CN102510639A - Led lighting device - Google Patents

Led lighting device Download PDF

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CN102510639A
CN102510639A CN2011104176339A CN201110417633A CN102510639A CN 102510639 A CN102510639 A CN 102510639A CN 2011104176339 A CN2011104176339 A CN 2011104176339A CN 201110417633 A CN201110417633 A CN 201110417633A CN 102510639 A CN102510639 A CN 102510639A
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emitting diode
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pcb
circuit board
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CN102510639B (en
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东日出市
藤井学
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Abstract

The invention discloses an LED lighting device. The lighting device includes a transparent box, a PCB arranged in the transparent box, and a plurality of LEDs arranged on the PCB in a laying manner. The LEDs are connected through circuits. The driving current adopted by the LEDs is in a range of 55% to 85% of a rated current of the LEDs. The installation density of the LEDs on the PCB is 1.0 to 1.5 per cm2. In the invention, the driving current of the LEDs is reduced. By increasing the number of the LEDs assembled on the lighting device, the integral luminance of the lighting device is kept. The heating volume generated on the lighting device is reduced. And the service lifetime of the LEDs used on the lighting device is prolonged. Besides, the economical efficiency of the LED lighting device used in indoor cultivation facility is also improved.

Description

Light emitting diode illuminating apparatus
Technical field
The present invention relates to the lighting device that a kind of light-emitting diode is laid on printed circuit board (PCB), be specifically related to a kind of at the indoor light emitting diode illuminating apparatus that is used for the cultivation of plant etc.
Background technology
At present; The development rapidly along with semiconductor technology in several years; The characteristic of light-emitting diode is especially progressive with its efficient; Be accompanied by manufacturing technology obvious improvement and production-scale increase, the low price of light-emitting diode is development hastily also, makes the lighting device of the light-emitting diode incandescent lamp before having substituted little by little universal widely socially with fluorescent lamp.
Further, use the lighting device of light-emitting diode, except that the illumination of common family and office etc., also in various fields, having obtained using widely.Particularly light-emitting diode is used for the artificial light that what is called is called as " plant factor ", causes extensively in the utilization of the cultivating facilities of indoor planting plants in great and vegetables and watch attentively.This is, the distinctive emission wavelength characteristic of light-emitting diode, and low consumption electric power property, and it also is optimal can be described as only with regard to the utilization of cultivating facilities such as houseplant.
In general, there is the shape of displaying in the light emitting diode illuminating apparatus room that in indoor cultivating facility, uses in Japanese documentation 1 (spy opens the 2002-141555 communique) lining.In other words, light-emitting diode is made most light-emitting diodes of laying, is packed this substrate in the cylinder flask of well-illuminated resin and glass into, forms product of the present invention by light emitting diode illuminating apparatus on vertical printed circuit board (PCB).
, the energy transformation efficient in light-emitting diode from electric power to the light has also only improved about 4~10% degree than incandescent lamp in the past.Therefore, using on the light emitting diode illuminating apparatus, if increase its illuminance, bring the caloric value of lighting device self also can increase thus.Yet; The semi-conducting material of GaAs that general light-emitting diodes is effective and gallium nitride etc. runs into heat energy and can become fragile; 80 degree Celsius when above electric elements can begin to wear out, continue to increase the heat of high temperature burden on the element, can shorten terrifically as life-span of light-emitting diode.
So; Should solve the relevant problem of light emitting diode illuminating apparatus of using effectively, such as, radiating effect on the metal radiator of design on the lighting device promotes by device; Perhaps; On the current driving circuit of light-emitting diode, go up the same design current restricting circuits of demonstration by patent documentation 2 (spy opens the 2004-214519 communique) and patent documentation 3 (spy opens the 2010-103217 communique), explain the measure of plan caloric value attenuating according to the mobile electric current of control light-emitting diode.
But the method for on lighting device, adding radiator can cause the rising with installation cost that increases considerably of installation weight.Also have appending as the current limit circuit that is shown on the above-mentioned existing patent documentation; It is complicated that the control circuit of lighting device becomes; Follow the rising of its installation cost, and can cause the defective that the increase of failure factor causes according to the increase of using electronic unit.Particularly, in the above-mentioned lighting device that is used for the indoor growing facility, about 1 lighting device owing to use extremely most light-emitting diodes, be counted as fatal defective popularizing of lighting device as similar defective.
