So you have six plants and two 1k watt lights right? What do you yield and how long are you vegging if the plants are hitting 6 ft tall
Things are drying and curing, so I'm not sure of the yield yet, but there was a big difference between the yield on some plants VS others. The Grandaddy Purple had pistils on it from the start and had big, spongy buds, the Black Diesel was shorter and very leafy/bushy and had an average yield so far, although I think the GDP was a bigger yield. Trainwreck was a decent yield but had fluffier buds. The three old school Sativa's that I ran all had good yields with nice buds, but not in nugget form. The biggest problem with the Sativa is that they grow so tall even with a lot of training. Mine actually grew above the horizontal level of the lights but, since they were surrounding the lights, I still got a lot of light to the tops and got some nice 12" or so colas from them.
I first noticed years back that the plants that grew in the corners of the room grew best and had bigger yields than the plants directly under the lights. This is the 1st year I tried using 6 females, usually I have 4 or 5, but had an extra this year. This is what caused me to spread the plants out to surround the lights and is by far my biggest yield. By letting some of the plants go until the fan leaves shriveled and dried up...sort of like field corn late in the season, I easily bulked the buds up by 2X compared to what I normally saw by following the standard % of trichome method that is used for determining when things are ready. It is a lot stickier and bulkier with a lot more aroma than the buds taken down 2 weeks earlier, following the sage advice of 30% cloudiness.
I let them veg from seed pop roughly 8 weeks. The Sativa's should have probably been turned to 12/12 a week earlier, but they grow lanky and tall, so they are a bitch to keep under control...I couldn't imagine trying to grow one in a tent. The others were given to me as clones and were about 8" tall when I started. They all grew up together, but the Sativas (started from seeds) were a little behind the clones but caught up and then some by week 6. Regarding my choice of lights...I use a MS1000 and a Eye Blue
Hortilux for growing, and a MS1000 and a 1000w HPS conversion bulb for flowering. The HPS DOES make a difference in the final product, but they did pretty good under the MS1000 as well. FWIW, the MS1000 usually has a little more red in it's spectrum compared to regular M1000 bulbs, which are mostly blue in color. Again...this is my opinion and your results may vary.