the desired luminous intensity. In the field of LED lighting to reflect the characteristics of energy saving and long life, choose a good LED driver IC is essential, there is no good driver IC match not reflect the advantages of LED lighting.

The main parameters of the LED work elements LED VF, IF, the other is the color / color temperature / wavelength / brightness / light-emitting angle / efficiency / power consumption. The LED is a PN junction diode, only exert enough forward voltage to conduct current. VF forward voltage of the LED light to establish a normal working condition, IF the forward current is to promote LED light, LED brightness and the flow of current is proportional to the cases. LED VF nominal voltage: 3.4V ± 0.2V LED the IF work current according to application demands, the file can not be mixed.

High-power illumination LED High Power Lighting LED package from the finished look is a single chip, in fact, is the N pieces of LED die is encapsulated in an organization. Their permutation and combination series-parallel, they are N-series, and then N parallel, and then by two points connected power supply (Figure 1). Pay special attention to the selection of the VF and IF.

LED lighting driving principle of LED lighting drivers need to first high-voltage AC transform into a low-voltage alternating current (AC / AC), then the low-voltage AC power into low voltage direct current (AC / DC) transform by the bridge rectifier and then through high-efficiency DC / DC switching regulator buck and transforms into a constant cu rrent source, a constant output current drive LED light source. The LED light source lighting design requirements for low-power or high-power LED strings and more, and which consists of. The string IF current is designed according to the selected LED light source, IF, the total forward voltage â–³ VF is the sum of the N LED s. LED lamp driving principle shown in Figure 2. LED lamps selection below 36V AC power can be considered non-isolated power supply, such as the use of 220V and 100V AC power should consider the isolated power supply.

LED lighting, low voltage driving MR11, MR16 spotlights, underwater lights, wall wash lights, street lamps, tunnel lights, car work lights such as LED lamps are mostly selected heat better comes with copper-based or aluminum plate 1W, 3W high power LED light source, the use of AC/DC12-36V power, and thus need to use the DC / DC step-down (Buck) + constant current to the LED provide VF and IF.LED of lamps mostly use low-voltage pow er supply, so the circuit design of these lamps, led rope lighting the series number of 1-9 stars, especially the 1-3 stars common. Total â–³ VF series should be less than the power supply Vin. Such as three LED series, â–³ VF = 3.4V × 3 = 10.2V Vin> 12V, to work properly. MR11, MR16 spotlights common 1W × 3 series or 3W × 1; underwater lamp is 1W × 3 series 2-3 and a set of three; common wall washer is 1W × 7-9 series; street lights Common 1W × 9 series 3 and, 4 - 6 a group; common automotive work lights 1W-3-6 series 3 and Of course, LED series and parallel programs are diverse, the serial number and its operating voltage (Vin), where the DC12-36V operating voltage. The current 1W LED light source heat better, so use more.

LED lamps on the low-voltage driver chip

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1) the drive nominal input voltage range should meet DC8-40V, to cover the needs of the application surface, the pressure, such as greater than 45V better; AC 12V or 24V input bridge rectifier output voltage with the grid voltage of the chip fluctuations, especially the output DC voltage will be high when the hig h voltage driver IC can not adapt to such a wide voltage range, often in the grid voltage is increased, the breakdown of the LED light source also burned.

2) driver chip s nominal output current requirements is greater than 1.2-1.5A, as the lighting of the LED light source, 1W power LED light source with a nominal operating current of 350mA, 3W power LED light source with a nominal operating current of 700mA. power requires more current, so the choice of LED lighting driver IC must have enough current output, the design of products necessary to make 70-90% of the driver IC to operate at full negative output of the best work area. Full load output current drive IC for led high bay lighting small spaces, poor heat dissipation, fatigue and early failure.

3) the output current of the driver chips necessary for a long time constant, LED light source to stabilize the light, the brightness do es not blink; with the number of driver chips are used under the same conditions, the size of the output current to be as consistent as possible, which is discrete, so high-volume automated production line to be effective and orderly; certain discrete driver chips will be selected in the factory or put into the production line before the sub-file for the output current, adjust the PCB current setting resistor (Rs) of resistance size, so that constant current driver board of the production of LED lamps of similar LED light source luminance, to maintain the consistency of the final product.

4) driver chip package should be conducive to the rapid cooling of the driver IC chip, such as the die (Die) binds directly to the copper, and a Pin is a direct extension of the package, easy to be soldered directly on the PCB copper foil rapid thermal conductivity (Figure 3). 4X4mm a similar silicon die long by 300-1000mA current, there must be power, is bound to heat the chip i tself, the physical thermal structure is also crucial.

