So here's the deal, my room is about 5x10. I'm currently using roughly 50% of the floor space for the plants. 12 main plants vegging under 2 x 1000W MH. I have one more 1000W MH, and 2 x 1000W HPS. The cost of electricity here is sort of expensive at almost 12 cents per KWH. Vegging 20/4 with 2 lights costs me $135 per 30 days. When I switch to 12/12 I'm running less per day so I can run 3 lights and still save a bit off the current electric bill. So my question is, if it costs me $122 per 30 days to flower with 2 x 1000W HPS plus 1 x 1000W MH, but I can flower with 2 x 1000W HPS plus 2 x 1000W MH for $162 per 30 days, will the extra MH lamp give me enough extra yield to make it worth the extra money it will cost for electricity if I use 4 light? Here is a fairly recent photo of my plants.