Lux and Infrared power are not the same. Lux is a photometric unit that measures point to point illumination (dependent on the quantity of irradiated light and the distance between the light source and the illuminated object) while Infrared power is a radiometric unit - measured in Watts . Illumination makes it possible for us to see while infrared irradiation is invisible to the human eye.

The distinction amongst illumination and infrared irradiation is in the frequencies, or the wavelength. The wavelength of the visible spectrum ranges from 400nm (violet) to 700nm (red) which is divided into a rainbow of colors from red to orange to yellow to green to blue and to violet.

CIE (Commission International de l’Eclairage) also known as International Commission of Illumination, has clearly stated the measurement of light, known as photometry, applies only to the visible portion of the optical spectrum and includes units such as nit, lumen, candela and lux. Measurements of human’s eye sensing ability have shown that the efficiency is highest to green color (100% at around 555 nm) and it declines to 50% near orange (around 610 nm) and blue (around 510 nm) and less than 10% near red ( around 650 nm) and violet ( around 470 nm). Humans do not sense radiated waves in the ultraviolet (below 400 nm) or the infrared (above 700 nm) regions.

CIE standards are quite complex but it will be sufficient to comprehend that the value for a green light source(555nm) with 1W of luminous flux, is equal to 683 lumen, which for a point to point measurement equals 683 Candela . In contrast, 1W of red (650 nm) luminous flux equals only 68 candela and 68 lumen and 1W of infrared (over 700 nm) radiant flux equals 0 lumen, 0 candela and 0 lux.

The problem is that few people know what lux and infrared radiation are, or how illumination and radiation are measured. One of the devices for measuring illumination in lux is the illumination meter, also known as a light meter. The light meter includes a filter and is calibrated to measure only light units within the visual optical spectrum as defined by CIE. This filter is similar to the IR cut filter preventing all infrared radiation from passing in order to keep the measuring accurate. That is why all the known exposure meters, light meters and other illumination measuring equipment will read 0 lux or some residual value when exposed to infrared radiation.

In CCTV light meters are used to measure the scene illumination observed by a security camera, but should never be used to measure infrared irradiation, because its reading will be 0 lux, or a residual reading like 0.001 lux, even though the scene may be exposed to considerable quantity of IR radiation.

In order to understand very well the significant impact that these measurements have in designing a CCTV system we must first understand how a CCD (Charged Coupled Device) works.

The CCD sensor is designed to resemble the human eye, with similar color sensing efficiency. That is why CCD sensors are most sensitive to the green (550nm) region of the spectrum and drop to 0 sensitivity in the ultraviolet (under 400nm) region. CCD sensors however do sense infrared radiation over 700nm and up to 1000nm (some are more sensitive and can sense up to 1200nm).

The CCD sensitivity is much lower in the IR region and drops to only 5-10% efficiency or less, as shown in a typical CCD efficiency graph.

Even though the sensor’s sensing efficiency in the IR region is very low, at day time infrared radiation which is heavily radiated by the sun, by hot objects, by human body and by incandescent or halogen light bulbs must be prevented from reaching the color CCD. If such IR is radiated into the optical path of a color CCD, it will cause heavy disturbances in the processing of color pictures. That is why every color CCD (or CMOS) sensor must be fitted with an IR cut filter that blocks the infrared radiation from reaching it. As explained above, sensors are far less sensitive to infrared radiation than to visual spectrum. Therefore the concept that the removal of the IR cut filter increases the camera sensitivity a hundred or even a thousand times is a simple case of distortion, induced by the improper use of a light meter for measuring infrared irradiation.

The common inaccurate test for the night mode of a day night camera is performed by introducing a powerful infrared radiator (incorrectly named IR illuminator) for irradiating infrared onto a dark scene. The test is carried out by connecting a CCTV camera (with its IR cut filter removed) to a waveform analyzer for measuring the output signal. The day/night camera is placed to observe an IR irradiated scene. After that the light meter is positioned into the scene to measure the infrared irradiation in lux.

This is a misleading test that generates false results. We will get an IR induced B/W signal into the waveform analyzer with a value like 20 IRE, while the light meters will read 0 lux or a residual value, such as 0.01~0.0001 lux, which is used in the camera’s technical chart to define sensitivity or its minimum illumination. You should be aware that IRE is a unit of signal level or strength and is not associated to infrared radiation in any way.

