FCE-4800 at 100%???

fast and simple -- that's light is fine for 12 / 12 light schedule in a 4 x 4. So, it can easily handle autoflowers too. Becareful, because that is a powerful light and you will burn leaves / bleach colas with it. Some light damage takes a week or two before you see it, but he damage was real before you could see it, nonetheless. if you want to run 1300ppm of co2, stick to 18 / 6 autoflower schedule. Otherwise, it provides near max DLI over 12 hours for atmospheric CO2 in a 16 sq ft context. Just becareful with the 18 hour vege or autoflower schedule. At same height it'd be used for 12 hours, you'll want 66% of the power, give or take. This would provide the same DLI. DLI is how you intelligently apply light. due to local variables, expect some fine-tuning with any suggestion. the math is sound, the variables are volatile.