When it comes to surface mount style LEDs, the first generation comes in 3528 and 5050 sizes. The 3528 LED has a single 20mA LED chip that is approximately 0.06 watts. The 5050, on the other hand, has three 20 mA LED chips that are approximately 0.2 watts. As such, one 5050 LED package supports a capacity of 3x 3528 LEDs.
The 5050 package not only has a higher capacity, as it has ample space for three different LED chips, it is also a popular way of packaging RGB LEDs that need multiple colors. However, this package can also package single color white LEDs, where three blue LED chips can be used.
There are also some 3528 RGB LEDs, but they only have one color in an LED. This may cause issues to crop up such as color shifts or shadowing because of the uneven spacing. As the RGB LED chips are often found in a single package in a 5050 LED, having a single point source works better.
The second generation of LED Packages come with an increase in power density. The 2835 LED is driven at 60mA each, that is, 0.2 watts. The 5730 LED, on the other hand, is driven at 150mA each (0.5 Watts).
Additionally, the power levels in the LED have also increased considerably following improvements in LED chip technology as well as thermal design improvements in the package. Actually, some of the power levels in these LEDs surpass the overall thermal capacity of the whole LED strip system. This is because the thermal dissipation of an LED strip is constrained due to lack of heat sinking or because of the material.
Likewise, the second generation of 5730 and 2835 LEDs offer a lower profile. If you have limited vertical space but have to fit LED strips in the location, this can work to your advantage. Additionally, the package design cuts on issues with fringe yellowing.
2835 LEDs that operate on 20mA can substitute the former 3528 LEDs. In comparison with 3528, they boast of better stability, lower cost, better consistency, and higher efficacy.
The 2835 60mAs are considerably smaller and thinner than 5050s. They are therefore an efficient replacement for the 5050 LEDs as they produce 20 percent more light while having the same power consumption.
The 5730 LED that runs at 150 mA each (0.5 Watts), produces more light compared to the common 5050 or the 2835 SMD. In fact, the high-quality 5730 chips on 60 LED p/m give out around 2000 lumens.
We compare some parameters of several commonly used SMD LED packages for your reference.