FORM 2
THE PATENTS ACT 1970
(Act 39 of 70)
COMPLETE SPECIFICATION
(See Section 10)
TITLE OF INVENTION:
AN ILLUMINATION SYSTEM
APPLICANT(S):
Name: CTecb Labs Pvt. Ltd.
Nationality: Indian
Address: 1803, Torino,
Hiranandani Gardens, Powai, Mumbai - 400076
The following specification particularly describes the invention and the manner in which it is to be performed.

Title
An Illumination System
Technical Field
This invention relates generally to a system for illumination and specifically to a system having light emitters and reflective surfaces arranged such that lighting efficiency is maximized.
Background
LEDs are increasingly being used in street lighting applications because of their high light output per watt and high color rendition index. Light from LEDs being unidirectional, they do not need traditional reflectors like the ones used in sodium vapour, mercury vapour or fluorescent lights, where the light incident behind the light emitter needs to be reflected towards the front. LEDs despite their unidirectional light have a wide conical light beam. This leads to a lot of wastage of light by throwing light to an area on the ground where it is not needed, for example behind the pole or much beyond the farther edge of the road. The above disadvantages can be overcome by using lenses to confine the light to the width of the road, but the disadvantage with using lenses is that lenses reduce the beam angle, creating sharp edges, dark spots resulting in distraction for the traffic. There is therefore a need to overcome the above disadvantages.

Objectives
1. It is the primary objective of the present invention to improve the lighting efficiency of lighting systems by reducing wastage of light
2. It is another objective of the present invention to control the spread of light along the width of the street
3. It is another objective of the present invention to enable attachment to any surface for illumination of adjacent regions or areas
Summary
According to an aspect of the invention, an illumination system is disclosed. The illumination system comprises a housing, wherein the housing comprises a cavity. The cavity comprises a first surface and a second reflective surface coupled to the first surface along an edge, wherein the first surface and the second reflective surface make an acute angle with each other. The first surface is arranged to hold a plurality of light emitters and the second reflective surface is arranged to reflect illumination from the plurality of light emitters. When in use, the illumination from the plurality of light emitters and illumination reflected from the second surface are incident on a target surface for illumination of the target surface.
Brief Description of Drawings
Exemplary embodiments of the present invention are described hereinafter with reference to the following drawings, in which:
Figure 1 shows atop isometric view of an illumination system
Figure 2 shows an isometric back view of the illumination system of Figure 1

Figure 3 shows an isometric front view of the illumination system of Figure 1
Figure 4 shows an exemplary arrangement of a plurality of light emitters on a first surface and the illumination from the plurality of light emitters reflected by a second reflective surface
Figure 5 shows an exemplary arrangement of the illumination system installed on a street and the resulting light signature
Figure 6 shows a schematic plan view of the exemplary arrangement of Figure 5
■ Figure 7 shows a schematic of the tunable system of the illumination system
Figure 8 shows a schematic of the embodiment of the illumination system
Detailed Description
Figure 1 shows a top isometric view of an illumination system 100. Figure 2 shows an isometric back view of the illumination system 100. Figure 3 shows an isometric front view of the illumination system 100. As illustrated in Figure 1, 2 and 3, the illumination system 100 comprises a housing 110 which houses the elements of the illumination system 100, which will be described hereinafter. The housing 110 comprises a cavity 120, the cavity 120 comprising a first surface 130 and a second surface 140. The second surface 140 is a reflective surface that has the capability of reflecting light incident on the surface. The first surface 130 and the second surface 140 are connected or coupled or attached along an edge 150 common to both the first surface 130 and the second surface 140.