Summary of the invention
The invention provides a kind of light emitting diode illuminating apparatus; Solve problem that above-mentioned prior art exists and defective as purpose; More specifically, provide a kind of use on the indoor growing facility of vegetables and plant etc., caloric value few and device lifetime of long light emitting diode illuminating apparatus is provided.
For realizing above-mentioned purpose; The invention provides a kind of light emitting diode illuminating apparatus; Be characterized in; This lighting device comprises transparent boxes, is arranged on the printed circuit board (PCB) in the transparent boxes, and is laid on the some light-emitting diodes on the printed circuit board (PCB), and each light-emitting diode circuit each other connects;
The above-mentioned drive current that light-emitting diode adopted be set in this light-emitting diode rated current 55% to 85% between;
Above-mentioned light-emitting diode is laid on packing density on the printed circuit board (PCB) and is set in 1 square centimeter 1.0 to 1.5.
Concern between the packing density increment rate β of light-emitting diode drive current reduced rate α and light-emitting diode in this lighting device and be:
β=(1/α)×k
Wherein, k is a coefficient of luminous intensity, and its span is between 0.8 to 1.0;
The numerical value that the numerical value of 1/ α multiply by 0.8 to 1.0 coefficient of luminous intensity k gained can confirm to lay on the said printed circuit board (PCB) packing density increment rate β of light-emitting diode;
Be increased in the laying quantity of the light-emitting diode on the printed circuit board (PCB) according to this packing density increment rate β, can keep before and after the light-emitting diode drive current reduces in this lighting device the illuminance of light-emitting diode consistent on the whole.
This lighting device is used for indoor growing, is provided with 10 centimetres distance between this lighting device and the cultivated plant.
Above-mentioned transparent boxes adopt transparent resin to process, and its surface is made as the structure that can make the radiating light scattering.
Above-mentioned printed circuit board (PCB) adopts printing board PCB, and its surface or the inside are provided with copper foil circuit.
Above-mentioned light-emitting diode adopts the light-emitting diode of the plastic molded type of bullet type.
Light emitting diode illuminating apparatus of the present invention is compared with prior art; Its advantage is; The present invention can be lowered the drive current of light-emitting diode gradually; And, can keep the whole illuminance of lighting device according to concerning between the packing density increment rate β of light-emitting diode drive current reduced rate α and light-emitting diode that increase is assembled in the quantity of the light-emitting diode on the lighting device, realize reducing by the caloric value that produces on the lighting device; Can prolong the life-span of the light-emitting diode that on lighting device, uses, also can improve the economy of the light emitting diode illuminating apparatus that in the indoor growing facility, uses.
Description of drawings
Fig. 1 a is the structural plan figure of light emitting diode illuminating apparatus of the present invention;
Fig. 1 b is the structure front elevation of light emitting diode illuminating apparatus of the present invention;
Fig. 1 c is the sectional view of A-A ' line among Fig. 1 a and Fig. 1 b;
Fig. 2 connects sketch map for the circuit of light emitting diode illuminating apparatus of the present invention;
Fig. 3 is the graph of a relation of light-emitting diode drive current and caloric value.
Embodiment
Below in conjunction with the best embodiment of description of drawings the present invention.
As Fig. 1 a and combine Fig. 1 b and Fig. 1 c shown in, Fig. 1 a is the structural plan figure of light emitting diode illuminating apparatus 10 of the present invention.Fig. 1 b is the structure front elevation of light emitting diode illuminating apparatus 10 of the present invention.Fig. 1 c is the simple formula section figure line (sectional view) of A-A ' line among Fig. 1 a and Fig. 1 b.
Moreover; Various wiring materials and electronic unit on the light emitting diode illuminating apparatus 10, or various circuit etc., direct relation do not had with main contents of the present invention; So omitted its sign among 1a, Fig. 1 b and Fig. 1 c among the figure, in specification, also omitted its relevant record equally.
Light emitting diode illuminating apparatus 10 of the present invention mainly is made up of printed circuit board (PCB) 11, light-emitting diode 12 and transparent boxes 13.Printed circuit board (PCB) 11 is widely used printing board PCBs on the general circuit, and the material of this printed circuit board (PCB) 11 can adopt the for example printed circuit board (PCB) material commonly used of paper epoxy resin, glass epoxy resin or Berlet phenolic resins etc.
Be connected more light-emitting diode 12 in order on same printed circuit board (PCB) 11, to install with circuit, the printed pattern (copper foil circuit) that the technology of utilizing photoetch etc. among the present invention is provided with Copper Foil in surface or the inside (the last demonstration of figure) of printed circuit board (PCB) 11.The connection that is installed between each light-emitting diode 12 on the printed circuit board (PCB) 11 can constitute various connecting circuits, takes one of them example here, and for example: in the prior art, connecting circuit as shown in Figure 2 is widely used.