5) driver chip s own resistance to EMI, noise, high voltage capacity is also related to the LED lighting products certified by CE, UL and other successful, so the driver chip itself should be used and the beginning of the design good topology and high-pressure production process.

6) driver chip power requirements of less than 0.5W, the requirements of the switching frequency greater than 120Hz in order to avoid frequency interference and produce visible flicker.

Simple application program PT4115PT4115 with a highly integrated DC / DC-Buck → Constant, Current features, it will be DC voltage directly into a stable constant current output. Simple applications of the PT4115 practical circuit is shown in Figure 4.

PT4115 switching frequency using the shaking frequency technology to effectively reduce the EMI frequency jitter technology (Frequency Jitter) is the high bay lighting from scattered harmonic energy to begin to address EMI issues. Frequency Jitter refers to the operating frequency of the switching power supply is not fixed, but periodically from narrowband into broadband way to reduce EMI, and to reduce electromagnetic interference. Frequency jitter, harmonic narrow and discrete, amplitude in the higher harmonic frequencies, EMI concentrated in the Feng Jian. Frequency jitter, the harmonic amplitude is reduced and becomes smooth, high harmonics of nearly continuous response. Reduce the effect of EMI is very significant.

LED lamps plastic transparent sense of

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If repair old as outside the White Bridge before anything, that landscape lighting is none other than. Test the lights last night, changing out a variety of colors of red, orange PCV violet, and near the Shanghai Mansion, Astor House Hotel as far as the Pearl of the Orient, each other, cr eating a dignified and elegant, or warm and lively, fashionable different atmosphere.

The outside landscape lights on the White Bridge is a full-color led ceiling lights lamps, and lamps within the three colors of red, green, blue chip, through the control center computer to adjust the three colors in different proportions to produce different colors. The landscape lighting designer - director of the Shanghai City Lights Lighting Design Co., Ltd. Lighting designers should Jinsong, said in the new landscape lighting, the lamps of the seven kinds of specifications add up to nearly 2000, originally only 490, but it can consumption is reduced by more than 30%.

Peacetime and the festival landscape

It is reported that the new landscape lighting is divided into the usual and festivals in two modes, the usual mode of the main colors for the warm yellow. Holidays or important events, la ndscape lighting will be turned into a variety of colors, to create an atmosphere to cope with echoes and Pudong Lujiazui colorful night lights. "We chose different landscape lighting single tone with the past, mainly on account of the particularity of the outside of the White Bridge. Outside the White Bridge can be said of classical and modern forms a knot, which also determines the special needs of its light color."

Because the power has not yet fully in place last night, the test light is only part of the whole bridge, landscape lighting, while the last batch of lamps are also stepping up to install. It is understood that with the opening of approaching the scope of the test light will gradually expand. Open in early April that outdoor light fixtures, colorful lights in the future add to the fun.
 

awareness of environmental protection LED light sources into lighting the mainstream of development

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Committed to the protection of consumer safety, UL (UnderwritersLaboratories) safety standards for the LED module and lighting - ULSubject8750 draft drawn up in 2005 to regulate the LED as light source products provide a set of R & D for the p roduction of LED lamps lighting verification specification guidelines can be followed. , UL and ITRI close cooperation with ITRI s AC LED prototype, to ULSubject8750 draft safety assessment validation, and give the institute recommended for heat and brightness, and other vital personal safety-oriented and look forward to to assist the design of a prototype as soon as possible standardized.

ULSubject8750 draft is expected to be released in early 2009 as a formal standard, and expects to become the LED product standardization in mind, is the industry s sales of LED products to North America, an essential safety certification specifications; UL LED security authentication service applies to the LED primary light source all kinds of products, including lamps, bulbs, drive, LED light source lighting products in addition to both security specification must also verify that for the special properties of the led rope lighting light source module.

 

for the elaboration of two major development direction, indoor LED lighting design

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Modern lamps from the lighting effects, not only in the living room is also an important component to create the atmosphere of the indoor environment. The room led rope lighting can not be separated from the lamps, lamps lighting will Crafts reaction, it is both a tool to stop the transfer room install effect, set up the visual conditions, and is part of the decor of the room, lighting skills and install art concession body. Coordination of lighting design and light color, make the indoor environment Shiquan certain atmosphere and mood, reflecting the style and characteristics has always been, an increase in the erection of the beauty of the art indoor space more responsive to people s psychological and physical in nature, needs and aesthetic fun. garden led lights is a green light. led lights DC drive, not strobe; infrared and ultraviolet components, there is no radiation thick cloud of high color and strong Shiquan LED bias; dimming performance ...