Light questions for herbs

Hello,

I'm using a 34 inch single t5 24W bulb right now. It's putting off plenty of light but it's not hot at all so my plants are pretty cold. I'm in Tennessee so it's ~ 30 degrees outside and ~ 68 inside (where my plants are). I'm using an ebb and flow system with 10 actual herb plants, not "the herb". I'm testing my system with these before I move on to other things. Small scale first. Anyway, the area where my plants are installed is 3ft by 1.5ft with the light hanging above.

Any advice would be great.

Thanks so much,
Igrowherbs
 
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