Judging by the type of LED that you have linked to in your first post, which is a RGB LED you are not dealing with 5 LEDs but with 3x5 = 15!
If, on the other hand, you want to control the brightness of these 5 LEDs independently then things get more complicated.
There are quite a few chips available that can control 3 channels at a time but finding one that actually has a good dimming ratio at high current is not that trivial. But, it depends on what you actually want to achieve.
Te LT3496 can control 3 channels with up to 750mA each at a dimming ratio of 1:3000. I have not been able to find anything comparable. But then, that certainly will not result in a low cost solution, as that chip alone is around $7.