CN101858557A - Secondary optical lens of LED street lamp and design method thereof - Google Patents
Secondary optical lens of LED street lamp and design method thereof Download PDFInfo
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- CN101858557A CN101858557A CN201010205870A CN201010205870A CN101858557A CN 101858557 A CN101858557 A CN 101858557A CN 201010205870 A CN201010205870 A CN 201010205870A CN 201010205870 A CN201010205870 A CN 201010205870A CN 101858557 A CN101858557 A CN 101858557A
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- lens
- basal plane
- road
- street lamp
- plane
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/10—Outdoor lighting
- F21W2131/103—Outdoor lighting of streets or roads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention relates to a secondary optical lens of an LED street lamp. The lens is provided with an outer surface, a base face and an inner surface which define an integral structure of the lens together; the outer surface consists of two local ellipsoidal surfaces and a transition surface between the two local ellipsoidal surfaces; the base face is a plane and is crossed with the outer surface to form a boundary line of the base face; the inner surface is positioned in the center of the base face and consists of non-hemispherical special curved indents with different curvature radiuses in two directions along a road extending direction and vertical to the road extending direction; the inner surface is symmetrical in front and back, left and right relative to a normal vertical to the base face and passing through the center of the base face; and the outer surface has a symmetric plane passing through an ellipsoidal center connecting line of the two local ellipsoidal surfaces of the outer surface, and an included angle of the symmetric plane and the base face is 60 and 90 degrees.
Description
Technical field
The present invention relates to LED illumination application, particularly a kind of LED street lamp secondary optical lens and method for designing thereof.
Background technology
Along with energy-saving and emission-reduction, the development trend of environmental protection, LED (Light Emitting Diodes, light emitting diode) with its energy-conserving and environment-protective, luminous efficiency height, long, colour rendering index advantages of higher of life-span, obtain application more and more widely, LED is having the trend that replaces conventional road lamp light source (high-pressure mercury lamp, high-pressure sodium lamp and Metal halogen lamp etc.) greatly as a kind of novel solid light source aspect the city illumination light source.
Yet, the luminous of LED street lamp is to be combined by single led light source (finishing the encapsulated LED chip one time), belong to Lambertian source owing to generally be applied to the led light source of street lamp, light emission direction is strong, at distance road surface certain altitude and perpendicular to the road surface when luminous, can only on the road surface, form a less circular light spot, brightness is outwards sharply reduced by the center of circle, illumination uniformity is low, therefore need in addition secondary optics design, make it on the road surface, form a bigger uniform light spots, because have only rectangular light spot could on the road surface, realize seamless link near rectangle, evenly, reach the optimal illumination effect according to full entire road.
Selecting for use lens to carry out the secondary optics design is the most direct effective method, but prior art is often only carried out the outer surface design of lens, and has ignored the design that lens basal plane central authorities are used to place the concave surface (inner surface) of led light source.Only the lens design at outer surface has limited lens send light direction and light spot shape to LED improvement, can not control the distribution of emergent ray well, thereby make that shining the light spot shape that forms on the road surface keeps off desirable rectangle, and uniformity is not good.
Second deficiency of prior art is the edge that street lamp is installed in road one side when not considering the real road application, but not road central authorities, adopt the prior art of symmetric design just can not play a role in this occasion, because the hot spot that prior art forms on the road surface is all around, a relative street lamp installation site symmetry respectively, and street lamp is in road edge, must have a big chunk light like this and be radiated at outside the road surface, cause the waste of luminous energy, reduce light efficiency.And only by street lamp cap tilt to place not only can not be perfect address this problem, also cause the distortion of road surface light spot shape, changed over trapezoidally by rectangle, make illumination uniformity descend.
Therefore, be necessary to provide a kind of LED street lamp secondary optical lens of improvement and the lens arrangement method for designing that designs based on inner surface thereof, so that overcome the deficiencies in the prior art.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, and provide a kind of illuminating effect good, can support a kind of LED street lamp secondary optical lens of most street lamp mounting means and the lens arrangement method for designing that designs based on inner surface thereof.