The correct but more difficult lab test of a CCTV camera’s sensitivity or minimum illumination is performed by placing a standard 2000 lux source with a test chart in front of the camera (connected to a waveform analyzer) with its IR cut filter removed. After the initial are inserted in front of the light source until the video signal measured drops to 20 IRE. The minimum illumination will than be calculated on a basis of the neutral density filter reduction factor. Neutral density filters are available in different transmittance factors and reduce the luminous intensity by ratios such as , 1/16, 1/50, 1/100 etc. The neutral density filters are very similar to those used in auto iris smart lenses.

This is why whenever you see a day/night camera with a minimum illumination values like 0.001 lux or even 0.001 lux, try to keep in mind one thing marketing strategies sometimes weight more than common sense.

Being one of the legendaries of Italian footwear industry, Prada sneakers are undoubtedly flashing our eyes with their quality and fashion leading design. Like me, if you are one of these saying ‘I am different and I like wearing nifty things’ then there is no further to say. There is no much to say as the brand Prada sneakers really deserves every single word we speak here.

I had some doubts about the rumours lingering around but when I saw the idiom ‘even the devil wears Prada’, I was no more in any kind of suspicion. What’s more, there are some saying that Papa wears it too =). Above are my reasons for these beauties and the urge to speak on behalf of them here.

However, most of you guys may murmur about one more brand called “Gucci men shoes”, which indeed can not be compared to Prada in all situations as these brands focus on different style of products. But as for me, I prefer Prada shoes type shoes to gucci men shoes. They look more futuristic, stylish and fashionable, whereas Gucci follows the same pattern year and year, repeating itself at all.

Well, these are my own thoughts and I do not claim them to be undeniable facts, you can share your own views. What do you think?

The brand did not confine itself to jewelry pieces only. Like Cartier, Bvlgari also created and launched Bvlgari-Bvlgari watch in1977. This design is considered a classic and best selling design to this day. In 1980s the Bvlgari time was founded in Switzerland, to acquire the best of the best watch maker craftsmen. This brand, took the road to business expansion by signing an agreement with Gerard Perregaux, a Swiss watchmaker company, to manufacture movements for Bvlgari watches.

Bvlgari watches are marked by their classic designs. They have an added benefit of color incorporated into the design in a very subtle balanced manner. Linearity and symmetry are the eye catching characteristics that lend an architectural beauty to them. Each piece carries absolute quality that can be produced only by special attention to detail. Every piece is made with the objective of surpassing the previous ones thus produced.
The Bvlgari watches have combined creativity and seductive femininity very imaginatively in their Lucea Watch. It has a 15mm square case and comes in five different variations. It has bracelet that is made of interlaced minute geometric shapes. Such a wrist watch on a seductive ladys wrist is an ultimate departure from the concept of geometrical shapes attributed to masculinity. For those who are facing difficulty sailing through the global market decline, the price saga is encountered by the replica watches Bvlgari in an artistic way. These replica watches offer an opportunity to save a fortune while gaining a fine piece of art. The user of replica is advised to avoid diving and swimming wearing the watch, because the replica is not as waterproof as its original.

Registry Mechanic is much uncomplicated when it comes to understanding the orders. Three alternative popup on the screen when opening this program. The first option is scan windows registry; the next is compact registry and thirdly is to optimize the system.
You have a choice to do a speedy scanning or a full scanning whichever is convenient for the user. When the scanning route has completed its search, the errors are partitioned into groups according to the ranking of the danger level and displayed on the screen. Then the user can make a decision which entries to erase and which entries to leave be.

Registry Mechanic has a feature that most registry cleaners do not and that is self-motivated system optimization put into action which is applied directly into the Windows Registry planned to pick up system performance. This tool also presents a start menu article cataloging and nonstop viewing of the system. Most registry cleaners have a list of tools that are not even essential to have where Registry Mechanic has a little number of options but are helpful tools in helping clean up the windows registry and remain the system navigating along smoothly.

Registry Mechanic has a enormous user friendly online support where you can get answers you are looking for to keep the performance of the computer up to balance and will have the reply you are looking for within a twenty four hour period. Many software review such as Registry Mechanic reviews, rank this program at the top of the line for service and hold up of their artifact.

When it comes to different brands of designer invitation cards how can one forget about Paper So Pretty invitation and card collections. The vibrant colors with attractive layout of their huge collections will really make your guests feel welcome. If you want to invite your friends in a Cocktail Party then make this event more memorable by adding a personal touch. You can decorate your place in a very stylish way so that your guests become impressed.

Hosting a formal party has several steps. First you have to make a list of your guests and then you will have to invite them individually. If you want to invite your friends and relatives in a formal dinner party then you should send them a proper invitation card. If it is a black tie party then you must specify the party dress code above the card. It will be very helpful for them. They will feel much honored if you send them a beautiful, elegant Formal Invitations card.

