LED Lights Application Archives - Outdoor Lighting

LED Lighting Maintenance

Awen Li — Thu, 30 Jun 2016 14:07:23 +0000

LED Lighting Maintenance

Traditional factory, warehouse and office lighting maintenance is often painful and can incur high energy costs. What we get to see on a regular basis are failing ballasts, blown tubes and bulbs and reduced light output. Did you know that with fluorescents, if a tube is removed or blown, the fixture’s ballast still draws the same energy as if the light was 100% operational?

Traditional lights can be expensive to maintain and can consume large amounts of energy making up a significant chunk of a business’s hydro bill. By today’s LED standards, traditional lighting delivers very poor light levels and light quality. Unlike residential customers who only have lights on for a few hours per day, most industrial facilities have the lights on most of the time. While residential lighting uses 40-100 Watts per traditional incandescent bulb, traditional industrial lighting uses much more energy per larger fixtures.

Lamp lumen depreciation is another phenomenon that affects all the traditional lighting. Quality LED lighting is now typically rated at 50,000+ hours with by comparison minor degradation of light quality. Aging traditional lamps will steadily produce less light, while burning up the same energy as when they were new. The long-life performance of the Pristine LED fixtures means that clients can now expect to get as much as 10 years of life out of each fixture – the first five covered by our 5 year replacement warranty.

When maintenance and electricity are combined, industrial facilities are looking at traditional lighting costs that approach $1 per square foot per year. For these clients, the benefits of LEDs (lower wattage, long life and suitability to energy-saving controls) make them extremely compelling – especially with a payback period of one to two years. Intelligent LEDs – with integrated sensors, controls and optics as developed by Pristine LED can drive this cost down to audit savings of 90% or less than ¢.04 per square foot per year.

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4 Key Points in Design LED Outdoor Lighting

Awen Li — Thu, 30 Jun 2016 08:33:03 +0000

4 Key Points in Design LED Outdoor Lighting

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LED Outdoor lighting design should comply with the latest outdoor lighting technical specifications, as well as the city lighting design standard.Movie Carol (2015)

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1, Working Environment

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The working environment of outdoor lighting is tough, like wind, rain, sunshine, the ultraviolet radiation, the temperature changes, dust, chemical gas influence, and year by year aging treatment by nature. We should fully consider the impact of these factors before design.

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2, Structure Design

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Heat sink is generally chose aluminum or aluminum alloy, copper or copper alloys, and other alloy with good heat conduction. The cooling way like cooling air convection heat, wind cooling heat and heat pipe cooling, (jet cooling heat dissipation is similar to a heat pipe cooling, but more complicated structure) Choose what kind of cooling mode has a direct impact on the cost of the light, should be more considered.

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Now we use transparent organic glass, PC material, etc., traditional chimney is transparent glass products. The best choice for chimney of outdoor lighting is traditional glass products, it is the best choice making the long life and high-grade lighting. The transparent plastic, organic glass, etc materials do chimney, it’s better to do the chimney of indoor lighting. If used it for outdoor, the life is limited. Due to the outdoor sunlight, ultraviolet ray, sand and dust, chemical gases, day and night temperature change and other factors. At the same time the pollution is not easy to settle accounts clean, make lampshade transparency reduced light output.

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3, LED Chip Package

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Current LED outdoor lighting (mainly street lamp) are mostly use 1 w LED more series and parallel for assembly, this kind of method thermal resistance advanced packaging technology products is high, not easy to create high quality lighting. And another way is to use 30 w, 50w even greater module for assembly, in order to achieve the required power, these LED encapsulation materials useful epoxy resin encapsulation, useful silica gel encapsulated. The difference is: epoxy resin encapsulation heat resistance is poorer, time is long aging. Silica gel encapsulation is heat resistance is good.

