Number 3. Using LED grow light(red blue yellow) with two additional heads (red blue UV). Energy usage is negligable. Using Reefertilizer Grow & Bloom system, but at a quarter dose as my seeds are autoflowers. And using autoflower feminjzed seeds from Homegrown Cannabis Co. Soil is organic compost mix thats been washes to remove excess fertilizer before planting. 14gal Pots. Full sun from 2pm est to sunset, lights 20-24hrs(timer has cut on randomly).