outdoor grow with indoor catchup?

G'day everyone from Australia. i have a question about a grow method i have been trying out and want to know if its actually worth it
Ok so i have 3 babies growing outdoors 2 of the seeds are from a different batch but all will continue to be grown outdoors but the single seedling different to the others seemd to be laging in growth rate so i decided to bring the seedling indoors at nite and put it under a fluro in the hope it may catch up to the others, thing is its only a 12v coil fluro so my question is is it even worth it ? the light is nice and close and in the 2 days i have been trialing this the indoor/outdoor plant seems to have gone a brighter but lighter green where the outdoor only plants are a deeper darker green. no progress in growth rate yet but yeh am i waisting my time with that kind of light?? cheers.

Recently upgraded to a 20w cfl 6500k 1040 lumens and the indoor/outdoor is powering! increased growth rate probly due to the almost 24hour light and folage has darkened, but im thinking its definatley a different strain to the seedlings growing only outdoors they are definatley a darker green with thicker fatter folage both types are grow from bagseed from 2 different sources and grown in yeats seedling soil and have been given nutes once a week (Yeats multi nute N10% P4% K6%) but given below reccomended amount is that satisfactory? i have also made up a diluted liquid seaweed by boiling down seaweed which i add a small amount to each water every 2-3 days.
any suggestions to better my 1st grow?

coupla photos 1st is indoors at night under cfl and outdoors in the sun throught the day and the 2nd stays outside.

If your in the usa .The amount of daylight hours now ,outside are not long enough for the veg stage.Im only getting 11 1/2 hours of day light in my state now. Thats fine for flowering .But veg needs at least 18 hours of light per 24 hours.