For some a simple 2 GB of information download per month will suffice. These people will do fine with a pay as you go mobile broadband plan. For others unlimited download time is the only alternative. And as previously mentioned if you are the traveling business person sort, you had better check into the mobile broadband coverage for the company you intend to sign with. Many mobile broadband providers in United Kingdom do not have full coverage in the outlying areas. All of these features and factors can be easily weighed in the balance with assistance from Broadband Choices. For years United Kingdom residents have relied upon Broadband Choices and their web site at broadbandchoices.co.uk for help with choosing the best means of Internet connection. Now that same expertise is available free of charge for anyone trying to find the best deals on mobile broadband.

One way of choosing a computer repair services, from the list that you may have, is by making enquiries with friends or business associates about their services. If any one of them strongly recommends a specific company as having superior technical skills, and capable of finishing the job fast, then it can be the first choice.

So far as such recommendations are not available, and you are left to your own devices for choosing a reliable computer repair help, the first thing to check is the level of the technical know-how of their staff. You might have to find this out directly and indirectly. The sites of most computer repair services will give the list of clients to whom they have provided their services. Checking with them will help in assessing the level of expertise of the technicians.

Another thing to check is whether they will provide onsite services, if the type of problem necessitates that. Some computer repair services restrict their activities to online help, especially if the client is situated far away. This may not cause any difficulty, so far as the computer problem lends itself to being repaired online. But some problems might need a technician to inspect the machine in person. So it is important to know whether they are ready to come in person or whether they expect the user to bring the machine over to their service center.

Spare parts availability is also a selection criterion that can be used to assess a given computer repair services. For machines, which are past their warranty period, the user could sometimes need part replacement. If these are not readily available with the service providers, it will entail unnecessary waste of time. If they are not able to provide the spare part immediately, the computer repair services should at least be able to provide the user with a stand-in computer till such time that the original one is replaced.

Even where the company has got spare parts, their billing methods could vary. This is another point to consider while selecting computer repair help. Some service centers enter into service contracts with their clients where they will provide certain spare parts at no additional costs. The cost effectiveness of this provision will have to be decided based on different things like the charges of the contract, and the warranty terms of the computer that is likely to need services.

A majority of computer users are looking for free software applications for an effective virus removal. Phrases like Virus Removal , fix virus errors are searched for over 100 times a day. But what people actually fail to understand is that these programs can make your system a box having nothing into it.

Generally, educated people look forward to the Internet when they want to search for anything like free virus removal applications; it has become easier for virus makers to create these programs which they can distribute over the web to thousands of other web users. This makes you pay hefty amounts just to have used a free software application. It can also lead to the downfall of your operating system. So, what other alternatives do you have if you want to avoid the hassle-free virus removal software?

If you suspect your machine to be virus infected, you can try online virus removal which is in huge demand with computer users. These vendors who offer you online computer support will have guaranteed legitimacy and will be able to effectively find and eliminate virus or spyware infection that is present on your computer.

Choosing free virus removal software applications can be highly risky as most of them all claim to be the best and the solution to this problem involves reading through reviews and testing them. On the other hand, contacting renowned online computer support resources can cost you nothing as you see your work being done before your eyes. Moreover, you get human to assist you with your computer problems than a software application. They can detect many types of infections on your operating system after which it will quarantine and repair them instantly.

Google Android

It is not surprising that Google Android tops the list of operating systems for e-readers. The Barnes and Noble ‘Nook’ was the first e-reader to use Google Android. Since that launch, Google Android has been used in various e-readers and that trend is expected to continue into the future.

Google Android gives users access to 1,000,000 free, public-domain books digitized by Google. All devices using the Android system can tap into Android apps and vice versa. In addition, Google understands that the real power of the open source Android lies with the Operating System Defaults. Google eBooks will serve as the default on every Android device.

The innovative eDGe e-reader, created by Entourage Systems, runs Google Android operating system. The eDGge is a netbook/e-reader combination which offers users the convenience of a Google toolbar on the right screen. Running on Wi-Fi and 3G networks, users can surf the internet, watch videos, or engage in video chat with this device.

Spring Design’s ‘Alex’ will also support Android apps. Yet any applications which require internet access will work only with Wi-Fi. With this dual-display e-reader, the 6.5″ e-ink screen for reading sits above a 3.5 color LCD. Users can display images and video, view notes, and even browse the web.

Expected to be released in 2010, the proposed Netronix, a collaboration between Texas Instruments and a Taiwanese networking specialist, is also an Android-based e-reader. Android e-readers allow portability of books (between Android e-readers) as well as access to Android apps.

