thank for the reply bob but i need your help disaster struck this morning i woke up to find a light had fallen on a plant and cause a yellow tip on one of the leaves i have inclosed a pic do you think this is due to the light or a need for fert? also on pic 2 there is a slightly yellow spot on another leaf also not sure if it was burnt by light .

i love my plants please put my mind at risk. : )

im using a 4ft tube flou and two 24v compact flou's (tin foil all round) and using miracle grow potting soil from birth.