I've had plants taller than 170 cm with HPS lamps, but most of stretch is spectrum-dependant. Now with LEDs I can manage quite well even with landrace sativas. I rarely go over 150 cm now even with the most extreme ones. I also trim some tops.Nice thread! Lovely looking strains. Going to have to find a nice sativa to grow next cycle now. How tall do they get usually? You get good size colas for just 3L pots!