Lamps with the light curve reflects the ability to control light distribution of lamps. In order to achieve the architect required lighting effects, departure from the lighting effects study of the distribution curve of the lamp.
Lighting effects on the light distribution curve
Water Cube, a building, architects, uniform surface brightness. From that point, we explore the requirements of the candela distribution.
A variety of lamps light projected onto the shape of the illuminated surface, the formation of a certain shape of the light-section, the optical cross-section depends on the lighting of the light distribution curve. Now the lamp light distribution curve, the shape of the optical cross-section is roughly circular, oval, rectangular, etc.. From the uniform to keep the lights on, if the spot is rectangular, arranged according to a certain vertical and horizontal distance light table tennis equipment, allows lamps between spot electric Lu: nor dead zone, bad as long as each lamp irradiation barge region to ensure uniformity, will ensure the uniformity of the whole break. If the optical cross-section is circular, in order to eliminate dead, projected area between the lamps must be part of the electric urn, so there will be less than the area of ??the lamp radiation, a single light exposure area, Man, there are two light irradiation overlapping area, so to ensure that uniformity is difficult to If the optical cross-section is oval, between the rectangular and round between the two.
Optical design of the traditional light source lamp
The optical design of the conventional light source lamp reflector to control the light distribution.
1) reflector basic form of
The oval reflector, Wang spherical reflector, dual-surface reflector, parabolic reflector
(2) the optical properties of reflector
Spherical reflector, the light source placed in the ball, blind heart, the light came back and the normal direction.
Elliptical surface reflector, when the light source placed in any one focus, gathered at the focus of another ... and outward diffusion of the light reflected by an oval face.
The parabolic reflector, the light source placed in the focus the light through parabolic reflector are parallel - axis.
Hyperboloid reflector, the light source placed in the focus of divergent light after surface reflection.
(3) materials and their optical properties of the lamp reflector
The lamp reflector materials most widely used is aluminum, aluminum cattle rust, light texture, easy processing and molding. After plating, mechanical, chemical and other process polished, with high reflectivity, with good mirror. ;. Other materials to make reflector
The basic method of the second optical design of LED lamps
The second optical design of LED lamps in general, 1,: in several ways: the LED + optical lens, the LED + reflector, LED + reflector + optical lens.
(1) LED light source, an optical design
LED and conventional light sources, the difference is that it is in the package, ie With an optical design power LED optical design time, essentially - optical lens. Once the lens is directly encapsulated (or bonding) kept the LED chip bracket Bu become a whole and LED. LED chip (chip) according to the theory of light-emitting angle is 360 degrees, but in fact the chip placed in the LED bracket to be fixed and packaging, chip emitting angle is 180 degrees, the other chip will have some stray light: line, This single lens light can effectively collect the chip can be 160 degrees, 140 degrees, 120 degrees, 90 degrees or 60 degrees (different needs), light emitting angles. A lens with more than PMMA or silicone materials.
Second optical design of LED lamps
In order to achieve a certain degree of light distribution curve, the basis of L-optical design, LED lamps need to carry out the second optical design. I.FD lamps secondary optical design, in addition to the use of reflector, the optical lens or a combination of both.
â' LED_-optical lens material type:
a. Silicone lens
High temperature resistant silicone (reflow), so commonly used direct encapsulation of the LED chip: General silicone lenses are smaller in diameter 3-lOmm.
and b. PMMA lens
Optical level the PMM (poly (methyl methacrylate), commonly known as: acrylic). Plastic material advantages: high efficiency (through injection): high transmittance (3mm thickness of about 93% penetration); Disadvantages: temperature 70% (heat distortion temperature of 90 degrees).
(c) PC lens
Optical-grade nylon Polycarbonate (referred to as PC) polycarbonate. Plasti c material advantages: high efficiency
(Which can be completed by Note frown): lettuce is rendered temperature (above 130 degrees): Disadvantages: the end of the light transmission rate (87%):
(d) Glass Lens
Optical glass material with higher heat resistance characteristics of high transmittance (97%), Disadvantages: fragile, aspherical precision is not easy to achieve, now low, the efficiency of cattle production costs higher.
â'© LED tuna valve j, the rule-like
The second lens LE1 two separate objects, they indeed inseparable from the application of the second lens of the function j is the FD of the angle light begging (usually 90-120 degrees) again condenser into five degrees to 80 degrees any desired angle. The second through the material mostly with PMMA or glass.
a. Transmission
Anti-born light when the LED light through the lens refraction condenser, and when the distance between the adjustment of the lens and the LED on the angle wi ll change (inversely proportional), the surface spot after aspheric technology will be very uniform, but because the limitations of the lens diameter, lens side light can not use the (leaked). General application in the wide-angle (40-80 degrees) condenser, such as lamps, street lights, interior lighting, etc..
Transmission optical lens have the following forms: plano-convex lens, flat doors lens, double convex, double concave lens, fresnel lens, cylindrical lens.
. Total internal reflection (cone called the cup)
With transmission condenser lens design in the front, conical surface can be edge-lit all collected and reflected off the two kinds of light electric stack (the same angle) can get the most perfect use of light and beautiful spot effect. In the conical surface of a lens do change, can be designed into the mirror, matte sorrowful, the bead su rface, the grain surface, the thread surface, convex or concave, etc. to get a different spot effect.
(c) LED lens module
The number of single lens through injection ... a whole long lens, according to the different needs of {module designed 3-in-l, 5-in-1 or even several \\ pieces together - the lens,
LED lamps commonly used form of reflector
LED lamps commonly used reflector is. The next several reflector: spherical, parabolic, compound parabolic (the Compound Parabolic c Concentrator, CPC), the groove of the parabolic free surface reflector, and so on.
â'£ lens options
a. The lens material selection: the selection of optical lens P deletion A (acrylic), optical glass.
and b. Lens optical parameter selection:
Window diameter, the lens focal length, angle of light, pitch (Fresnel lens), red, green, blue, relative light intensity curve, the mixing of light from the light mixing uniformity, transmittance, j yellowing rate.
Light an gle and the lighting of the lamps with light Zhuang effect.
The requirements of the Monastery, building landscape lighting, water tender documents on the LFD lighting optical properties
(1) the overall light failure: 10,000 hours does not exceed 10% () (light output to maintain more than 90%), 30 000 small-time decline to no more than 30 () 0 (light output to maintain more than 70%)
(2) the lens: the selection of optical lens PMMA (acryl juice, optical glass), light transmission angle and the lighting effect of the light distribution curve lamps should be based on the air pillow shape, size and different plating point rate achieved Scene requested to use with light suitable optical lens: light mixing uniformity requirements can not be the phenomenon of color separation, mixing of light from the requirements to less than 300 - 500mm: transmittance ratio: ≥ 85%, yellow rate: 30000h after ≤ 5% .
(3) Lighting efficiency: ≥ ≥ 80% (ie, k, the I with the output luminous flux not less than the packaged chip output light amount 80Q0)
(4) Service life: ≥ 30 000 hours.
4.5 s Water Cube lighting â…¡ process used I.FD lamps
The successful bidder according to the requirements of the bidding really f cattle, developed three models of lamps, lighting technical parameters, the shape of the shape and size with the light curve, as shown in this article 3.4.
4.5. 6LED asymmetric light distribution lamp
(1) symmetric light distribution, fL symmetric light distribution
In the previous lamps, most symmetrical light distribution. With the development of science and technology, asymmetric
(2) LED asymmetric light distribution lamp
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