Foxy base nutes? Additives? Also, what about your rhizosphere? Roots equals fruits. But just based on the lighting, usually 60 watts per square meter is recommended for good yields roughly equals about 600 per meter or 9 square ft and a 1000 watt for 4 feet squared. If not stretching can occur especially with a heavy sun loving sativa, which reduces yields. Supercropping many times can help with stretch increase yield and help with ceiling too close to light issues.