Today
the goal of mining industry is a bit different than it was a few years ago.
Today main focus of the industry is on improving the safety, productivity and
sustainability of the environment. But as the price of commodity falls its
operating cost increases. Then what can be done to improve the prosperity of
the industry along with safety of the mine operators. Though by controlling the
pricing and demand structure of this industry can make some difference in the
situation but to make considerable difference they are thinking about reducing
operation cost. A LED MINING LAMP with
green and efficient technology has increased the possibilities in maximising
the use of heir limited resources.

LED Lighting Technology

LED
or Light Emitting Diodes work at semi-conductor lighting technology which helps
in providing the light with very high brightness. Initially LED lamps emitted
red light with low intensity which was used for lighting typical penal
indicators. Today LED lamps offer infrared and ultraviolet wavelengths with
very high brightness that can be used for various applications including
domestic lighting, car lights, torches and LED
MINING LAMPS.

Benefits of LED mining lamps

LED MINING LAMP MANUFACTURERS claim
to offer many advantages against the incandescent sources of light including longer
lifetime, lower energy consumption, smaller size, improved robustness, greater
reliability and durability. Brief information about these benefits is provided
here under for your consideration.

Long life: The normal working
life of an LED MINING LAMP is
usually about 100,000 hours or about 11.5 years if you use them continuously
during day and night. Usually the bulbs of other lighting systems expire just
after 1,000 hours or less unless it gets any impact. 

Lower consumption of energy:
LED lamps use much less energy as compared to other incandescent bulbs. It
means LED lamps can be allowed to glow continuously in much less power required
to glow other traditional lamps. 

Lower cost: Though LED sources
of light cost higher than other lamps while installing them but their
reliability and long life of reduces costs of their maintenance which makes
them cheaper for the owner.

Solid structure: Normally
the filament of a normal bulb can be broken easily by a sudden jolt or shock as
they are highly fragile object. But LED on the other hand is much stronger than
normal bulb as it is encased in high strength and virtually unbreakable resin
of optical grade. Moreover the absence of any filament or glass also makes LED
lamps perfect to be used in demanding or rugged environments. 

Safety: The LED MINING LAMP SUPPLIERS also present them as the safer source of
light as they produce lesser heat and use low voltage. They are also safe as
they have no hot filament, no glass to break, no noxious fumes and no gas to
emit. Moreover LED mining lamps less
likely to fail at the time when they are needed the most due to their
reliability and built-in toughness. Thus these lamps have raised the level of
security and personal safety users.

Thus
LED MINING LAMPs have a number of
benefits for their users. To know more about the topic, do visit http://en.ofweek.com. 

By the help of following 5 points, you can calculate your LED heat sink.

Define Temperature.
Define LED parameters.
LED heat sink Calculation.
Design Verification.
Essential Remarks.

Now, we will discuss them one by one.

1. Define your expected Temperature:

First of all, define your ambient temperature. Here are the few examples of it.

Spot Light Temperature = 30 Degree.
Ceiling Down lighter = 50-55 Degree.
Automotive lighting around = 45 Degree (Only from design prospective)
TLife around = -40 up to + 85 Degree.



2. Define LED Parameters:

Here are some of the specs of LED parameters.

Take a LED cob module Citizen citilied CLL020 series.
Model # : CLL020-1203A1-303M1A2
Forward current should be around 360 mA.
Forward Voltage should be around 40.9 Vdc.
Power is approximately 14.7 W.
Luminous flux is around 1210 lm.
Maximum Case Temperature would be around Tc 100 Degree.
Maximum Junction Temperature would be around Tj 150 Degree.
Thermal Resistance should be Rj-c 2.6 Degree/W.

LED heat sink for Citizen CLL040-042

3. LED Heat Sink Calculation:

Here, we have to follow some specific formulas. We need to take care of the following items:

Individual Thermal resistance of each part.
The formula used can be = T = Pd * Rth
Here, we can calculate thermal resistance by using formula (Rj-c).
In case of recessed environment, Temperature should be 45 Degree.
The total power to dissipate should be less than total power of LED consumes.
More light the power would be, more efficient your LED module would be.
Maximum Temperature can be calculated as Tj- Ta = 135-45 = 90 Degree.
Pd= 14.7 W*80 % =11.76 W.
Heat sink with Rth value should be less than 4.65 Degree.

4. Design Verification:

Once you are done with the applying thermal pad and the heat sink, you have to verify the design. We have to keep some safety precautions prior design. Maximum Temperature limit should not be more than 100 degree centigrade. But for safety precaution we have to measure the temperature around 87-92 degree centigrade.

5. Essential Remarks:

As far as the Rth value is concerned, some manufacturers give a single thermal resistance for the heat sink. But you should be well aware of Rth of the same heat sink.

Resource Box

For more info of LED Heat Sink, pls check: http://en.ofweek.com/manufacturer/led-heat-sink

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Aimed at lighting control applications, two new energy-saving latching relays featuring the capacity to handle the high inrush currents associated with these application have been introduce by Omron Electronic Components Europe. The G5RL U/K latching relays are also ideal for movement control, smart meter, power line switching and PV inverter applications. Latching relays are only energised while switching and use less power than non-latching designs in most applications, says the company.

Fabrizio Petris, global applications team manager, building automation, Omron, said: “Capacitors used in fluorescent lamps as starters and in parallel to LED drivers lead to particularly high inrush currents in lighting circuits. Omron’s new latching relays are a great switching solution for this and other energy management applications, offering probably the best price performance on the market.”