A kind of LED street lamp secondary optical lens is characterized in that:
Have an outer surface, a basal plane and an inner surface, the three defines the unitary construction of described lens jointly;
Described outer surface by two local ellipsoids and between excessive face form;
Described basal plane is a plane, and basal plane and described outer surface intersect, and forms the boundary line of basal plane;
Described inner surface is positioned at the central authorities of described basal plane, by non-hemispheric, forming along the road bearing of trend with perpendicular to the special surface indent inequality of the radius of curvature on this both direction of road bearing of trend;
Described inner surface is distinguished symmetry with respect to one perpendicular to described basal plane and by the normal all around at basal plane center;
There is the plane of symmetry by the ellipsoid line of centres of two local ellipsoids of described outer surface in described outer surface, and the angle of this plane of symmetry and basal plane is 60 °～90 °.
Described a kind of LED street lamp secondary optical lens method for designing is divided into following step:
The first step, shine the primary condition that forms uniform rectangular light spot according to the characteristics of luminescence of LED Lambertian source with on the road surface, according to the law of refraction and law of conservation of energy, the supposition led light source is a spot light earlier, described inner lens surfaces is the hemispherical indent, light source is positioned at inner surface centre of sphere place, the outer surface that utilizes the conservation of energy principle and the law of refraction can simply calculate described secondary optical lens then is the high order free form surface of typical similar double spherical, owing to consider the Project Realization difficulty of high order free form surface, with its be reduced to described outer surface by two local ellipsoids and between excessive face form.
Second step, because when the aforementioned calculation external surface shape, used approximation method such as spot light, and actual led light source is the body light source, so need carry out some modifications to the unitary construction of the described lens that calculate, the shape of inner lens surfaces particularly, scheme is to determine that described external surface shape is constant, makes lens can reach the equally distributed requirement of bright dipping and regulation and control spot size, shape by revising described inner surface configuration.
Concrete grammar is (seeing Fig. 9 software flow pattern):
(1), the external surface shape of determining lens all the time be by two local ellipsoids and between excessive face form, this is that the present invention carries out the basis that inner surface is revised, because the outer surface of this shape has guaranteed can form on the road surface hot spot of nearly rectangle substantially, remaining optimization work is to improve the uniformity and require regulation and control spot size and shape according to reality by revising inner surface configuration;
(2), according to the actual requirement of road lighting, for example to the requirement of field of illumination area size etc., determine that roughly inner surface is along road direction with perpendicular to the scope of the radius of curvature value of the cross section contour on the road direction both direction;
(3), in above-mentioned scope selected any two values, utilize on the market existing modeling software to set up inner surface 3D model;
(4), above-mentioned model is imported on the market in the existing optical design software, and synthesize lens model with fixed outer surface model group and carry out ray tracing, and the result that obtains of analytical test;
(5), according to above-mentioned test result, revise the curvature selected radius value, set up inner surface 3D model once more according to amended value, repetitive cycling (4), (5) step then, the analog result of the lens that the inner surface that obtains until modification is formed satisfies above-mentioned actual requirement.Because above-mentioned once circulation can be finished at short notice, can under the condition of expensive time not, repeat a large amount of circulating analog processes, thereby obtain suitable inner lens surfaces shape.
For the actual requirement of different road lightings, the shape of inner surface is also corresponding different.Generally speaking, described inner surface is by non-hemispheric, forming along the road bearing of trend with perpendicular to the special surface indent inequality of the radius of curvature on this both direction of road bearing of trend, the difference of radius of curvature causes the photodistributed difference of outgoing on all directions on the different directions, thereby the spot size that forms on the road surface is also different.
The 3rd goes on foot, described inside and outside surface and basal plane simple combination is in the same place, and the three defines the unitary construction of described lens jointly.
