FIELD OF INVENTION
The present invention generally relates to electrically powered luminaires adapted for indoor use. More specifically, the present invention relates to a luminaire with adjustable light sources for enhanced illumination.
BACKGROUND OF THE INVENTION
The subject matter discussed in the background section should not be assumed to be prior art merely as a result of its mention in the background section. Similarly, a problem mentioned in the background section or associated with the subject matter of the background section should not be assumed to have been previously recognized in the prior art. The subject matter in the background section merely represents different approaches, which in and of themselves may also correspond to implementations of the claimed technology.
An electrically powered luminaire, also known as an artificial lighting, consist of a light source, a housing enclosing the light source, and a power source to activate the light source. The light source for indoor lighting is one of an incandescent bulb, Compact Fluorescent Lamps (CFL), halogen lamp, or Light Emitting Diode (LED). Apart from the type of light source utilized, a luminaire could also be classified based on a type of housing utilized for it. Fixtures of luminaires are mounted on ceiling, wall, or table for indoor lighting.
Linear luminaires, such as tube lights or batten fittings, are generally used as indoor lighting systems. An LED batten may be utilized to illuminate space within homes or offices. Fig. 1 illustrates a side view of a luminaire 100 adapted to be wall mounted, in accordance with prior art. The luminaire 100 comprises a light source 102 comprising a plurality of LEDs. Power may be delivered to the plurality of LEDs through an LED driver 104. The light source 102 emits light rays that travel through a diffuser 106 covering the light source 102. The diffuser 106 scatters light

rays evenly in front direction and up to some extent on side directions. Endcaps 108 are fixed at ends of the luminaire 100 to prevent ingress of dust and water.
When the luminaire 100 is mounted on a wall inside a room, light distribution in front of the luminaire 100 is even but regions adjacent to the luminaire 100 are poorly illuminated. Specifically, regions of wall around the endcaps 108 and regions of sidewalls closer to the luminaire 100 are not sufficiently illuminated.
Fig. 2a illustrates light distribution pattern 200 of the luminaire 100 on a floor, in accordance with prior art. It should be noted that the wall on which the luminaire 100 is mounted is present on left side of the floor (towards region 202) whose light distribution pattern 200 is illustrated. Within the light distribution pattern 200, dark colored regions are indicative of having more illumination than light colored regions. The region 202 has an illuminance ranging between 100 to 150 lux, while region 204 has an illuminance ranging from 41 to 57 lux. Fig. 2b illustrates light distribution pattern 210 of the luminaire 100 on a side wall i.e. wall adjacent to the wall on which the luminaire 100 is mounted. It should be noted that the wall on which the luminaire 100 is mounted in present towards region 212. The region 212 has an illuminance ranging between 100 to 120 lux, and region 214 has an illuminance ranging from 40 to 48 lux.
From the light distribution patterns 200 and 210, it is evident that existing lighting systems do not provide sufficient illumination on side walls and floor. Therefore, there is a need to develop a luminaire that could provide better illumination on side walls and floor.
OBJECTS OF THE INVENTION
A general objective of the invention is to provide a luminaire that could provide better illumination of side walls and floor.

Another objective of the invention is to provide a luminaire with adjustable light sources for enhanced illumination.
Another objective of the invention is to provide enhanced or uniform illumination without increasing overall power consumption of a luminaire.
SUMMARY OF THE INVENTION
This summary is provided to introduce aspects related to a luminaire with enhanced illumination, and the aspects are further described below in the detailed description. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.
In one embodiment, a luminaire mountable on a wall is disclosed. The luminaire may comprise a primary light source configured to illuminate regions present around the luminaire. The primary light source may include a plurality of Light Emitting Diodes (LEDs). A diffuser covering the primary light source may regulate distribution of light emitted by the primary light source. Secondary light sources may be provided at ends of the primary light source for providing additional illumination on side walls and a floor. The secondary light sources may be adjustable to provide illumination in required region(s). The primary light source and the secondary light sources may be powered by a common power supply or different power supplies. The primary light source and the secondary light sources utilize a total power ranging from 16-24 watts.
In another aspect, the secondary light sources may include one or more LEDs with beam shaping elements (like optical lens or reflectors). The luminaire may have a linear shape and the secondary light sources may be positioned within end caps of the luminaire. The end caps may be completely made of a transparent material, or a translucent material, and/or partly made of an opaque material. The secondary

