Quick question

Depends.. you would have to veg longer to achieve the same thing with the lower powered bulb.

Keep the bulb closer to achieve similar internode spacing.

But you'd be better using a mh bulb for veg.
They aren't expensive.
They hit 2ft in 4weeks so there just under half my tent but I been using 400w I’m try trying to decide if I want to continue 400w or just use 600w
 
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