4 days old seedlings...

hey guys i have 6X 4 days old jack herer seedlings under 2 double 4foot fluoros, i got a 400w mh but i dont plan on using it for 18/6 before they're 10 days old as i usually do. i was wondering if it would be a good idea to use the fluoros for maybe 12-14 hours and the rest of the time use my mh so the plants get more light and lumens. At this age can they even benefit the higher lumen output. Is there any chances it would stress the babies and make them hermies... thank you guys.

Yes it would stress, stick to the flouros till they are older.

alright thats what ill do then, thanks for the input.