light sources may include one or more LEDs with beam shaping elements, such as optical lens and reflectors. Directions of the secondary light sources may be adjustable or tilt-able. With this feature the direction of secondary light source with respect to horizontal plane & vertical plane is adjusted as per the illumination requirement. In preferred implementations, directions of the secondary light sources are adjustable from 5 degrees to 50 degrees, with respect to the horizontal plane and the vertical plane. Usage of the secondary light sources adjusted from 15 degrees to 35 degrees may result in an average increase in illuminance by 9% to 34% on a usable area of sidewalls of a room.
Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings constitute a part of the description and are used to provide a further understanding of the present invention.
Fig. 1 illustrates a side view of a luminaire adapted to be wall mounted, in accordance with prior art.
Fig. 2a illustrates light distribution pattern of the luminaire on a floor, and Fig. 2b illustrates light distribution pattern of the luminaire on a side wall, in accordance with prior art.
Fig. 3 illustrates a side view of a luminaire, in accordance with an embodiment of the present invention.

Fig. 4a illustrates light distribution pattern of the luminaire on a floor, and Fig. 4b illustrates light distribution pattern of the luminaire on a side wall, in accordance with an embodiment of the present invention.
Fig. 5 illustrates a top view of a room having a luminaire positioned on a wall, in accordance with an embodiment of the present invention.
Fig. 6a illustrates a front view of a usable area of a side wall of a room having a luminaire positioned on a wall, in accordance with an embodiment of the present invention.
Fig. 6b illustrates a front view of a usable area of a front wall of a room having a luminaire positioned on a wall, in accordance with an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The detailed description set forth below in connection with the appended drawings is intended as a description of various embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. Each embodiment described in this disclosure is provided merely as an example or illustration of the present invention, and should not necessarily be construed as preferred or advantageous over other embodiments. The detailed description includes specific details for the purpose of providing a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The present invention pertains to a luminaire with enhanced illumination. Fig. 3 illustrates a side view of a luminaire 300, in accordance with an embodiment of the present invention. The luminaire 300 comprises a primary light source 302 configured to illuminate a region present around the luminaire 300. Specifically, a

floor present ahead of a wall on which the luminaire 300 is mounted and side walls are illuminated by the luminaire 300. The primary light source 302 may include a plurality of Light Emitting Diodes (LEDs). Secondary light sources 304 may be provided at both ends of the primary light source 302 for providing additional illumination on side walls and floor. As illustrated, the secondary light sources 304 may be positioned within endcaps 306 of the luminaire 300. The endcaps 306 may be made of a transparent material or a translucent material. The secondary light sources 304 may include one or more LEDs surrounded by reflectors 308 for regulating beam width of light emitted by the secondary light sources 304.
Power may be delivered to the primary light source 302 and the secondary light sources 304 by an LED driver 310. Although a single LED driver is shown, it must be understood that each of the primary light source 302 and the secondary light sources 304 may be connected to a different LED driver. To deliver power to the primary light source 302 and the secondary light sources 304, the LED driver 310 may be connected to and derive power from a common power supply. In one implementation, the common power supply may deliver a total power of 22 watts for operating the primary light source 302 and the secondary light sources 304. For example, when the primary light source 302 utilizes 18 watt power, each of the secondary light sources 304 may utilize 2 watt power i.e. a total of 4 watt power. Similarly, when the primary light source 302 utilizes 17.5 watt power, each of the secondary light sources 304 may utilize 2.25 watt power i.e. a total of 4.5 watt power. In different implementations, the primary light source 302 and the secondary light sources 304 may utilize a total power ranging from 16-24 watts.
A diffuser 312 may cover the primary light source 302 and regulate distribution of light emitted by the primary light source 302. The diffuser 312 may be made of acrylic, polycarbonate material, or other similar material. The diffuser 312 has good light transmission, excellent diffusion of LED hot spots, and offers impact resistance along with good heat resistance.