The invention has the advantages that: utilize above-mentioned LED street lamp secondary optical lens, by selecting the inner surface of different particular design for use, the spot size that regulation and control form on the road surface, shape, satisfy the actual demand in different road lightings zone, irradiation forms brightness rectangular light spot comparatively uniformly on the road surface, cover the zone of all lighting requirements, and the unwanted light that can effectively reduce outside the lighting requirement zone distributes, improve the efficiency of light energy utilization, energy savings; And, adopt unique adjustable asymmetric design, make under different road street lamp mounting conditions, can satisfy above-mentioned advantage.Not only can satisfy road illumination standards by the described LED secondary optical lens that obtains based on the lens arrangement method for designing of inner surface design, can also be by revising described inner surface configuration, the spot size that regulation and control form on the road surface, shape satisfy the actual demand in different road lightings zone.
Description of drawings
Fig. 1 is the stereogram of first embodiment of a kind of LED street lamp of the present invention secondary optical lens from top view;
Fig. 2 is the stereogram that a kind of first embodiment of LED street lamp secondary optical lens shown in Figure 1 observes from the bottom;
Fig. 3 is the vertical view of a kind of first embodiment of LED street lamp secondary optical lens shown in Figure 1;
Fig. 4 is an A-A face cutaway view shown in Figure 3;
Fig. 5 is a B-B face cutaway view shown in Figure 3;
Fig. 6 is the stereogram of second embodiment of a kind of LED street lamp of the present invention secondary optical lens from top view;
Fig. 7 is the side view of the 3rd embodiment of a kind of LED street lamp of the present invention secondary optical lens;
Fig. 8 is the polar coordinates distribution curve flux figure of the 3rd embodiment of a kind of LED street lamp of the present invention secondary optical lens;
Fig. 9 is the inner surface design flow diagram of a kind of LED street lamp of the present invention secondary optical lens.
Concrete label is as follows among the figure:
10,11, optical lens 20,21, outer surface 201,202, local ellipsoid
203, excessive face 30, basal plane 40,41, inner surface
The specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
Embodiment one:
Referring to figs. 1 to Fig. 5, a kind of first embodiment of LED street lamp secondary optical lens provided by the invention has an outer surface 20, a basal plane 30 and an inner surface 40, and the three defines the unitary construction 10 of described first embodiment of lens jointly;
Described outer surface 20 by two local ellipsoids 201,202 and between excessive face 203 form;
Described basal plane 30 is a plane, and basal plane 30 intersects with described outer surface 20, forms the boundary line of basal plane;
Described inner surface 40 is positioned at the central authorities of described basal plane 30, by non-hemispheric, forming along the road bearing of trend with perpendicular to the special surface indent inequality of the radius of curvature on this both direction of road bearing of trend, herein first embodiment by less two the local ellipsoids of the similar outer surface of shape and between excessive face indent form, it is along road bearing of trend and inequality perpendicular to the radius of curvature on this both direction of road bearing of trend;
The ellipsoid center line connecting direction of two local ellipsoids of described inner surface 40 is perpendicular to the ellipsoid center line connecting direction of two local ellipsoids of described outer surface 20;
Described inner surface 40 is distinguished symmetry with respect to one perpendicular to described basal plane 30 and by the normal all around at basal plane 30 centers;
There is the plane of symmetry (A-A face shown in Figure 3) by the described outer surface 20 ellipsoid lines of centres in described outer surface 20, the angle of this plane of symmetry and basal plane 30 is 60 °～90 °, Fig. 1 is to Figure 5 shows that first embodiment of the present invention, described outer surface 20 planes of symmetry and basal plane 30 angles of this embodiment are 90 °, light source sees through described relatively outer surface 20 plane of symmetry symmetries of emergent light distribution of this example, and the hot spot that forms on the road surface is also symmetrical respectively with respect to all around, street lamp installation site.