As shown in Figure 2, form in the connecting circuit of a printed circuit board 11 and include 30~40 series arms that are connected in parallel.Include about 12~15 light-emitting diode of quantity 12 in each series arm, these several light-emitting diodes 12 are connected in series, and also are connected in series with an electric current limiting resistance 14 in each series arm simultaneously.According to the characteristic of selecting suitable power circuit 15 and circuit mode etc., can omit electric current restriction impedance 14 in the circuit.
As shown in Figure 2, in the series arm in the connecting circuit, light-emitting diode 12 is owing to all be connected in series, and value of current flowing all must be same current value in each light-emitting diode 12.Also have, each series arm in the connecting circuit is in order all to realize being connected in parallel, and the magnitude of voltage of using on each series arm must all be same magnitude of voltage.Moreover connecting circuit as shown in Figure 2 is one embodiment of the present of invention, and connecting circuit of the present invention is not only limited to connected mode involved among this embodiment.
What the form of light-emitting diode 12 and kind adopted in the present embodiment is the light-emitting diode by bullet type formed resin closed type.Simultaneously, about the illuminant colour of light-emitting diode 12, according to the cultivation object plant and the attribute of vegetables that are placed in the indoor growing facility, perhaps condition such as corresponding cultural method can be selected corresponding illuminant colour from various semi-conducting materials.
For example, if stress the illuminant colour of red colour system, use the light-emitting diode 12 that forms in the semi-conducting material of aluminum gallium arsenide and gallium phosphide arsenide system better.If stress illuminant colour blue or green, green system, it is optimal using the light-emitting diode 12 that forms in the semi-conducting material of zinc selenide and silicon carbide system.Also have, in conjunction with respective leds 12 purposes and purpose etc., the light-emitting diode 12 of the multiple different illuminant colour of compound employing is best.
Moreover; The present invention is for the hot burden that alleviates light-emitting diode 12 and prolong its useful life; Than adopting the little high brightness type of thermal capacity, the light-emitting diode of patch-type, it is optimal adopting the light-emitting diode of the plastic molded type of the big bullet type of thermal capacity.
With regard to present market, be the developing direction of main flow because the development of light-emitting diode 12 is tendencies with the light-emitting diode of the patch-type of high brightness type, the plastic molded type of bullet type has become old-fashioned with regard to market, and its price is also progressively reducing.Therefore, use the light-emitting diode of the plastic molded type of bullet type, also can expect the optimum efficiency of controlled reduction lighting device integral product cost.
Transparent boxes 13 are housing parts of light emitting diode illuminating apparatus 10, and it is used to place the printed circuit board (PCB) 11 that a large amount of light-emitting diode 12 is installed.The material of transparent boxes 13, such as, various transparent resin materials such as macromolecule resins such as propylene, Merlon or plastics and glass can be adopted.Also have, also with regard to its shape, be not limited to the cylinder type example shown in Fig. 1, corresponding different actual operating positions, transparent boxes 13 can be made various shapes.
The principle condition of transparent boxes 13 is outsides that the light of the light-emitting diode 12 placed in its inside must emit to box, so that transparent boxes 13 are made as is transparent.But in order to let the radiating light scattering of light-emitting diode 12, the preferred plan of transparent boxes 13 can be: the surface of transparent boxes 13 can be made translucent, perhaps also can be provided with the face of being uneven and the not structure of joint face such as concavo-convex in its surface.
As shown in Figure 2, the inside that power circuit 15 is arranged on transparent boxes 13 also is preferred plan, and perhaps power circuit 15 also can be arranged on the outside of transparent boxes 13.In addition, if want to alleviate the hot burden of the light-emitting diode 12 that is installed on the printed circuit board (PCB) 11 in the technical scheme, then its preferred plan can be the outside that power circuit 15 and various electronic control circuit with heating are arranged on transparent boxes 13.
Below, explain about its dynamic situation according to the function of light emitting diode illuminating apparatus 10 of the present invention.As shown in table 1, shown that light emitting diode illuminating apparatus 10 obtains various test datas in three experiment examples (example 1, example 2 and example 3).