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More chips and radiator whole package is better, or use the aluminum plate more chip package again through the phase change material or heat silicone grease and radiator connected, make product thermal resistance than using LED device assembly product thermal resistance is less one or two word thermal resistance, and will be more suitable for heat dissipation. The LED module lighting, module base plate is commonly copper base plate, it to the radiator of the connection to use good phase change material, or good heat dissipation silicone grease, guarantee the copper base plate of heat can promptly to the radiator up, such as processing is not easy to make heat accumulation cause module chip is too hot, influence the normal work of the LED chip. The author thinks that: chip packages suitable for manufacturing general lighting lighting, module encapsulation limited space for the occasion of manufacturing compact led lighting (such as car main lighting head lamp, etc.).

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4, Design of Radiator

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The radiator is one of the crucial parts of LED lighting, its shape, volume, heat dissipation surface area are designed to address the benefits. If radiator is too small, LED lighting working temperature is too high, influence the luminous efficiency and life. If radiator is too large, the consumable material increase product cost and weight, make the product competition force down. Design the suitable LED lighting radiator design has the following 7 parts:

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1. Understand the need of power for LED lighting cooling.

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2. Some parameters when designing radiator: metal heat, the thermal conductivity of metal, chip thermal resistance, thermal resistance, the surrounding environment air thermal resistance, etc.

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3. Determine the type of the heat dissipation, (natural convection, wind cooling, heat pipe cooling, and other cooling mode. From the cost comparison: natural convection cost minimum, wind cooling medium, heat pipe cooling cost is higher, jet refrigeration highest cost.

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4. Define LED lighting licensing the highest working temperature (environment temperature and lighting licensing temperature rise)

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5. Calculating the volume of radiator, radiator area. And make sure the shape of the radiator.

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6. The radiator and LED lighting sets synthetic complete lighting, and energizing work more than eight hours at room temperature, 39 ℃ – and ℃ environment check the temperature of the lighting, look to whether meet the cooling requirement, in order to check calculation is correct, such as do not satisfy the conditions of use, should recount and adjusting parameters.

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7. The radiator and lamp shade seal to do waterproof, dustproof, chimney and the radiator to pad anti-aging rubber pad or silicone rubber pad, with stainless steel bolts and do seal waterproof, dustproof.

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12 problems in High Power LED Lighting Application

Awen Li — Tue, 28 Jun 2016 08:13:19 +0000

12 problems in High Power LED Lighting Application

Human’s lighting history has experienced three times: incandescent lamp, fluorescent lamp, high intensity gas discharge lamp. LED as the fourth generation light source has follows excellent characteristic: high luminous efficiency, less power consumption, long service life, safety reliability etc. In recent years, LED lighting became popular gradually, but there are still existing some problems in high power LED in lighting application.

1, LED Color Difference Problem

Single LED application, basically there is no color difference problem. But when put many LEDs into to a lamp or with multiple LEDs at the same time, the color difference problem will be out. Although there are machines divide LEDs into 8 divisions by color temperature, with a batch of LEDs in a same color temperature still exists differenceS, and this difference is still can’t escape the naked eye.

2, LED Insulation Problem

A single LED is not insulated, impact can be ignored. But when lots of LEDs in series, insulation will be a problem.

3, LED Pulse resistance problem

This problem is still controversial. But, do exist in practical application. It mainly happened on a cold pulse. The moment of power on, a few LEDs will be breakdown or disconnected.

4, LED Beam Angle Problem

Due to various LED lens, and even the same beam angle, effect is also different. It makes it harder to select snoot.

5, LED Hidden Danger of Blinded Problem

LED light is dot light, its concentration light souce makes center super brightness, so it is easy to hurt people’s eyes.

6, LED Heat Dissipation Problem

In theory, the LED is low hot, but as a result of current technology, LED heat’s problem is still need to be solved.

7, LED Efficiency Problem

At present, LED electric conversion efficiency is low.

8, LED Brightness Problem

For some application, like store spot light. It’s brightness is not enought to replace the traditional light.

