Industrial lighting

Greenhouse planting LED lights

LED energy-saving lamp has the advantages of high light efficiency, low power consumption, long life, easy to control, etc., compared with traditional high pressure sodium lamp in the greenhouse, can save more than 60% of the electricity, and no longer need to arrange a special person to turn on and off the light mechanically.Greenhouse, greenhouse and other facilities can significantly improve the temperature of the growing environment of crops, but due to the refraction and blocking of the sunlight by glass, sunshine board, film and other coverings, the light inside the facility will decrease.Therefore, in order to obtain high quality and high yield, supplementary light is an important technical measure. LED light of different wavelengths is used for light distribution, and the sunshine at different periods of the day is simulated by the automatic regulation system, and the light source is used to prevent diseases and insect pests, which can ensure the healthy growth and safety level of crops and significantly improve the yield and quality of crops.

At present, the new light sources used for artificial lighting include sodium lamp, neon lamp and helium lamp.High - pressure sodium lamp is the source with high luminous efficiency and effective photosynthetic efficiency.

The spectral energy distribution of high pressure sodium lamp is 39% - 40% red and orange light, 51% - 52% green and yellow light, and 9% blue and purple light.Because it contains a lot of red and orange light, it has a high efficiency of light supplement, which is suitable for green house plants.

Neon and helium lamps are both gas discharge lamps.Neon lamp mainly radiates red and orange light, and its spectral energy distribution is mainly concentrated in the wavelength range of 600-700 nm, which has the most photobiological spectral activity.Helium main radiation light red, orange and purple light light, each accounts for about 50% of the total radiation, leaf pigments can absorb in the radiation energy accounted for 90% of the total radiation energy, of which 80% is absorbed by chlorophyll, it is highly advantageous for the normal physiological processes of plant, in order to improve the service life of the light source, light source will need to be very good deal with heat, Lori has provided a lot of cooling solutions to customers in this field, including our 1 m and 2 m extruded aluminum heat sink and high power heat sink heat pipe welding.

This kind of light source is specially designed and developed for plant illumination.The distribution and proportion of the physiological radiation energy of the plant growth lamp are reasonable, and the effective physiological radiation energy of the red and orange light accounts for 58%, the effective physiological radiation energy of the blue and purple light accounts for 32%, and the effective physiological radiation energy ratio is as high as 90%.

Outdoor LED lights

At present, one of the biggest technical problems of LED lighting is heat dissipation. Poor heat dissipation leads to LED driving power supply and electrolytic capacitor becoming the shortcoming of further development of LED lighting and the cause of premature aging of LED light source.

Only when the heat is exported as soon as possible, can the cavity temperature inside the LED lamp be effectively reduced, can the power supply be protected from working in a high-temperature environment, and can the premature aging of the LED light source be avoided due to long-term high-temperature work.

It is because the LED light source has no infrared ray and ultraviolet ray, so the LED light source has no radiation and heat dissipation function. The heat dissipation way of LED lighting can only be derived through the heat sink closely combined with the LED bead plate.heat sink must have the function of heat conduction, heat convection and heat radiation.

Any heat sink, besides want to be able to be conducted quickly heat quantity from calorific source the surface of heat sink, the main still should rely on convection and radiation to send out heat quantity to go in air.Heat conduction only solves the way of heat transfer, and heat convection is the main function of heat sink, heat dissipation performance is mainly determined by the ability of heat dissipation area, shape, natural convection intensity, and heat radiation is only an auxiliary role.Generally speaking, if the distance of heat from the heat source to the heat sink surface is less than 5mm, the heat can be derived as long as the thermal conductivity of the material is greater than 5, and the rest of the heat dissipation must be dominated by thermal convection.

The following is a comparative analysis of four types of heat sinks.

1. Die-cast aluminum heat sink

The production cost is controllable, and the cooling fin cannot be made thin, so it is difficult to maximize the cooling area.The common die casting materials for the heat sink of LED lamps are ADC10 and ADC12.

2. Extruded aluminum heat sink

Is the liquid aluminum through the fixed mold extrusion molding, and then the bar through machining cutting into the shape of the heat sink, the late processing cost is high.Heat dissipation of the teeth can do a lot of very thin, heat dissipation area to get the largest expansion, heat dissipation of the teeth automatically formed when the air convection heat diffusion, heat dissipation effect is better.The commonly used materials are AL6061 and AL6063.