In an embodiment, the secondary light sources 304 may be adjustable i.e. orientation of the secondary light sources 304 in vertical and/or horizontal plane could be adjusted. Within Fig. 3, 'N' denotes a normal to a wall on which the luminaire 300 is mounted, T denotes a direction of transmission of light by the secondary light sources 304. An angle of tilt (8) of the secondary light sources 304 is defined between the normal (N) and the direction of transmission of light (1). Similar or different angles of tilt (8) may be set for each light source of the secondary light sources 304.
In preferred implementations, the angle of tilt (8) of the secondary light sources 304 may range from 5 degrees to 50 degrees with respect to vertical plane. Additionally or alternatively, the secondary light sources 304 may be placed at an angle with respect to a horizontal plane i.e. the floor. For example, the secondary light sources 304 may be adjustable from 5 degrees to 50 degrees about the horizontal plane. In one implementation, the secondary light sources 304 adjusted from 15 degrees to 35 degrees in vertical plane and/or horizontal plane may result in an average increase in illuminance by 9% to 34% on a usable area of sidewalls of a room, as described in test data provided below.
Fig. 4a illustrates light distribution pattern 400 of the luminaire 300 in a horizontal plane i.e. on a floor. It should be noted that the wall on which the luminaire 300 is mounted is present on left side of the floor (towards region 402) whose light distribution pattern 400 is illustrated. Within the light distribution pattern 400, dark colored regions are indicative of having more illumination compared to light colored regions. The region 402 has an illuminance ranging between 109 to 126 lux, while region 404 has an illuminance ranging between 60-75 lux. Therefore, by comparing the light distribution pattern 200 and the light distribution pattern 400, it could be observed that the luminaire 300 provides enhanced illumination on a floor.

Fig. 4b illustrates light distribution pattern 410 of the luminaire 300 on a side wall. Region 412 has an illuminance ranging between 106 to 115 lux, while region 414 has an illuminance ranging between 58-74 lux. Therefore, by comparing the light distribution pattern 210 and the light distribution pattern 410, it could be observed that the luminaire 300 provides enhanced illumination on side walls.
According to an exemplary implementation, a luminaire may be mounted on a wall in a room. Referring to Fig. 5, a top view of a room 500 is illustrated. The room 500 has a length L and a breadth B. A luminaire 300 is mounted on a wall to illuminate a floor 504, a front wall 506 opposite to mounting wall, left sidewall 508, and right sidewall 510. The luminaire 300 may have a length of 4 feet and may be mounted at a height of 7 feet from floor of the room 500. The luminaire 300 may be present at a distance of X feet from the left sidewall 508 and the right sidewall 510. For example, if the length L of the room 500 is 10 feet and the luminaire 300 has a length of 4 feet, the luminaire 300 would be present at a distance of 3 feet from each side wall. Similarly, if the length L of the room 500 is 14 feet and the luminaire 300 has a length of 4 feet, the luminaire 300 would be present at a distance of 5 feet from each side wall.
In an aspect, each of the secondary light sources 304 of the luminaire 300 may be placed at an angle in range of 15 degrees to 35 degrees, in horizontal plane and vertical plane, to provide enhanced luminance on the floor 504 and usable areas of the side walls 508 and 510. Fig. 6a illustrates a front view of a usable area 602 of a side wall, for example the side wall 508. The side wall 508 includes a top edge 604, a bottom edge 606, a right edge 608, and a left edge 610. The left edge 610 is present toward the luminaire 300 and the right edge 608 is present away from the luminaire 300. As shown in Fig. 6a, the usable area 602 is present 2 feet away from the top edge 604, the bottom edge 606, and the left edge 610. A table provided below mentions the different values of illuminance in the usable area 602 of the side wall 508, recorded in different implementations.

