Hey Buddy, which bulbs do you have for that T-5?
My point I'm getting at is, do you have both sets, vegging and flowering bulbs?
If it were me, I'd use the T-5 for vegging and both lights for flowering, even if I only had the vegging light bulbs, I'd still use it during flowering, as side lighting. Hang it on the wall, facing your plants during flowering.
Peace