Agreed. From everything I have ever heard, read, etc. it's not going to make much difference. Might save a little on electricity, but not enough to matter probably.i think the "norm" is using the smaller light to veg , but that is unnecessary. it wont help to use a smaller lamp unless you have too much light or your temps are too high. stick to the 6.
soil
When I first started, I used daylight bulbs in a regular 4' fluorescent fixture. As far as the veg stage, I can't really tell a difference. Flowering is a whole different story of course. loldamn it all ive been using 400 watts of t-5's for veg cause I like that spectrum but sheet mang maybe I should just 18/6 that hps cooltube for veg with some 54 watt t--5's as supplemental during the veg. Good thread my man!