Room
Size(L
xB) Distance between sidewalls
and endcaps
of luminaire Angle
towards
side
walls
(deg) Power
of
primary
light
source
(W) Power of
each
secondary
light source
(W) H'min
(lx) H'max
(lx) J^avg
(lx) % increase
in Eavg
10x12 3 0 22 0 39.1 114 64.5
10x12 3 15 18 2 45.9 113 70.2 9%
12x12 4 0 22 0 39.7 88.5 59.4
12x12 4 20 17.5 2.25 46.3 88.1 66.5 12%
14x12 5 0 22 0 37.1 67.1 52.2
14x12 5 25 17 2.5 41.7 77.8 61 17%
16x12 6 0 22 0 33.3 54.9 45.2
16x12 6 30 16.5 2.75 35.1 77.1 55.7 23%
18x12 7 0 22 0 31.9 45.6 39.5
18x12 7 35 16 3 32 79.6 52.8 34%
In the above provided table, values provided in unbold/normal text indicate readings obtained for a conventional luminaire i.e. luminaire 100, and values provided in bold text indicate readings obtained for the proposed luminaire i.e. luminaire 300. From first row of the above provided table, it could be observed that when the room 500 has a dimension of 10 feet x 12 feet, distance of the conventional luminaire 100 from each of the sidewalls 508 and 510 is 3 feet, and the conventional luminaire 100 is powered using 22 watt power, a minimum illuminance (Emin) of 39.1 lux is recorded, a maximum illuminance (Emax) of 114 lux is recorded, and an average illuminance (Eavg) of 64.5 lux is recorded on the side wall. On the contrary, for the room 500 having similar dimensions, similar distance of the luminaire 300 from each of the sidewalls 508 and 510, angle of the secondary light sources 304 towards the side walls 508 and 510 being kept as 15 degrees, and the luminaire 300 utilizing a total power of 22 watt (18 watt power for the primary light source 302 and 2 watt power for each of the secondary light sources 304), a minimum illuminance (Emin) of 45.9 lux is recorded, a maximum illuminance (Emax) of 113 lux is recorded, and an average illuminance (Eavg) of 70.2 lux is recorded. Therefore, average illuminance (Eavg) is observed to have increased by 9%. Similarly, from

other values provided in the above table, it could be seen that an increase in the average illuminance (Eavg) of upto 34% is observed in rooms of different dimensions by supplying different amount of power to the primary light source 302 and the secondary light sources 304, keeping the total power fixed to 22 watt.
The above provided table could be simplified to illustrate the relation between distance of the luminaire 300 from the side walls 508 and 510, angle of the secondary light sources 304 towards the side walls 508 and 510, and power supplied to the secondary light sources 304 with increase in average illuminance (Eavg) on the side walls 508 and 510.

Distance between
sidewalls and
endcaps of
luminaire Angle towards side walls (deg) Power of each
secondary light
source (W) % increase in Eavg
3 15 2 9
4 20 2.25 12
5 25 2.5 17
6 30 2.75 23
7 35 3 34
In another aspect, improvement of illuminance of the floor by varying the angle of the secondary light sources 304 of the luminaire 300 towards the floor is illustrated through values provided in the below table.

Room
Size (L
xB) Angle
with side
walls
(deg) Angle
with floor
(deg) Power of Power of primary each of light secondary source light (W) sources (W) H'min
(lx) H'max
(lx) J^avg
(lx) % increase
in Eavg
10X12 0 0 22 0 48.6 146 87.9
10X12 0 30 18 2 50.7 134 93.7 7%

12X12 0 0 22 0 42.2 140 78.6
12X12 0 30 17.5 2.25 42.8 126 82.4 5%
In the above provided table, values provided in unbold/normal text indicate readings obtained for a conventional luminaire i.e. luminaire 100, and values provided in bold text indicate readings obtained for the proposed luminaire i.e. luminaire 300. From first row of the above provided table, it could be observed that when the room 500 has a dimension of 10 feet x 12 feet, and the conventional luminaire 100 is powered using 22 watt power, a minimum illuminance (Emin) of 48.6 lux is recorded, a maximum illuminance (Emax) of 146 lux is recorded, and an average illuminance (Eavg) of 87.9 lux is recorded. On the contrary, for the room 500 having similar dimensions, angle of the secondary light sources 304 towards the floor 504 being kept as 30 degrees, and the luminaire 300 utilizing a total power of 22 watt (18 watt power for the primary light source 302 and 2 watt power for each of the secondary light sources 304), a minimum illuminance (Emin) of 50.7 lux is recorded, a maximum illuminance (Emax) of 134 lux is recorded, and an average illuminance (Eavg) of 93.7 lux is recorded. Therefore, average illuminance (Eavg) is observed to have increased by 7%.
Fig. 6b illustrates a front view of a usable area 620 of the front wall 506. The front wall 506 includes a top edge 622, a bottom edge 624, a right edge 626, and a left edge 628. As shown in Fig. 6b, the usable area 620 is present 2 feet away from the top edge 622 and the bottom edge 624. A table provided below mentions the different values of illuminance in the usable area 620 of the front wall 506, recorded in different implementations.