In this example 1, example 2 and the example 3, the installation form of light-emitting diode 12 is: 12 light-emitting diode 12 is connected in series and forms a series arm.Be to compose in parallel connecting circuit under the situation of example 1, and be set on the printed circuit board (PCB) 11 by 30 row series arms.Be that 36 row series arms compose in parallel connecting circuit under the situation of example 2, and be set on the printed circuit board (PCB) 11.Be that 43 row series arms compose in parallel connecting circuit under the situation of example 3, and be set on the printed circuit board (PCB) 11.Therefore, with regard to each example, in example 1, example 1 and the example 3,360,432 and 516 s' light-emitting diode 12 has been installed respectively on the printed circuit board (PCB) 11 separately.
Be used for the printed circuit board (PCB) 11 in these three example tests, adopt the long chi rectangle of making length 102.6cm, width 4.4cm, its part that light-emitting diode 12 is installed is made the size of 99.1cm * 3.6cm.So the real area of the mounting portion of this light-emitting diode 12 is 357.6cm 2Packing density about light-emitting diode 12 in each example is as follows:
1 1.007/cm of example 2
2 1.208/cm of example 2
3 1.443/cm of example 2
Among the present invention, the packing density of the light-emitting diode of laying on the printed circuit board (PCB) 11 12 is set in 1 square centimeter 1.0 to 1.5, and wherein better is to set about 1.2 in 1 square centimeter.
In these three example tests, the power supply of light emitting diode illuminating apparatus 10 adopts the constant-current supply of direct current.The power supply of supplying with printed circuit board (PCB) 11 all is set at same 500mA.So should three in the example, the average current that flows in each row series arm, i.e. average current that light-emitting diode flows, clearly the record value is as follows for it:
Example 1 500mA ÷ 30 row ≈ 16.7mA
Example 2 500mA ÷ 36 row ≈ 13.9mA
Example 3 500mA ÷ 43 row ≈ 11.6mA
The rated current of the light-emitting diode 12 that in the test of these three examples, uses is greatly about 20mA.The relation of the rated current of light-emitting diode 12 is following separately so the average currents that flow in the light-emitting diode 12 in each above-mentioned example are for it: the drive current that flows to its each light-emitting diode 12 in the example 1 is about 84% of its rated current; The drive current that flows to its each light-emitting diode 12 in the example 2 is about 70% of its rated current; The drive current that flows to its light-emitting diode 12 in the example 3 is about its rated current 58%.
Among the present invention, the drive current of each light-emitting diode 12 can be set at its rated current 55% to 85% between.The drive current of wherein better is light-emitting diode 12 is set at about 70% of its rated current.
Table 1: the test data of three kinds of test examples of light emitting diode illuminating apparatus
Figure BSA00000636015300061
Current control method is a prior art; Can adopt for example the resistance that is connected in series to be changed into and be connected in parallel; Adjust the drive current of the light-emitting diode 12 of flowing through, or adopt the method for the adjustment of drive currentization and duty ratio, control flows is through the drive current of light-emitting diode 12.
Because the caloric value of light-emitting diode 12 is directly proportional with the electric power of its consumption, be specially square being directly proportional of 12 li mobile electric currents of power and light-emitting diode of light-emitting diode 12 consumption.Therefore, the relation of the caloric value of light- emitting diode 12 and 12 li mobile drive currents of light-emitting diode, in general as shown in Figure 3, for the increase along with electric current can form the situation that caloric value sharply increases.
For example, the electric current I o that in light-emitting diode 12, flows be under the reduction situation of 60~70% degree of its rated current Is, and the caloric value Qo of this light-emitting diode can be reduced to it below half of the caloric value Qs of the situation that rated current Is flows.In other words, owing to reduce the electric current that flows in the light-emitting diode 12, the heat burden in the light-emitting diode 12 can diminish, and just can prolong its useful life in other words.
Electric current that flows in the light-emitting diode 12 and the relation of its illuminance (brightness) if in the scope of rated current, almost can confirm it is the variation relation of straight linear.Therefore reduce under the situation of the electric current that flows in the light-emitting diode, corollary is that its brightness when luminous also can reduce.
Among the present invention; Problem for the brightness reduction; Adopt the quantity that increases light-emitting diode to remedy, do one here and simply illustrate: be about to a light-emitting diode 12 and adopt two light-emitting diodes 12 of adjacency to replace, flow to respectively in two light-emitting diodes 12 and originally flow to an electric current in the light-emitting diode; Electric current in these two Light-Emitting Diodes 12 in each Light-Emitting Diode 12 is reduced to original half the; The half the of a Light-Emitting Diode 12 originally also reduced in the brightness of same its each Light-Emitting Diode 1, but these two Light-Emitting Diodes 12 can access as a whole with light-emitting diode 12 originally with the brightness of degree, simultaneously; It has realized the caloric value of the light-emitting diode 12 of each is controlled at below 1/4, has promptly increased the useful life of Light-Emitting Diode 12.
