These are part of the reson I am growing a SOG...becasue I dont have room for much else.

I vegged the plants in the pic above for 21 days.

If they double in height, like mature plants would in flower, they will wind up being about 1.5 feet tall buds.

If they triple in height like some mature plants would in flower, they would be 2 feet tall.

You need to have room for containers for your plant and at least one foot of space for lighting.

Your plans to veg with 150HPS will result in longer plants as the light isnt strong enuff to keep them short and bushy...rather they will grow taller and thinner.

I prefer floros for vegging as they are kept super short. But these are indeed some fine floros I use. If its cheap floros or HPS i would go HPS.

So my plants wont be more than 2 feet when done. But I am just doing a SOG, looking for one main bud from each plant. If I can get that I will be happy

Hope this helps.