US: horticultural lighting group(HLG), timber growlights, pacific light concepts, Amare, im sure i forget someone...
Canada Bc blondes or HLG canada.
Australia: Cutter electronics or even better, hit up
@Prawn Connery for a look at his boards, but remember these are really geared towards flower and not vegg
Uk: diyleduk.com or invisible sun horticulture.
There are some others, gavita , fluence which all have good units.
Most people around here would probably advice HLG.
I hope that if i forgotten any sponsor you dont hold it against me.
I would probably rec a hlg550 if you have plenty of height or 3 x their 240w units or even 5 single units.