Question: Veg-room 600w/Bloom-room 3600W?

I planning to only have 600W MH in my veg-room because of limited space, and 3600W HPS in my bloom room.
Do I need more power in my vegroom? Is 20-30cm big enough for blooming in the V2 Multiflow system?

I'm going to veg them in GHE Rainforest and transplant them in a V2 Multiflow EBBnFLOW when the plants are ready to bloom.

How many plants?

36 plants. so 6 plants pr 1m2.

Are the Rainforest hydroponics system to little? I know that some growers use it to blooming in SOG.

I would go with a real big reflector in the veg room.

Thanks. I have a adjust-a-wing for the vegroom, but the size of the GHE-rainforest system restrict the plants in size. 67cmx67cm

Any inputs?

For what it's worth, I personally think you should have more light for your veg room. I run 2 600 w HPS lights in a 4X4 grow tent for both veg and flower.
I don't know though so don't take my word for it. I've vegged 6 blueberry under a 2 tube t-8 light once and they vegged just fine but they grew at about half the speed as they do under 600w HID . I flowered under 600w. I'll bet your plants will veg ok under 600w but I would not be suprised if the perimeter plants grow much more slowly. I also grow in soil so I'm not familiar with your hydro system.