I estimated bout 700 but they r 25 days old n had sum issues and severe bleaching, i fully expect them to be at bout 40-50cm during bloom as suggested, and didnt say burn but far mor severe than the light bleaching u have experienced n considerably quicker so was defo too close n when I eased up it stopped n my plants have zero stretch even corner plants r not leaning into the centre and growth is strong n quick especially considering the issues so my distance being too far is defo not the case nor a problem and will b adjusted as they grow however the only suggestion so far to my problem has been light bleaching so if anything they have grew too close for their young age however not set on that diagnosis yet but thank you anyway, the vipars look gd I've never seen em or head of em till now, atleast the company looks fairly reputable unlike sum...