Embodiment two:
With reference to shown in Figure 6, the outer surface 20 of second embodiment of the present invention is identical with the outer surface 20 of first embodiment of the invention, by two local ellipsoids and between excessive face form, but the inner surface 41 of second embodiment is different from the inner surface 40 of first embodiment.
Shown in figure 9 flow charts, suppose that the second embodiment road corresponding lighting requirement is: the length-width ratio in rectangular illumination zone is bigger, and promptly the width on road surface is less, and length is bigger.The fixing height on inner surface summit, if certain direction cross section contour radius of curvature is greater than this height value, then lens can make the light dispersion angle on this direction reduce; Otherwise,, then can increase the light angle of divergence on this direction if less than height value.
So determine the radius of curvature ρ of inner lens surfaces earlier along the road bearing of trend
1Radius of curvature ρ with vertical road bearing of trend
2Span be: ρ
1＜h＜ρ
2, wherein h is the height value of said fixing.
Then, from this span, choose ρ arbitrarily
1And ρ
2Initial value, and in modeling software, set up corresponding inner surface 3D model with this.
Again it is directed in the optical design software, and synthesizes lens model, carry out ray tracing, obtain the simulation test result with the outer surface model group.
Analyze this result and whether satisfy the design road lighting various requirement of supposition just, for example whether hot spot can cover the illuminated zone of occupying requirement, and whether too many etc., if do not satisfy, then revise ρ if leaking the unwanted light penetrated outside the road surface
1And ρ
2Value, then repeat the step of modeling and ray tracing, until meeting design requirement substantially.
Through a large amount of circulating analog processes, the inner lens surfaces of final definite second embodiment is formed by a half ellipsoidal surface indent, described half ellipsoidal surface is a short-axis direction along the road bearing of trend, and vertical road bearing of trend is a long axis direction, the radius of curvature ρ of described long axis direction
2Radius of curvature ρ greater than short-axis direction
1, and ρ
1, ρ
2Occurrence utilize said method specially to determine according to actual requirement of illumination.Described long axis direction is perpendicular to the ellipsoid center line connecting direction of two local ellipsoids of described outer surface; The described basal plane of described inner surface 41 relative mistakes 30 centers, symmetrical respectively perpendicular to the normal all around of basal plane 30; Described outer surface 20 planes of symmetry and basal plane 30 angles are 90 °;
Described outer surface 20, basal plane 30 and inner surface 41 threes define the unitary construction 11 of second embodiment of described lens jointly.
Embodiment three:
With reference to shown in Figure 7, described outer surface 21 planes of symmetry of the 3rd embodiment of the present invention and basal plane 30 angles are that 75 ° of references are shown in Figure 8,0 ° of (solid line) curve is the distribution curve flux along the road bearing of trend among the figure, and 90 ° (dotted line) is the distribution curve flux perpendicular to the road bearing of trend.Shown in above-mentioned 90 ° of distribution curve fluxs, the emergent light of the 3rd example is along also asymmetric with respect to street lamp installation site (polar coordinates are 0 among Fig. 6) perpendicular to the road bearing of trend, overwhelming majority light only is distributed in a side, this just in time is fit to some street lamps that are installed in road one lateral edges or street lamp cap inclination installation, because for this mounting condition, asymmetric light distributes and could effectively reduce the invalid light distribution that is radiated at outside the lighting requirement, improves the efficiency of light energy utilization, energy savings.
Led light source is placed on the central authorities of described basal plane 30, and described led light source luminous component stretches into the indent zone that is formed by described inner surface fully, and described led light source base plane is placed parallel with described basal plane 30.
Light that led light source sends is through described inner surface and outer surface 20 common refraction, reflex, by described lens outgoing to the road surface, on the road surface, form brightness rectangular light spot comparatively uniformly, cover whole lighting requirement zone, the unwanted light that effectively reduces outside the lighting requirement zone distributes, improve the efficiency of light energy utilization, energy savings.
Described a kind of LED street lamp secondary optical lens adopts optical grade material PC or PMMA injection mo(u)lding.
