Some growers like to wait until the Kannabis plant matures before changing to flower cycle others change to flower cycle when the plant is 6 to 18 inches tall. When the leafs grow across from each other the Kannabis plant is immature. In the pictures you supplied those plants are immature. Once the leafs stop growing across from each other the plant is then mature.

The light you are using will lower the yield and quality.

Good Kannabis Growing!