Both the G5RL-U and the G5RL-K can switch up to 16A and are capable of dealing with inrush currents of up to 150A. Both are offered in SPST-NO form, and are approved to a VDE standard demanding resistance to over 150A inrush. They also carry UL TV-8, a standard that exposes components to 117A inrush currents. The G5RL-U features a single coil whilst the G5RL-K has a double coil architecture. An SPDT version is also available, though its specifications are lower, says the company.

LEDs have been replacing traditional lighting at a rapid pace, offering longer life times, more efficiency, lower cost, etc. OLED lighting promises to complement LED lighting by offering better color performance, power efficiency, unique shapes and designs, as well as a thin, lower weight and elegant profile. To enable OLED technology in this emerging lighting market, there is a need to replace traditional materials with new, better-performing materials such as silver nanowires.

Figure 1. Image of Silver Nanowires at 70° tilt

Silver Nanowires
In an OLED device, the top electrode is made of a transparent conductor and plays an important role in light transmission/efficiency. A transparent conductor made of silver nanowires allows for high conductivity with excellent transmission and acts as the top electrode/anode in the case of an OLED lighting system. Silver nanowires in the top electrode are used in the form of a network of wires (see Figure 1) that are a few nanometers thick and a few micrometers in length. With silver being the best conductor on the planet, the network of overlapping nanowires offers conductivity less than 10 ohms/sq while allowing 94 percent of the light to go through the percolated network.

Figure 2. High transmission of silver nanowires at low resistance (Photo courtesy – ClearOhm silver nanowire material by Cambrios Technologies)

Aesthetic Lighting
OLED lighting is not a point source and, therefore, does not need to be diffused or set at a distance from the area that needs to be lit. OLEDs emit light all through their surface and can be used to create aesthetically pleasing lighting structures of various forms and sizes. Imagine an elegantly shaped lampshade emitting light instead of the shade diffusing the light from the lamp within. Lights in any form factor that needs to be bent, curved or flexed, needs flexible transparent conductors. This can be achieved easily through the use of silver nanowires rather than thick and brittle conductors.

Figure 3. OLED lighting tiles. Photo courtesy – Panasonic

OLED devices can serve a dual purpose of being a window or a light. They can be made transparent – a window that you can see thru during the day and that would emit light at night. The skylights and car sunroof could not only allow ambient light to enter, also could become lamps at night. In such applications, it is important to have very transparent layers of OLED materials, another area where silver nanowire networks play a huge role.

In addition, OLED lighting can offer shades of color previously not possible with conventional lighting. Better color tuning is possible with silver nanowires, and OLED lights can offer a more precise shade of color for premium lighting applications.

2.5D Lighting
OLED lights can be produced on plastic substrates and coated with silver nanowires. These types of flexible and rugged form factors can be deployed on non-flat surfaces, such as the dashboard of a car. This type of 2D and 2.5D lighting systems are very desirable in high-end consumer devices, retail stores and museums where any surface can provide changeable color. The traditional transparent conductor materials like ITO (indium tin oxide) are brittle and don’t lend themselves to bending or shaping, hence newer materials such as silver nanowires, which are malleable and ductile, are preferred.

Thinner, Lightweight, Rugged
Silver nanowires complement OLED in that both materials are thin, lightweight and very rugged. The thin and lightweight features make them suitable for applications such as aircraft lighting and illuminating skyscrapers, and the rugged nature of the system (both OLED and silver nanowires can be coated on plastic or thin glass) makes them suitable for outdoor public venues, which typically require lighting that is not only bright but also unbreakable.

Conclusion
LED and OLED technologies will reshape the lighting market with more efficient devices that require less power and offer flexibility in design at lower overall cost. While LED technology is way ahead in replacing conventional lighting technologies, OLED lights will follow and offer lighting solutions that we have never had before. Silver nanowire technology has begun to enable these emerging applications.

ViewSonic revealed on Wednesday a new 10-point multi-touch 22-inch display with an ergonomic design, the TD2240. The display features an interesting dual-hinge stand that allows it to lay completely flat like a tablet so that multiple users can interact with the contents on the screen. This display is available now in North America for $489.99 USD.

"Today's consumers are increasingly mobile-savvy and demand the same touch experience of their mobile devices on the desktop," said Kenneth Mau, Product Marketing Manager, ViewSonic. "The TD2240 delivers an industry-leading touch experience with its intuitive touch technology and full feature set."

The specs show that the display has a resolution of 1920 x 1080, a typical contrast ratio of 3000:1, 178 degree viewing angles, and a typical response time of 25 ms. As for the I/O aspect, the panel provides a VGA port, HDMI 1.4, DisplayPort, audio in, earphone out, and four USB 3.0 ports, one of which connects to the PC for touch.

ViewSonic's new display is also equipped with a scratch-resistant surface, SuperClear technology for "vivid" colors, and two 2-watt speakers. The HDMI port is also MHL compliant, meaning that a connected MHL-capable device will receive a charge while connected to the screen and displaying content.

"Whether consumers are looking for a rich, intuitive interface or commercial environments requiring seamless integration with Windows systems, this display is equipped to meet the consumer demand for touch technology beyond mobile devices," Mau adds.

To purchase the new display, head here. Looking for something larger? ViewSonic's 10-point touch family includes the 23-inch TD2340 for $619.99, the 27-inch TD2740 for $849.99, and the 32-inch TD3240 for a meaty $3,059.99. ViewSonic also has several dual-point touch displays as well.