Yet another light question.

I currently have 10 seedlings under 2 1600 lumen screw in type Fl bulbs, should i just byte the bullet and start up my HPS bulb? I don't know if 3200 lumens is enough light for 10 seedlings to live on. I was planning on using the Fl for 1 month and then switching over to HPS, maybe i should just turn on the HPS and get it over with eh?

SG

p.s. temp is currently averaging 74 degrees in the room, only should get cooler as winter come on. room size is 2x4 feet and 7' high with shower curtain, light bulb is a 400 watt HPS with a fan for circulation and a fart fan for ventilation. thanks for any help!