Question About Flowering Under T8 Fixture

I'm trying for the first time to grow to harvest under this T8 fixture. I've started plants under this light before but have always moved them outside.
I have a T8 HO fixture with 6 bulbs and currently using 5000k bulbs.
My question is what bulbs should I use when flowering? They have bulbs available in the 3000k range, should I go with 6 of the 3000k or should I keep some of the 5000k bulbs in there?
I'd appreciate any help I can get.

Here's a pic:


Here's what she looks like after topping:

Keep the light close like 4 " and use a mixture of both 3000 and 5000 spectrum. It works just fine as long as you keep the light close.

Thank you for your reply. I went with (5) 3000 and (1) 5000. I keep the light as close as I can.
Do you think it would help to supplement with cfl's?

I think with the 6 bulb unit you should be more then fine. If during flower she starts running and that strain has worthwhile lower buds just add a few.
looking good and good growing

She's starting to show signs of flowering. Still really bushy.

https://pix.sfly.com/_DHjny