Above disclosed only is three preferred embodiments of the present invention, and covering scope of the present invention is far longer than above-mentioned three embodiment.
The present invention selects different inner surfaces for use according to the real road lighting requirement, described inner surface is by non-hemispheric, forming along the road bearing of trend with perpendicular to the special surface indent inequality of the radius of curvature on this both direction of road bearing of trend, the difference of radius of curvature causes the photodistributed difference of outgoing on all directions on the different directions, thereby the spot size that forms on the road surface is also different.So spot size, shape that the inner surface by selecting different particular design for use forms on can road pavement are regulated and control, and are reaching under the prerequisite of road illumination standards, to satisfy the actual demand of different road lighting areas.
The present invention can also adjust the plane of symmetry of described outer surface 20 and the corner dimension of basal plane 30 according to the real road application conditions, thereby obtains being fit to the street lamp LED street lamp secondary optical lens of various mounting conditions simply and easily.
Claims (2)
1. LED street lamp secondary optical lens, it is characterized in that: these lens have an outer surface, a basal plane and an inner surface, the three defines the unitary construction of described lens jointly;
Described outer surface by two local ellipsoids and between excessive face form;
Described basal plane is a plane, and basal plane and described outer surface intersect, and forms the boundary line of basal plane;
Described inner surface is positioned at the central authorities of described basal plane, by non-hemispheric, forming along the road bearing of trend with perpendicular to the special surface indent inequality of the radius of curvature on this both direction of road bearing of trend;
Described inner surface is distinguished symmetry with respect to one perpendicular to described basal plane and by the normal all around at basal plane center;
There is the plane of symmetry by the ellipsoid line of centres of two local ellipsoids of described outer surface in described outer surface, and the angle of this plane of symmetry and basal plane is 60 °～90 °.
2. LED street lamp secondary optical lens method for designing, it is characterized in that: this method comprises following step:
The first step: shine the primary condition that forms uniform rectangular light spot according to the characteristics of luminescence of LED Lambertian source with on the road surface, according to the law of refraction and law of conservation of energy, the supposition led light source is a spot light earlier, described inner lens surfaces is the hemispherical indent, light source is positioned at inner surface centre of sphere place, the outer surface that utilizes the conservation of energy principle and the law of refraction can simply calculate described secondary optical lens then is the high order free form surface of typical similar double spherical, owing to consider the Project Realization difficulty of high order free form surface, with its be reduced to described outer surface by two local ellipsoids and between excessive face form;
Second step: the unitary construction of the described lens that the first step is calculated is made amendment, the shape of inner lens surfaces particularly, scheme is to determine that described external surface shape is constant, makes lens can reach the equally distributed requirement of bright dipping and regulation and control spot size, shape by revising described inner surface configuration;
The 3rd step: described inside and outside surface and basal plane simple combination are in the same place, and the three defines the unitary construction of described lens jointly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102058704A CN101858557B (en) | 2010-06-12 | 2010-06-12 | Secondary optical lens of LED street lamp and design method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102058704A CN101858557B (en) | 2010-06-12 | 2010-06-12 | Secondary optical lens of LED street lamp and design method thereof |