And main points of the present invention are even reduce under the situation of the electric current that flows in the light-emitting diode, almost should keep same illuminance.Yet adopt increase light-emitting diode quantity to reduce the electric current in each light-emitting diode, the relation between the increment rate of the reduced rate of the electric current that just relates to and light-emitting diode 12, its correlation is confirmed through overtesting.
The main contents test of setting out is following thus: the packing density increment rate β that in other example 2 and example 3, tries to achieve electric current reduced rate α, light-emitting diode in this test with above-mentioned example 1 as benchmark.The parameter, the following illuminance k that defined that connect between the increment rate β as reduced rate α that relates to electric current and packing density in the present invention:
k=α×β……(1)
Be out of shape the equation of above-mentioned (1):
β=(1/α)×k……(2)
Use the equation of above-mentioned (2), according to utilize in the test or the coefficient of luminous intensity k that in experience, obtains, as target from the reduced rate α of electric current, can dope the increment rate β of the packing density of light-emitting diode.
In current test each numerical value of α, β, k, in the chart of table 1, have representedly, again with reference to this chart, wherein clearly write counter value.
Under the situation of example 2: α=0.832; β=1.200; K=0.998.
Under the situation of example 3: α=0.695; β=1.433; K=0.996.
In this test; The brightness of light-emitting diode 12 and electric current are almost reached direct ratio in the scope of rated current; Utilize this variation; The slip α of electric current and the increment rate β of packing density form the relation that is inversely proportional to each other, that is to say the β that under the situation of k ≈ 1, calculates in advance, and decide the installation quantity of light-emitting diode based on the β in example 2 and the example 3.
Next, the illuminance of each example in current test being described is measured the result.The assay method of illuminance carries out according to the prescriptive procedure of Japanese lighting device illuminance measurement standard " JIS C7612 ", and we use the illuminance analyzer of introducing in " JIS C1609 " the mensuration machine of corresponding relevant illuminance.The result that illuminance is measured in each example is shown in the chart of table 1.In example 2 and example 3 (except that example 1) though reduced the electric current that flows in the light-emitting diode, all determining than example 1 has approximately increased by 1 one-tenth, and other example determines the illuminance of 2 one-tenth of about increases.
In view of such test data, under existing conditions, even with the setting value of coefficient of luminous intensity k be also will be low than above-mentioned numerical value (k ≈ 1) numerical value, with regard to the result, definite substantially illuminance that can obtain to equate of its result.Even i.e. explanation than the reduced rate α of electric current, is controlled at the growth rate β of the packaging density of light-emitting diode under the lower situation, in fact, also can prove substantially to obtain same illuminance.
According to above-mentioned result of the test, estimate to obtain in each example can calculate the correction value k ' of coefficient of luminous intensity under the prerequisite of equal substantially luminous intensity in hypothesis.And, adopt above-mentioned (2) equation based on the correction value k ' of this coefficient of luminous intensity, can calculate the correction value β ' of the increment rate of packing density.K ' that obtains like this and the value of β ' are as shown in table 1, and be same, and according to this correction value β ', it is also as shown in table 1 that quantity is installed in the setting of the light-emitting diode 12 that is drawn in example 2 and the example 3.
As shown in table 1; Setting is in order to obtain almost under the situation with the equal illuminance of the situation of box 1; Coefficient of luminous intensity k '=0.919 of example 2; Coefficient of luminous intensity k '=0.874 of example 3, in conjunction with aforementioned calculation gained coefficient of luminous intensity k, the scope that can tell brightness coefficient k is between 0.8 to 1.0.
In each example of current test, the electric power of its input, be that the input power of the primary side of supply unit 15 all is 21.7W.And the value of the luminous efficiency of each example (lux/W) is also shown in the chart of table 1.In general; The luminous efficiency of the fluorescent lamp of original " 32W+30W " type is about 23 (lux/W); With the luminous efficiency of the fluorescent lamp of existing " 32W+30W " type of the data in the chart of table 1 contrasts, in this test the test data of three kinds of examples in addition we can say obtained very good result.
