ANNEXUREI
COMPLETE SPECIFICATION
TITLE:
LEDmaX - Petromax-nke portable high illumination lamp outfit with solid state Light Emitting Diodes (LEDs) as light sources.
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1) PRODUCT NAME:
LEDmax - Petromax-like portable high illumination lamp outfit with solid state Light Emitting Diodes (LEDs) as light sources.
2) OWNER OF PRODUCT AND ADDRESS:
Owner:
MIC Electronics Limited A Public Limited Company
Address:
A - 4/11, Electronic Complex, Kushaiguda, Hyderabad - 500 062 INDIA.

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3) BACKGROUND AND OBJECTS OF THE INVENTION:
Field of research:
LED Light sources in Petromax profile
The development of the LEDmax is triggered by a nostalgic need to recast the century- old invention of the Petromax light (by Graetz Max in 1910) by a present-day technology utility product. The Petromax lights are used widely in processions and functions where lights with more illumination and mobility are required. These lamps use kerosene as fuel which, not only is a potential fire hazard but also causes environmental pollution. The emergence of Light Emitting Diodes (LEDs) as highly efficient and reliable sources of illumination has led to this novel lighting solution for the replacement of the conventional Petromax light in the form of what is named as 'LEDmax'.
LEDmax is the first lighting product of its kind with Solid State Lighting (SSL) technology employing LEDs.
The LEDmax is designed to produce a light output of around 1400-1600 Lumens (which is more than that of a conventional petromax light which is around 1000 -1300 lumens) with a battery backup to last 4 hours once it is fully charged.


4) PRIOR ART AND SHORTCOMINGS OBSERVED:
Conventional Petromax lights are still being used world over for high illumination portable applications. The associated problems are:
Kerosene is not environment friendly, hazardous and causes environment pollution with flue gases
Pressurised mantle - alcohol needed to lit
Frequent replacement of mantle required
Operational discomfort
Maintenance called for from time to time
LPG lights have made an entry as an alternate solution, but the solution is not found feasible since LPG refill cylinders are not readily available in all places.
LEDmax is a technology-alternative proposed to overcome these limitations and to realise a portable, efficient and high intensity light output device with long life to meet the needs traditionally being met by Petromax lights.


S) SUMMARY OF THE INVENTION :
A portable LED based light with a proposed product name 'LEDmax' is developed with a white LED assembly as the light source. It consists of a charging circuit which converts grid supply (230VAC) into DC and charges the Battery. An efficient driver circuit energises a string of white LEDs maintaining the LED junction temperatures within limits ensuring a long life of more than 50,000 hours.
At the same time, the electronics ensures charge control and charge status indication.
Alternately the LEDmax can be charged by a solar panel also.
The specially designed thermal architecture enables the entire heat dissipated by the F'ower LEDs and the electronics to be transferred to the external atmosphere. This special design also ensures no danger to the person who holds the LEDmax.
The specially built holographic diffuser with more than 90% efficiency eliminates the glare and provides uniform illumination,
LEDs offer several operational advantages:
1. Consistence in the Light output
2. High Brightness (Lumens / Watt)
3. Long Life - more than 50,000 hrs
4. Virtually No Maintenance
5. No replacements
6. Eco-friendly - No Pollution
7. No fire Hazards
8. Shock and Vibration proof
9. Suitable for Portable applications


