Well, I do know that red light tends to be "better" for flowering. But the reasons behind this still puzzle me. It is true that Cannabis uses red light to time itself, but I don't understand what the connection to chlorosis might be. One thing to consider with all of this, is that often it isn't enough to just know wattages, lumens, etc. What's really critical is PAR (Photosynthetically Active Region). I use a PAR meter in the lab, but haven't used it yet for my home grow. PAR measures the intensity of light in the relevant wavelengths, and ignores others ( for example, green). It is often surprising to discover that what appears to be a very bright light source may have fairly low PAR levels. This is the measurement that would be really useful in comparing your setups. Also temperature of the soil/water can affect nutrient absorption. Colder temps tend to inhibit uptake of minerals, especially phosphorus. You might want to stick a thermometer down in the pots and see if there's a difference. OR, we could both just STFU and let the plants do there thing.