LED strips are low voltage (5V, 12V, 24V) lighting devices,

Рубрика: Articles. Автор: admin. Суббота 10 Сен 2011 в 10:30 дп

LED strips are low voltage (5V, 12V, 24V) lighting devices, used typically in architectural lighting, sign letter lighting, concealed lighting, perimeter lighting and many other applications as a replacement for older and less efficient technologies such as incandescent, fluorescent, halogen or neon lighting and they are typically at least twice as bright as other decoration options such as rope lighting fixtures. They are available in single color and RGB versions, the main manufacturers can offer White, Warm White and Red, Green, Blue and Yellow mono color strips, but some of the top manufacturers also offer different versions of White or Warm White adjusting the light output and color temperature. 2. LED Strip Types LED strip light is one of the fastest growing areas of the light emitting diode market. There are several subcategories within this category: a. Rigid Strips: with or without waterproof protection, with PCB board finishing, encased in plastic or with aluminum backside (also known as LED bars) and using high power SMD or older LED technologies such as mounted diodes. b. flexible strip: with or without waterproof protection, with or without adhesive tape on the back and using either SMD mounting technology (several options depending on power) or older mounting technologies (which are less and less common). The biggest share of the category is taken by the strips LED flexible and that is why we will focus on them primarily (since SMD is the main technology and by far the most efficient we will focus on that too). 3. Flexible strip LED Flexible LED Strips consist typically of low profile surface mounted diodes (SMD), which are the same type of chips used in latest fluorescent LED tube T8 but in the case of the strips they are attached to a flexible conductor strip. Power is then applied to one end of the strip and the diodes emit a smooth lineal light. Since the mounting base is flexible, they can be installed in multiple areas and they offer one more advantage vs rigid strips (LED bars), they can be cut to custom size, and reattached or interconnected if needed, either by simple soldering at marked soldering spots or by the use of Fast connectors, which are offered by the main manufacturers. Normally flexible strip LED are manufactured in reels, of typically 3 to 5 meters, and based on the type of chip and design of the reel connections, they can be cut every 2 to 6pcs of chips. The possibilities of design for the strips are limitless, although small companies focus on just a few of them. Main suppliers can offer different PCBs finishing (transparent – Brass circuits or White, and even Black – Originally the PCBs holding the diodes were copper colored. New generation LED strips have white coated PCBs, which give a more uniform light distribution.), also different widths, from 5mm for thinnest strips which are mostly focused on specific lighting functions, such as side view lighting, to 8mm and 12mm, which are by far the most common, and wider strips for more complex strips, such as the intelligent strips which range between 15 to 17mm. Obviously the width of the strip depends also on its casing and therefore, on its waterproof rating. The thinnest versions are IP20 (some top suppliers also offer IP64 which is a very good and recommended alternative to IP20) and the widest are IP68, which consist of a complete silicon casing surrounding the strip. We will analyze in more detail the different main features of the flexible strip LED. 4. SMD 3528 vs SMD 5050 SMD 3528 LED flexible strips are a medium output, low heat LED die. In 5 meter reels with 300 chips they generally generate between 120 to 220lm/m (in Pure White) which is enough to project an even light level approximately 300mm (1′) from where it is mounted. Some manufacturers offer Ultra White versions which can offer up to 360lm/m. The average power consumption for this type of LED flexible strips is 5W/m. However, big manufacturers offer also higher density reels, with 600 chips per 5 meter reel, which deliver up to 440lm/m (in Pure White), which can go even higher to 720lm/m for manufacturers with Ultra White versions. The power consumption in this case is around 10W/m. Most 3528 LED strips can be cut every 3 LED modules, or 50mm (2″) for 300 chip reels and 25mm (1″) for 600 chip reels. SMD3528 is a single color LED Light Stripssolution. SMD 5050 LED flexible strips are a high power, higher heat SMD LED option. They are also commonly referred as triple core strips. Strips using this type of SMD LED flexible strip usually have a wider variety of options, being the most common the normal density reels with 30 chips per meter (360lm/m in Pure White) and a power consumption of around 7,5W/m but some manufacturers offer also higher densities, normally in shorter reels, such as 3 meter, with 60 chips per meter, delivering an astonishing 720lm/m in Pure White with a Power Consumption of around 14,5W/m. As we can see, SMD 5050 can offer a light output over 3 times that of the 3528 strip and therefore the 5050 LED is well suited for lighting up areas that may be subject to high levels of ambient light. 5050 LED Strip can also be used as a replacement for fluorescent tubes in general task lighting and in light boxes. The 5050 strip is available in both single color and RGB color change models. The Color change version requires additional control but can produce millions of different colors, so finding the right shade or combination is a simple matter of programming. 5. IP Protection for LED Strips Which IP protection fits your project best? LED flexible strips are generally offered in two or three versions (depending on how wide is the assortment of the manufacturer): IP20: Without waterproof treatment on top of PCBs, normally fitted with «3M» adhesive tapes on backside, fit for indoor dry areas use only. Many manufacturers that don


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