CFL T5 and Spider Mites, oh my

Hello all,

I'm using a small 4x4x4 space for Veg cycle. I only have three lights total now. Two single 24w 2" light strips and a T5 double 24w strip. I am leaving the light on 24/7 and I take them outside for the day twice a week for water/nutes. I wanted input on the most cost effective addition to this setup. I am getting growth, but it is slower than it was outside over summer. More/Different CFLs?

I am developing a spider mite problem. There is powdery mildew on many of the large fan leaves. I took them outside today and heavily sprayed neem oil over the tops and bottoms of the leaves until they were dripping. That has done the trick before.