OK, thank you all, I made my choice:
- 4 Seoul P4 3,5W LEDS : Red, Green, Blue and White (it makes 60 + 100 + 20 + 120 = 300 Lumens typ. at 350mA, but those LEDs can support up to 1A current: 108 + 182 + 38 + 240 = 568 Lumens !!!)
- an RGB Seoul P5 (3W) LED (for testings, if it's OK, I 'll buy...