The wavelengths that the paddle diodes of the machines can produce have been used to determine the generations of lipo laser and LED machines. Within each generation of lipo lasers, there are undoubtedly other similarities as well, but the wavelength is the key differentiator.

Now let's contrast the various laser lipo machine generations.

First Generation: The wavelength of first-generation laser systems was obviously much higher. They would typically be able to produce waves of 670 nm. Even though those machines weren't as efficient as today's more modern LED/laser lipo machines, they were still a great place to start.
Second Generation: As technology advanced, the equipment began to produce wavelengths as short as 650 nm. We refer to these as second-generation machines. These devices are still widely used in clinics, and people who use them are typically satisfied with the outcomes. These laser systems really are very powerful. In fact, despite the fact that clinics continue to adopt the newer generations, the majority of people continue to use second-generation lipolasers.
Third Generation: This is the generation where the capabilities of LEDs and lipo lasers are at their peak. These devices are amazingly quick and precise at melting fat and tightening skin at a wavelength of 635 nm (which could be slightly off at up to 640 nm). These machines are faster and more efficient than any older generation lipo laser machines due to the relatively high energy at such low wavelengths.