Ensure the light stays at least 10cm from any leaves (so as to not burn the leaves).
Adjust the timer to suit your plant's needs
12hrs for plants in spaces with low light levels
9hrs for spaces which receive indirect natural light,
3hrs for plants in high natural light environments).
Also consider the natural environment of the plant you are growing - indoor plants may not need much supplementary light, whereas something like basil will need a lot.
Adjust light brightness; we suggest starting on a dim setting and building up to the brightest setting, this will allow your plants time to adjust. If you see your leaves "burning" or browning, reduce the light intensity.