The first surface 130 and the second surface 140 make an acute angle with each other along the edge 150. The first surface 130 has a plurality of light emitter holders 160 arranged to hold a plurality of light emitters (not shown in Figures). The light emitters can be LEDs or Light Emitting Diodes, which are understood by a person skilled in the art. Upon powering up the illumination system 100, the illumination from the plurality of light emitters and illumination reflected from the second surface 140 are incident on a target surface for illumination of the target surface.
The target surface can be a street or a road or any other place which requires illumination. The illumination systems 100 are arranged on one or both sides of the road or street or any lengthy passage. The illumination systems 100 throw illumination or light from the side of the street or road towards the center or the other side of the road. A plurality of the illumination systems 100 can be arranged at an interval along the sides of the street or road, the interval determined based on the light spread or illumination spread from the illumination system 100.
The first surface 130 and the second surface 140 comprise a rectangular profile, with a longer or elongate edge of the first surface 130 and the second surface 140 forming the edge 150. In other words, the first surface 130 and the second surface 140 are connected or coupled along their lengths. The second surface 140 can be curved or planar. The curved second surface 140 can be concave or convex. In the case of a concave second surface 140, the concave surface 140 faces the first surface 130 and the convex surface (not shown) is proximal to the wall of the cavity 120. In the case of a convex second surface 140, the convex surface 140 faces the first surface 130 and the concave surface is proximal to the wall of the cavity 120. When compared to the concave second surface 140, the convex second surface 140 generates a greater spread of light on the target area or target region, which is understood by the person skilled in art.

Figure 3 illustrates the plurality of light emitter holders 160 arranged in a single row. Alternatively, the plurality of light emitter holders 160 can be arranged in more than a single row as well. For example, there can be two rows of light emitter holders 160 or three rows of light emitter holders 160. In the case of more than one row of light emitter holders, the illumination from the emitters held in the more than one row of light emitter holders are reflected by the second surface 140.
The plurality of light emitters which can be held in the plurality of light emitter holders 160 are supplied with electrical energy, when the illumination system 100 is in use. The sources of electrical energy can be solar energy which has been stored in a suitable electrical storage device such as a battery pack, energy from a battery or a battery pack or electrical energy directly from the electrical grid.
As illustrated in Figure 1, Figure 2 and Figure 3, the illumination system can further comprise a fastening structure 170 to enable connecting or fixing or fastening the illumination system 100 to any one of a light pole, wall or any elevated structure for throwing illumination onto the target surface. In the exemplary embodiment as illustrated in Figure 1, Figure 2 and Figure 3, the fastening structure 170 is in the form of an elongate cylindrical structure which can be fit onto a pole for fastening the illumination system 100 to the pole. The above example of the fastening structure 170 is just an example and the fastening structure 170 can be in any form depending on the surface of structure to which the illumination system 100 is attached to. For example, if the illumination system 100 is to be attached to a wall, the fastening structure 170 can be in the form of a plate attached to the housing 110 in any orientation.
Figure 4 shows an exemplary arrangement of a plurality of light emitters on the first surface 130 and the illumination from the plurality of light emitters reflected by a second reflective surface 140. In this exemplary embodiment, the first surface 130 comprises two rows of light emitter holders 160 with light emitters

arranged on the light emitter holders 160. The second reflective surface 140 is curved and the concave surface is towards the first surface 130. The interval between the two rows of light emitter holders is 20mm. One of the light emitter holder row is 6.5mm from the edge 150. Light or illumination from each of the plurality of light emitters is spread over an angle of 120°. It is apparent from Figure 4 that illumination from the plurality of light emitters escapes the illumination system 100 both directly from the light emitter and upon reflection from the second reflective surface 140. For the purposes of visualization, Dl and D2 are light rays from the light emitters directly and Rl and R2 are light rays reflected from the second reflective surface 140. The subtended angle for one of the plurality of light emitters is 62° and for another one of the plurality of light emitters is 54°. The subtended angle is a property of the LEDs which can be any one of 60°, 120° and 150°. These are just examples and the subtended angle can be anything else depending on the LED, which is understood by the person skilled in the art.
Figure 5 shows an exemplary arrangement of the illumination system 100 installed on a street 180 and the resulting light signature on the street. As illustrated in Figure 5, the illumination system 100 is installed 2.6m above the level of a street 180. The output wattage of the illumination system 100 is 12W. The angle subtended by the row of light emitters in the illumination system 100 is 62°. The width of the street 180 is 8m. The illumination system 100 throws bright light on 4m adjacent to the illumination system 100 and diffuse light on the remaining 4m of the street width. The bright light is a result of a specified distance or lesser between the illumination system 100 and the road or street surface and the diffuse light is the result of a distance greater than the specified distance between the illumination system 100 and the road or street surface. As explained earlier, this configuration is merely exemplary and the illumination system can be arranged in any different configuration suitable to the width of the street available and the height available for positioning the illumination system 100.

