As LED lighting has become one of the most energy efficient solutions since electric lighting was invented, it’s only natural it is a quickly evolving technology.
So, here, we will explain the technology and keep you updated as it evolves. We will also index the various LED Modules, so that you can quickly compare available products, based on the LED SMD used.
First, it’s good to know that “SMD LED” is an abbreviation for Surface-Mounted-Device Light-Emitting Diode. This way you can sound smart when you talk to your local geek.
An SMD LED Module is a type of LED module that uses Surface-mount technology (SMT) to mount LED chips on printed circuit boards (PCB). It is a self-contained Surface-Mount LED device designed either to function on its own or to plug into a compatible unit.
Index | SMD LED Modules
The various types of SMD LED Modules are distinguished by the dimensions of the LED package.
Currently, the most commonly available SMD LED Module types are the: 3528, 5050 and the 5630. The brightness may vary depending on the input voltage, which of course inversely affects the device lifespan.
(mm x mm)
|3030||3.0 x 3.0||0.09||110-120||120||90||130|
|3020||3.0 x 2.0||0.06||5.4||2.5||120||no||80||90|
|5730||5.7 x 3.0||0.05||45-55||15-18||120||no||90||110|
|5630||5.6 x 3.0||0.05||40-55||18.4||120||no||80||110|
|5050||5.0 x 5.0||0.24||14-18||5.1-5.75||120||no||80||90|
|2835||2.8 x 3.5||0.02||11-12||8.4-9.1||120||yes||100||130|
|3528||3.5 x 2.8||0.08||5.4||3||120||no||80||90|
|3014||3.0 x 1.4||0.01||9-13||2.1-3.5||120||yes||100||130|
|7020||7.0 x 2.0||0.5 / 1||25-35||120||35||140|
|4014||4.0 x 1.4||0.2||23-26||130|
|3535||3.5 x 3.5|
|3258||3.2 x 5.8|
|1206||3.2 x 1.6|
|1104||1.1 x 0.4|
SMD LED modules are widely used, in LED lamps, for backlighting, home illumination, shop-windows, advertising, automobile interior lighting, Christmas lights, and numerous lighting applications.movie I Am Heath Ledger
The Color Rendering Index
Another important factor in understanding lighting, is the color quality it will render. In some cases, it is very important to get the correct colors of objects being displayed. So the tie looks pretty much the same when you leave the store.
Can’t tell the difference between your Navy jacket and Black jacket? There a good chance your current lighting has a low CRI. Basically, different light sources render light differently. Not all light is made equal
In short, a color rendering index (CRI) is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source. Light sources with a high CRI are desirable in color-critical applications such as neonatal care, photography and cinematography.
It is defined by the International Commission on Illumination (CIE) as follows:
Color rendering: Effect of an illuminant on the color appearance of objects by conscious or subconscious comparison with their color appearance under a reference illuminant
The CRI of a light source does not indicate the apparent color of the light source; that information is under the rubric of the correlated color temperature (CCT).
In the pictures at right it can be noticed that the spectra have different structures; the incandescent lamp has a continuous spectrum, whereas the fluorescent lamp has separate lines in the spectrum due to emission of photons of discrete wavelengths by mercury.
LED Strip Lighting
LED strip lighting can be manufactured with a variety of LED chips. The numbers you see such as 3528 and 5050 refer to the size of the chip. The older style strips that have been popular for a few years now are the sizes seen above. Currently, there are even smaller and more efficient LED chips on the market with the sizes of 2835, 3014, 5630, and 3020