Using 400W HPS and 6500K fluros for vege stage

Hi

I have set up a 1 x 1 meter room for flowering. I am currently using it for the vegetative stage as this is my first round (2 x tangerine dream seedlings currently 2 weeks into vege)

I have made up a 3 x 34w 6500k fluro setup from some old ballasts and fittings and have already setup the 400w HPS in the room ready for flowering but thought I would try using both the fluros and HPS together on a 16 hour cycle while still in the vege stage.
Could this be more beneficial than just using the fluros or would this just generate more heat and waste power.

Any advise would be much appreciated.

Cheers

it's almost mandatory if you want good growth, 3 tubes won't be enough.
Nothing wrong with HPS for veging but a 6500 K MH is ideal