Flowering?

First time grower these girls will be five weeks old this weekend fimmed about 3-4 days ago worried I might not have enough room if I wait much longer was going to switch to 12/12 later today or should I wait a little bit longer I'm not sure just don't want to flower too soon or too late my tent is 3x3x6 and the girls are little over a foot tall now and I now they strech a lot when switched to flowering
 

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