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| Publication Number | Publication Date |
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| CN101858557A true CN101858557A (en) | 2010-10-13 |
| CN101858557B CN101858557B (en) | 2012-01-04 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986018A (en) * | 2010-11-03 | 2011-03-16 | 吴峰 | Wide light distribution angle lens unit and module of light-emitting diode street lamp |
| CN102494298A (en) * | 2011-11-29 | 2012-06-13 | 天津工业大学 | Design method of array free curved lens for LED street lamp |
| CN102644899A (en) * | 2011-02-18 | 2012-08-22 | 上海三思电子工程有限公司 | Design method of light-emitting diode (LED) illuminating lens |
| CN102997181A (en) * | 2012-12-12 | 2013-03-27 | 四川华体照明科技股份有限公司 | Combined LED (Light-Emitting Diode) optical lens and design method thereof |
| CN103335276A (en) * | 2013-07-26 | 2013-10-02 | 苏州东山精密制造股份有限公司 | LED (light emitting diode) streetlamp lens and LED streetlamp system |
| CN103672576A (en) * | 2012-09-13 | 2014-03-26 | 大连工业大学 | Modularized optical system of LED street lamp |
| CN104421836A (en) * | 2013-09-05 | 2015-03-18 | 江苏积汇新能源科技有限公司 | Universal LED lens |
| CN104949066A (en) * | 2015-06-30 | 2015-09-30 | 上海睿铄光电科技有限公司 | LED street lamp lens high in traffic lane luminance uniformity and high in sidewalk luminance uniformity |
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| US20030161047A1 (en) * | 2002-02-26 | 2003-08-28 | Chih-Kung Lee | Optical apparatus having multiple arrays of one-dimensional optical elements |
| CN201255364Y (en) * | 2008-09-03 | 2009-06-10 | 浙江名芯半导体科技有限公司 | Lens of LED lamp for road illumination |
| CN101684920A (en) * | 2009-07-16 | 2010-03-31 | 江苏伯乐达光电科技有限公司 | Optical system for LED street lamp |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030161047A1 (en) * | 2002-02-26 | 2003-08-28 | Chih-Kung Lee | Optical apparatus having multiple arrays of one-dimensional optical elements |
| CN201255364Y (en) * | 2008-09-03 | 2009-06-10 | 浙江名芯半导体科技有限公司 | Lens of LED lamp for road illumination |
| CN101684920A (en) * | 2009-07-16 | 2010-03-31 | 江苏伯乐达光电科技有限公司 | Optical system for LED street lamp |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986018A (en) * | 2010-11-03 | 2011-03-16 | 吴峰 | Wide light distribution angle lens unit and module of light-emitting diode street lamp |
| CN102644899A (en) * | 2011-02-18 | 2012-08-22 | 上海三思电子工程有限公司 | Design method of light-emitting diode (LED) illuminating lens |
| CN102644899B (en) * | 2011-02-18 | 2013-07-31 | 上海三思电子工程有限公司 | Design method of light-emitting diode (LED) illuminating lens |
| CN102494298A (en) * | 2011-11-29 | 2012-06-13 | 天津工业大学 | Design method of array free curved lens for LED street lamp |
| CN103672576A (en) * | 2012-09-13 | 2014-03-26 | 大连工业大学 | Modularized optical system of LED street lamp |
| CN103672576B (en) * | 2012-09-13 | 2015-12-09 | 大连工业大学 | A kind of optical system of Modular LED street lamp |
| CN102997181A (en) * | 2012-12-12 | 2013-03-27 | 四川华体照明科技股份有限公司 | Combined LED (Light-Emitting Diode) optical lens and design method thereof |
| CN103335276B (en) * | 2013-07-26 | 2015-08-12 | 苏州东山精密制造股份有限公司 | A kind of LED street lamp lens and LED street lamp system |
| CN103335276A (en) * | 2013-07-26 | 2013-10-02 | 苏州东山精密制造股份有限公司 | LED (light emitting diode) streetlamp lens and LED streetlamp system |
| CN104421836A (en) * | 2013-09-05 | 2015-03-18 | 江苏积汇新能源科技有限公司 | Universal LED lens |
| CN104421836B (en) * | 2013-09-05 | 2018-03-13 | 江苏积汇新能源科技有限公司 | A kind of Universal LED lens |
| CN104949066A (en) * | 2015-06-30 | 2015-09-30 | 上海睿铄光电科技有限公司 | LED street lamp lens high in traffic lane luminance uniformity and high in sidewalk luminance uniformity |
| CN104949066B (en) * | 2015-06-30 | 2018-11-23 | 上海睿铄光电科技有限公司 | Runway high brightness uniformity pavement high illumination uniformity LED street lamp lens |
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| CN101858557B (en) | 2012-01-04 |
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