ya that probably is a burn from the light if it touched the leaf or got real close. i had one of my 13 watt cfls touch a leaf on one of my plants and it had a similar look just worse hope this helps as a straight forward answer. and when your plant gets bigger you will need more than 2 23watt bulbs i am running ,1 42 watt ,1 55watt ,1 23watt ,1 15watt and 2 13watt cfl bulbson my plant it is about 2 ft tall and still needs more light in my opinion