Well, you're right about more power means more yield, but it's not all about power: you need that power to be delivered in the correct light spectrum for each stage. That's why you cannot grow a plant with a powerful standard light, for example, cuz it won't cast the wattage in the adequate color spectrum (frequency) the plant needs to grow, fatten or do the photosynthesis. But you can try and compare the results. Maybe it works .Hope it helps a bit!