Linux

The new Skiff reader is a Linux-based system. The Skiff reader is said to be the largest (11.5″) and thinnest (0.25″) with the highest-resolution (UXGA - 1200 x 1600). The Skiff reader is expected to be on sale later in the year. Interested buyers will be able to find it online and at over 1000 Sprint stores in the US.

Sony Reader runs the MontaVista Linux Professional Edition operating system. Sony ebook Library is not supported on Linux. Yet when this device is connected, it grants access to its flash memory and memory card slots (as if they were USB Mass Storage Devices).

Amazon’s Kindle DX runs Linux-2.6.22.19. Operating system updates are received wirelessly and install automatically during a period in sleep mode in which the wireless is in operation. As it was noted in the article “Amazon Offer Kindle for Sale in Europe - Will they Succeed”, the device is being offered globally on the 3G network with no charges for the wireless connectivity that is used to download eBooks (Digital Book Readers). With its Wacom touchscreen, Illiad runs Linux 2.4 kernel.

Due to its open Linux operating system, Illiad can run third-party applications created for it. The Hanlin eReader v3, one of the first Open Source e-readers, is built on the Linux operating system. China’s Hanvon uses Linux 2.6 and Cool-er, Pocketbook, and Bookeen also run Linux.

Windows

Although Windows is slipping in popularity, it will remain a major player in operating system market for many years into the future. Sony PRS-505/SC Digital eBook Reader, with its company software Sony ebook Library, is similar to iTunes and requires Windows. The software will not work on the 64-bit version of Windows XP but does support Windows Vista and Windows 7. Recent announcements point to the use of Windows 7 in new color ’slate’ e-readers such as Archos or HP. The Taiwanese company, MSI, has also created an e-reader/computer combo which runs Windows 7.

E-readers with operational systems, such as the leading Google Android, encourage openness. These innovative devices are ‘cracked’ to allow users to run Android apps as well as download music and access social networks. Yet Fortify Software, the application vulnerability specialist, has issued a warning to corporations about possible security issues with modified e-readers. When a devise is ‘cracked’ or repurposed in this manner, there isn’t any way to check the security of the operating system ‘cracks’ or newly installed programs.

For usage outside the corporate world, however, e-readers have few drawbacks. E-reader companies are always trying to improve on features, performance, and design. E-readers have made a tremendous impact on the reading experience - what we read, where we read, and how we read books and newspapers. More and more people are choosing e-readers and their state-of-the art operating systems are helping to drive that demand.

Posted by : Virus Removal & Computer Repair Service

The reason why people choose laser marking over methods such as doing it by hand or other forms of radiation is:

1. Speed. Laser works fast. By programming a design into a laser machine, that design can be reproduced in a matter of seconds. The same thing, by a human hand, would require a hundred times that duration.

2. Repeatability. Watermarks, logos, barcodes etc are all security information, and producing perfect replicas is of the utmost importance here. Laser replication is as error-free as it gets, with error levels too low for even the most sophisticated machines to detect. Also, repeatability is often desirable even when it is not of such paramount importance - for example, while printing designs on apparel or accessories in bulk.

3. Precision. A laser beam is no more than a few microns thick. A micron is a thousandth of a millimeter - yes, I have my calculations correct. Therefore, there is no better instrument than laser for making fine markings on areas where precision is absolutely necessary. This is why laser is used on things like glassware, medical implements, barcodes, backlit keyboards etc.

Till recently, however, laser instruments have been limited to 2-dimensional surfaces. Even this was not seen as too great as limitation, as the biggest advantage of laser was its speed, precision, repeatability and permanence.

Now, the same precise performance has been diversified to include 3D items, of the most complex shapes and varied sizes. This is where 6-axis laser comes in. 6-axis laser technology combines several features:

? 3D scanning, for one

? Use of robots to move around the workpiece. This allows a more constant path and distance of the laser, where both the head and the material being worked on are moved around to generate optimal results.

? Marking lasers with vision system

? Software tools to allow image wrapping, even around complex and elaborate 3D shapes such as lanterns, vases, gems and so on

Consequently, 6-axis lasers have become highly popular in industries that require high-precision cutting, etching or marking on 3D surfaces.

As most people know by now, markings these days are made by erasure as often as they are made by painting. Backlit keyboards, for example, work by having paint on the entire surface, but a few layers of paint removed to create the symbol on the key. The same holds true for car dashboards etc.

6-axis lasers are being used in the aeronautical industry too, to remove the paint from magnesium castings. Another important use of this sophisticated, state-of-the-art marking technology is to remove metal plating from surfaces to generate beautiful, complex patterns.

For cost-effective, efficient and aesthetically pleasing marking technology, there is no better choice than a laser marking system.