Moreover with regard to the present invention, according to the Current Control means (not shown) of defined in the light emitting diode illuminating apparatus 10, the electric current that not only offers light-emitting diode can freely be adjusted.Also through and with the temperature inductor of design code and brightness impression device (not shown) and through carrying out Current Feedback Control, can keep offering light-emitting diode 12 appropriate current values.
Plant, should be placed on light source from the nearest place of plant with regard to the indoor growing of plant through its nutrient of synthetic generation of light as far as possible, and the blade face and the sufficient light of rhizome that give plant are selections best in the cultural method.In general, from the light that light source radiation goes out, from the light source to the plant, decay apart from 2 times of inverse proportions of one-tenth.Yet, the caloric value of the lighting device of prior art is too big, according at the placed around lighting device of cultivated plant with from installing the heating situation of coming, the lighting device of prior art can cause damaging blade face and the rhizome of plant.
If adopt lighting device of the present invention, driven for emitting lights diode in adopting the electric current that common rated current is lacked than prior art can control to the caloric value that lighting device sends very low.With regard to the indoor growing facility of plant etc.; If adopt lighting device of the present invention; Even lighting device is arranged on plant blade face and rhizome etc. around (for example: the distance of 10cm degree); The situation of lighting device heating can reduce that cultivated plant is caused damage according to the present invention, and plant light fully also can be provided.
Also have in the present invention,, can reduce the electronic jamming of the electric current of the increase that is directly proportional with drive current because the drive current that in light-emitting diode, flows is less.Say that further the increase of drive current reduces positive voltage of light emitting diode, can reduce the risk of thermal runaway fault.The thermal runaway fault is meant the increase along with electric current, and the heating forward voltage on the PN composition surface of diode can reduce, and situation can be disliked circulation the destroyed situation of electronic component further takes place according to the raising of electric current thus.
According to above explanation; If according to the present invention; Can guarantee and illuminance, its caloric value that the prior art lighting device is almost same especially little, and the life-span of light-emitting diode prolong significantly, also can realize the target of the light emitting diode illuminating apparatus low price that the indoor growing facility is used.
More than the light emitting diode illuminating apparatus of the present invention of explanation can use indoor growing facility plant and vegetables etc., can also be used for the light-emitting diode of field of illuminating device.
Although content of the present invention has been done detailed introduction through above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited appended claim.

Claims (6)

1. light emitting diode illuminating apparatus; It is characterized in that; This lighting device comprises transparent boxes (13), is arranged on the printed circuit board (PCB) (11) in the described transparent boxes (13); And being laid on the some light-emitting diodes (12) on the described printed circuit board (PCB) (11), each light-emitting diode (12) circuit each other connects;
The drive current that described light-emitting diode (12) is adopted be set in this light-emitting diode (12) rated current 55% to 85% between;
Described light-emitting diode (12) is laid on packing density on the printed circuit board (PCB) (11) and is set in 1 square centimeter 1.0 to 1.5.
2. light emitting diode illuminating apparatus according to claim 1 is characterized in that, in this lighting device between the packing density increment rate β of light-emitting diode drive current reduced rate α and light-emitting diode relation be:
β=(1/α)×k
Wherein, k is a coefficient of luminous intensity, and its span is between 0.8 to 1.0;
The numerical value that the numerical value of 1/ α multiply by 0.8 to 1.0 coefficient of luminous intensity k gained can confirm that said printed circuit board (PCB) (11) goes up the packing density increment rate β that lays light-emitting diode (12);
Be increased in the laying quantity of the light-emitting diode (12) on the printed circuit board (PCB) (11) according to this packing density increment rate β, can keep before and after the light-emitting diode drive current reduces in this lighting device the illuminance of light-emitting diode consistent on the whole.
3. light emitting diode illuminating apparatus as claimed in claim 1 is characterized in that this lighting device is used for indoor growing, is provided with 10 centimetres distance between this lighting device and the cultivated plant.
4. light emitting diode illuminating apparatus as claimed in claim 1 is characterized in that, described transparent boxes (13) adopt transparent resin to process, and its surface is made as the structure that can make the radiating light scattering.
5. light emitting diode illuminating apparatus as claimed in claim 1 is characterized in that, described printed circuit board (PCB) (11) adopts printing board PCB, and its surface or the inside are provided with copper foil circuit.
6. light emitting diode illuminating apparatus as claimed in claim 1 is characterized in that, described light-emitting diode (12) adopts the light-emitting diode of the plastic molded type of bullet type.
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JP2013025966A (en) 2013-02-04
CN202652597U (en) 2013-01-02

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