Figure 6 shows a schematic plan view of the exemplary arrangement of Figure 5. As illustrated in Figure 6, the exemplary arrangement as described above with respect to Figure 5, throws illumination for a length of 12m, the illumination being dense and concentrated towards the center of the 12m. Variations in the subtended angle, output wattage and the height of the illumination system vary the amount of space on which the light or illumination is thrown. The amount if space includes both the width of the street and the length of the street on which the light is thrown. In another exemplary arrangement, when the subtended angle is 54° and the output wattage is 6W, the total street width that is served by the illumination system 100 is 4m and the total street length that is served by the illumination system 100 is 10m.
It is therefore apparent that the illumination system 100 enables positioning of the light emitters in the housing 110 such that part of the light or illumination directly falls on the width of the road or the street. The spread of light along the length of the road or street is not affected. The reflection of another portion of light by the second surface 140 towards the street increases the utilization of the light. In other words, the illumination system 100 reduces the wastage of light thereby improving lighting efficiency.
The fastening structure 170 as illustrated in Figure 1, Figure 2 and Figure 3 also reduces the complexity in mounting the illumination system 100 to the pole.
Figure 7 shows a tunable system for adjusting the second surface 140 of the illumination system 100. The second surface 140 can be varied in shape from being curved to planar or vice-versa. The second surface 140 is mounted on a supporting surface 142. The shape of the second surface 140 is adjusted by rotating the bolt head 143 clockwise or anti-clockwise using the bolt-frame syatem l41. The bolt-frame system 141 is coupled with the second surface 140 and the supporting surface 142 as shown in figure 7. In figure 7, the bolt-frame syateml41 is attached at the center of second surface 140 which can be attached

towards either end of the second surface 140 depending on the need of light distribution. This provides more flexibility in adjusting the light signature provided by the illumination system 100 onsite.
Figure 8 shows an embodiment of the illumination system 100 in a pillar 50. The illumination system 100 can be fixed anywhere on the pillar 50, depending on the need of light distribution.
It is to be understood that the foregoing description is intended to be purely illustrative of the principles of the disclosed techniques, rather than exhaustive thereof, and that changes and variations will be apparent to those skilled in the art, and that the present invention is not intended to be limited other than as expressly set forth in the following claims.

We Claim
1. An illumination system, comprising:
a housing comprising a cavity, the cavity comprising:
a first surface and a second reflective surface coupled to the first
surface along an edge, the first surface and the second surface
making an acute angle with each other, wherein the first surface is
arranged to hold a plurality of light emitters and the second
reflective surface is arranged to reflect illumination from the
plurality of light emitters;
wherein, when in use, the illumination from the plurality of light emitters and
illumination reflected from the second surface are incident on a target surface
for illumination of the target surface.
2. The illumination system as claimed in claim 1, wherein the first surface and the second surface comprise a rectangular profile, with the edge at which the first surface and the second surface are coupled being an elongate edge.
3. The illumination system as claimed in claim 2, wherein the second reflective surface is concave.
4. The illumination system as claimed in claim 2, wherein the second reflective surface is planar.

5. The illumination system as claimed in claim 2, wherein the first surface comprises a plurality of holders for accommodating the plurality of light emitters.
6. The illumination system as claimed in claim 5, wherein the plurality of holders are arranged in one or more rows.

7. The illumination system as claimed in claim 6, wherein the plurality of holders are supplied with electrical power for powering the plurality of light emitters.
8. The illumination system as claimed in claim 7, wherein the electrical power can be any one of stored solar power, battery power and grid power.
9. The illumination system as claimed in claim 1, the housing further comprising a fastening arrangement external to the cavity for enabling fastening to any one of a light pole and a wall.