3. Stamping aluminum heat sink

Is through the punch and die of steel, aluminum alloy plate stamping, pull up, so that it becomes a cup type heat sink, stamping shaped heat sink inside and outside the periphery of smooth, because of finsless and heat dissipation area is limited.The commonly used aluminum alloy materials are 5052, 6061 and 6063.The quality of stamping parts is very small and the material utilization rate is high.

4. Skived fins aluminum heat sink

The heat dissipation plate is a whole section without any connecting points, which can give full play to the heat dissipation characteristics of the section.

Lori technology professional do Skived fins heat sink, Skived fins process can make the blade blade thinner/higher density, high heat dissipation efficiency.The processing technology is simpler than other water-cooled liquid-cooled heat sinks, the weight is lighter and the cost is lower.

Compared with the aluminum extrusion process, there are no size restrictions, can be made more wide, free from the expensive mold cost, can be used for heat dissipation on high-power equipment.

LED are solid - state semiconductor devices that convert electrical energy into visible light.The heart of an LED is a semiconductor chip, which is known to generate a lot of heat when working.The greater the power of the lamp, the greater the heat.For example, CPU and GPU are the same, so heat dissipation protection is particularly important.In the case of poor heat dissipation, the life of LED will be greatly reduced, Lori technology professional customization of high-power heat dissipation, to provide the best thermal solution.

For large outdoor LED lights, heat dissipation is particularly important.Passive heat dissipation or air cooling heat dissipation has been increasingly unable to meet the heat dissipation needs.This requires the introduction of new cooling technology, and water cooling cooling is a good choice.No matter from heat dissipation technology, or from more aspects, water cooling heat dissipation will be a mainstream trend in the future.The advantage of water cooling is that the heat dissipation efficiency can quickly remove the heat and effectively reduce the core temperature.The relatively closed space allows the LED to be free from dust.Extend the service life of lamps and lanterns thereby, also increased the brightness of illume.Excellent stability, reduced maintenance costs.In a word, water cooling heat dissipation is a good solution to the problem of LED heat dissipation.For scenes with more outdoor applications, football fields, basketball courts and stadiums play an important role.

Auto LED light

The core of the principle of automobile LED is a chip composed of n-type semiconductor and p-type semiconductor.Between n-type and p-type semiconductors, there is a transition layer of p-n junction. When the majority of injected carriers and minority carriers are combined, the excess energy will be released in the form of light in some semiconductor materials, and then the electrical energy will be converted into light energy.If the voltage is applied in the opposite direction, it will be difficult to inject minority carriers and therefore will not emit light.

Here is how to solve the problem of heat dissipation by led high-power heat sink.

LED by V elements in the periodic table and Ⅲ elements, the family is composed of compound semiconductor materials, such as: gallium phosphide and gallium arsenide are monochrome LED commonly used materials.At present, gallium nitride is the main material for making white LED.As for GaN thin film materials, there is no monocrystalline GaN that can be homogenized and epitaxial at present. It mainly relies on the organic metal meteorological precipitation method to generate monocrystalline GaN on the relevant heteromorphic support substrate.N-a1gan, p-a1gan, n-gan and other materials are successively plated on the bottom, and then a series of technological processes, such as packaging and slicing, are used to complete the manufacturing.However, sapphire is the main substrate material of gan-based LED, so the substrate material that can replace it has not been found yet.

The power of the traditional core is relatively small, and there is not much heat dissipation, so there is no serious problem in heat dissipation, but the high-power LED is different, and its chip power density is very large.At present, due to the semiconductor manufacturing technology, more than 80% of the input power is converted into heat energy, and less than 20% into light energy.If the heat of the chip is simply to enlarge the package size in proportion, it cannot be sent out, and it is very likely to lead to solder melting, resulting in chip failure, and accelerate the fluorescent powder and chip aging is inevitable, LED color will also become worse when the temperature rises.Heat dissipation is of great significance for the LED, generally require junction temperature below 110 ° C, in order to guarantee the life of the device.

At present, the main problem to be considered in high-power Auto LED lights packaging is how to improve the heat dissipation caused by increasing chip power.At present, there are two methods commonly used to improve LED heat dissipation, which are as follows: 1. Accelerate internal heat dissipation, improve LED heat dissipation structure, and effectively reduce chip temperature; 2.The latest LED heat control technology is the use of integrated heat sink for heat dissipation, water cooling, cooked pipe technology, air cooling, micro pipe heat dissipation, is currently more commonly used heat dissipation technology.

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