6) LIST OF DIAGRAMS:
The diagrammatic representations of tlie LEDmax are included as under; Fig. 1 Block Schematic Diagram Fig. 2 LEDmax Product View Fig. 3. LEDmax Exploded View Fig. 4. PCB Assembly and Heat Sink
7) BRIEF DESCRIPTION OF THE BLOCK DIAGRAM:
The functioning of the system is explained with reference to the block diagram in Fig 1.
AC-DC power supply cum charger (1) converts the grid supply 230VAC into DC and charges the Re-chargeable Battery (2) exercising all precautions to ensure long life of the battery.
Battery provides power to drive the Light source i.e. LED String (6) through a high efficiency constant current switching mode regulator (5). The Switching mode regulator is controlled by an on off switch (4), which enables the light system to be switched on or off. The constant current driving is essential to generate uniform light intensity from the LED assembly throughout the operating range of the Battery. This method allows uniform current drive to all LEDs irrespective of forward voltage variations.
A Battery monitoring circuit (3) is also included in the electronics to protect the battery from deep discharge.
The status of charging is indicated by the green LED (7). When the battery is getting discharged and its level is about 25% of full charge, the monitoring circuitry will switch off the Light unit and indicates "Battery Low" by flashing a Red LED (8).
The fuse blows off whenever there is a circuit malfunctioning (short circuit).

8) CONSTRUCTION:
The LEDmax product in its completeness is shown with its Front view in Fig 2; the exploded view of the LEDmax assembly is shown in Fig 3.
The base unit (31) accommodates the battery, the on / off switch (32) and the fuse holder (33).
Above the base unit sits the diffuser holder base (34). The diffuser holder has outer (34a) and inner (34b) circular frames within which the diffuser (36) slides in.
The PCB structure (36) stands vertically in the centre with four PCBs containing LEDs (36a) mounted in a vertical fashion facing four sides at right angles. On the top of the diffuser frame ring, sits the heat sink (37) with a mesh (38) above, which transfers the heat readily into the environment. PCB and the heat sink are shown separately in Fig 4.
The mesh acts as a protective cover avoiding accidental touching of the heat sink so that it does not harm the person holding the LEDmax with the handle (39).
Though the above description relates to one embodiment of the present invention, it does not however limit the scope of the invention; higher capacity embodiments and enhanced features can easily be realised with skill in the art. Facilities like battery level indication, mobile charging, multi-step dimming to prolong the light up time, an FM radio etc. are a few.

9) CLAIMS:
We claim:
1. An LEDmax Light that includes:
1. A housing
2. A LED Light source
3. A control electronics
4. An optical diffuser system
5. Appropriate Controllers and indicators
6. A rechargeable sealed maintenance free battery
7. A charge level indicator for the battery
8. An on / off switch and
9. A fuse inside a fuse holder
2. The LEDmax Light in claim 1 wherein the housing is similar to traditional
petromax lamps used in the Indian households.
3. The LEDmax Light in claim 1 wherein the LED Light source comprises suitable
arrangement of LEDs for desired brightness and uniform illumination with an
expected life of more than 50,000 hours.
4. The LEDmax Light in claim 1 wherein the rechargeable power source is a
battery or a capacitor or any similar power storage device.
5. The LEDmax Light in claim 1 wherein the control electronics is responsible for
limiting the charge and discharge levels of the rechargeable power source; for
driving the light source with permissible levels of current for safe operation using
high efficiency switching mode techniques and improved methods of connecting
LEDs; for controlling the illumination levels of the LEDmax Light as desired and
for optimizing the utilization of the battery.
6. The LEDmax Light in claim 1 wherein the optical diffuser system minimises the
glare and produces uniform light dispersal.
7. The LEDmax Light in claim 1 wherein the controllers regulate the usage of the
LEDmax Light; the indicators display the health status of the rechargeable
power source; and a fuse protects the Light from accidental short circuits.


8. The LEDmax Light in claim 1 wherein the power source can be charged from the
grid or a solar panel.
9. The LEDmax Light in claim 1 wherein the on / off switch not only enables the
Light to be switched ON / OFF as desired but also facilitates gradual dimming of
the light intensity in several steps to cater to a variety of other lighting / radio /
mobile charging needs while extending the autonomy / battery backup.
10. The LEDmax Light in claim 1 wherein the unit is portable and hazard free to be
carried to places in processions or for use by nomadic groups in traversing long
distance passages.