Sure. If it is just a flat, bring it in just before bedtime and out as soon as you wake up during this sensitive time of development. There is only arguable benefit to more than 16 hours of light, which I wouldn't do. I would not expose them to night garage forecasts under 55 F, which gives you room to play in case it gets a few degrees colder than you thought.

PC

Yes, definitely move the sprouts away from heat mat and put them under light, at about 2" distance. You can also make an enclosure around the lite to keep them warmer . Also as an option, a 60w incandescent light can provide enough heat inside an enclosure.

Seysonn