An update from a post by Matthias in another thread "...I recommend to start with 4 x double rows for your 2000l, if it is not enough maybe a 5th row later..."
So the setup would change to :
- Eight GHL Mitras Lightbar Daylight 160
- Three Mitras-LB-PSU300
- Three Mitras-LB-Splitter
- Three Mitras-LB-Profilux-Cable Interface Cable
- Two GHL PLM-RS232 PL-0601 (to add a second RS232)

OMG this is getting expensive...

Some of my questions still stand :
Question 1 : Do you have any better suggestions ?
Question 2 : Could you tell me what are the PAR/PUR measurements for the GHL Mitras Lightbar Daylight 160 and how they compare to the Razor 160w R420r (see attachement) ?

New questions :
Question 3 : What is the weight of a 160cm mitral light bar ?
Question 4 : Do you have any suggestions to hold these bars on my 3550cm tank ?