Many thanks! 
Does transistor with these parameters suit for each 2W led?
TIP122 Si-N-Darl+D 100V 5A 65W
Kind Of Product: Transistor
Sort: N-DARL+D
Housing: TO220
Voltage: 100 V
Current: 5 A
Resistance: 1 Ohm
Power: 65 W
Will this one also work?
TIP127 Si-P-Darl+D 100V 3A
Type: p-darl+d
Voltage: 100V
Current: 3A
The LEDs that I am using are THESE