9, LED Lumens depreciation and Life Problem

At present, LED light failure problem is still serious. Additional cooling solution is good or bad, driver matching or not is likely to affect LED light failure and life. So, 10,0000 hours are just a selling point.

10, LED Driver Problem

LED is driven by DC. Using constant current control, makes the drive circuit quite big, and efficiency low. At the same time, the driver life span is too much short than LED’s.

11, LED Modelling Limit

Due to the nature of single side lighting, LED lamp is limited by a certain shape.

12, LED Price Problem

It is still high price for quality products.

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What is Color Tempreture

Awen Li — Tue, 28 Jun 2016 07:59:28 +0000

What is Color Tempreture

Color temperature is a characteristic of visible light that has important applications in lighting and other fields. Color temperature is conventionally stated in the unit of absolute temperature, the kelvin, having the unit symbol K.

Absolute temperature (K) was presented in 1848 by the British physicist Keivin. He considers starting point temperature is 273.16 ℃ below zero centigrade. Absolute temperature calculation, therefore, is 273.15 ℃, combined with the Celsius temperature usually used, such as body temperature is 36 ℃, and absolute temperature 309 k.

The color temperature of a light source is the temperature of an ideal black body radiator that radiates light of comparable hue to that of the light source. Is a standard blackbody, heating temperature to a certain extent the color started from deep red to pale red – orange – white – blue and white – blue change gradually. Using this light color changing characteristic, the light from light source color hue to the light of the blackbody at the same time, we will absolute temperature blackbody was known as the color temperature of the light source. It does not make sense to speak of the color temperature of e.g. a red or a green.

Color Tempreture

Color temperature affects the atmosphere of the space. Color temperatures over 5,000K are called cool colors (blueish white), while lower color temperatures (2,700-3,000 K) are called warm colors (yellowish white through red). Under 3300K color temperature, light color has partial red phenomenon, is a kind of warm feeling to the person, above 5000k color temperature, color slants white, give a person a kind of cool feeling.

In addition, the different color temperature of light environment and medium temperature also affects the people of the surrounding environment’s color feeling. Take red light for example, under the red light source, people often cannot see the red color perfectly.

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9 Points to Choose LED Light Source

Awen Li — Tue, 28 Jun 2016 06:28:46 +0000

There is very different price in the market for LED light source. As the buyer, how to choose the best cost performance LED light source? Following 9 points for assistance you making a smart choice.

1, Higher brightness, higher price. Used for LED lamp, the LED should comply with the laser level Ⅰ class standard.

2, With strong antistatic ability, LED is long life. So the price is high. Antistatic usually greater than 700 v, LED can be used for LED lighting.

3, Consistent wavelength, means consistent color. Request the same color temperature, the price is high. Even with LED spectral color separation apparatus, manufacturers are also difficult to produce highly consistent color LED.

4, Leakage current.
LED is a one-way conductive lights, if there is reverse current, it is called leakage. If leakage current big, LED service life will be short. And price certainly low.

5, Different beam angle, different price. Special light beam angle, the price is higher. Such as diffuse angle.

6, Life span,
Life is determined by light failure. Light failure small, means long life. Long life LED, high price will be high.

7, The lighting part of LED light source is the LED chip. Different chip, the price difference is big. Japan, USA’s LED chip generally is more expensive. Chips in Taiwan and Chian, price is lower than Japan and United States.

8, Chip, expressed as length. The bigger size, quality is better. The chip size is proportional to the price.

9, Package colloid
Ordinary LED colloid is epoxy resin. With UV resistance and fireproofing agent, LED prices more expensive. High quality outdoor LED lighting should be resistant to ultraviolet light and fire.

From health into consideration, it is suggested that using non-toxic materials design. You can directly use the nose to define the quality. Good product is without bad smell. From safety considerations, the product should be dust proof, moisture proof, fire prevention, no UV, preventing low temperature cracking, relative to this LED product price is high.

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