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2 600's over 1 1K for sure, but honestly, that is exactly what I have been using for a 4x8 area (32 sq ft) which is less than Leon's 6x6 area (36 sq ft) and I am upgrading to 2 1k's for that 32 sq ft area. Besides Woody's science based minimum 5k and, better, 10K lumens/sq ft for optimum...

Thanks Woody. My first post. By your calculations, Leon's 6x6 space would need 10K lumens/sq ft or 360K lumens for optimum flowering. If a 1K bulb puts out 110K lumens, then Leon would actually need 3 1K bulbs (and clearly, well ventilated hoods) for that size space to be optimum. Am I...