That all depends on where you are growing, ie a tent or just a space in an attic. How many plants do you have ? How long are you going to veg and how tall are they now ?

Personally I would go with at least 400w of 2700k CFL pm2 with a decent reflector of course and in a 100% reflective mylar grow tent.

I use 190w of LED but this is supposedly equivalent to 600w HPS the company says and I did get some wicked results on my last grow.

I also use 4 x 20w of CFL but this is mainly for heat purposes as my LED runs cool. So in theory I would be using 680w in my 90x90cm space. But I only use 270w.

But LED, well, good LED lights are a different ball game. You can see in my second grow in my signature to see how my plants are monsters after just 4 weeks of growth.

I can fit 4 good plants in my 90 x 90cm space. Any more and I will be cramping my space and the plants will be fighting for the LED light. 4 plants is just enough for a 1m2 space.

Well, unless you are trying a SOG grow.

So I'll leave it with you what light you want to grow with. But I would say a minimum of 400w for a 1m2 grow tent. I might even go for those umbrella shaped hoods to get even coverage too.

Take care dude

S.L.