Room Angle Angle Power of Power of H'min H'max J^avg % increase
Size (L with side with floor primary each of (lx) (lx) (lx) in Eavg
xB) walls
(deg) (deg) light source
(W) secondary
light sources (W)

10X12 0 0 22 0 51.5 73.7 64
10X12 0 15 18 2 59.3 114 86.2 35%
12X12 0 0 22 0 46.3 67.6 58.2
12X12 0 15 17.5 2.25 49.1 111 77.3 33%
In the above provided table, values provided in unbold/normal text indicate readings obtained for a conventional luminaire i.e. luminaire 100, and values provided in bold text indicate readings obtained for the proposed luminaire i.e. luminaire 300. From first row of the above provided table, it could be observed that when the room 500 has a dimension of 10 feet x 12 feet, and the conventional luminaire 100 is powered using 22 watt power, a minimum illuminance (Emin) of 51.5 lux is recorded, a maximum illuminance (Emax) of 73.7 lux is recorded, and an average illuminance (Eavg) of 64 lux is recorded. On the contrary, for the room 500 having similar dimensions, angle of the secondary light sources 304 towards the front wall being kept as 15 degrees, and the luminaire 300 utilizing a total power of 22 watt (18 watt power for the primary light source 302 and 2 watt power for each of the secondary light sources 304), a minimum illuminance (Emin) of 59.3 lux is recorded, a maximum illuminance (Emax) of 114 lux is recorded, and an average illuminance (Eavg) of 86.2 lux is recorded. Therefore, average illuminance (Eavg) is observed to have increased by 35%.
From the above provided test values, it is evident that usage of secondary light sources in a luminaire and tilting these secondary light sources at specific angles result in significant improvement in illuminance. Further, the embodiments described in this document utilize a luminaire having a linear shape for the ease of explanation, it must be understood that luminaires having other shapes, such as circular, oval, or non-linear shapes could also be integrated with the secondary light sources in a similar manner for achieving improvement in illuminance.
Although implementations of luminaire have been described in language specific to structural features and/or methods, it is to be understood that the appended claims

are not necessarily limited to the specific features or methods described. Rather, the specific features and implementations are disclosed as examples of luminaire.

We claim:
1. A luminaire (300) mountable on a wall, comprising:
a primary light source (302) configured to illuminate regions present around the luminaire (300);
a diffuser (312) covering the primary light source (302) and regulating distribution of light emitted by the primary light source (302); and
secondary light sources (304) provided at ends of the primary light source (302) for providing additional illumination on side walls and a floor, wherein directions of the secondary light sources (304) are adjustable.
2. The luminaire (300) as claimed in claim 1, wherein the primary light source (302) includes a plurality of Light Emitting Diodes (LEDs).
3. The luminaire (300) as claimed in claim 1, wherein the luminaire (300) has a linear shape, and the secondary light sources (304) are positioned within endcaps (306) of the luminaire.
4. The luminaire (300) as claimed in claim 3, wherein the endcaps (306) are completely made of a transparent material, or a translucent material, and/or partly made of an opaque material.
5. The luminaire (300) as claimed in claim 1, wherein the secondary light sources (304) includes one or more LEDs with beam shaping elements, and wherein the beam shaping elements include optical lens and reflectors (308).
6. The luminaire (300) as claimed in claim 1, wherein directions of the secondary light sources (304) are adjustable from 5 degrees to 50 degrees with respect to horizontal plane and vertical plane.
7. The luminaire (300) as claimed in claim 1, wherein usage of the secondary light sources (304) adjusted from 15 degrees to 35 degrees results in an average

increase in illuminance by 9% to 34% on a usable area (602) of sidewalls (508, 510) of a room.
8. The luminaire (300) as claimed in claim 1, wherein the primary light source (302) and the secondary light sources (304) are powered by a common power supply (310) or different power supplies.
9. The luminaire (300) as claimed in claim 8, wherein the primary light source (302) and the secondary light sources (304) utilize a total power ranging from 16-24 watts.