So from advice in other forum I've come to conclusion that I'll use RSD-60G-3.3 an Uin 9÷36V Uout 3.3VDC Iout 12A converter with 2k resistors for TLCs and more efficient white LEDs .
For now everything seems to work in theory.. What worries me, is this post dealing with signal problems. Due to length of whole chain I guess - 100inch(254cm). My driver chain would take about 35inch(90cm). Should I also think about including 74HC7014 hex buffers ?