Light burn usually results in a dry crusty leaf; almost like a sun burn. It's very hard to tell buy the photos though.
The leaves do kind of have burnt tips that are in-ward curling, which is a symptom of light burn.
Are the leaves moist or crusty?
If they lean towards moist, you may have nutrient problems.
Nutrient issues can occur from a variety of different sources; most common being pH or growing medium that's the culprit of the issue.
What's your growing medium origin?
good luck buddy! I'm using an led (1000w actual draw 110watt) for my first grow and I have some crusty leaves lower down my auto, most of them have gone now and the rest of her is fine and I guess it was down to me having the light too close for the first weeks of its life. check out my girls :)
thanks for replying so quickly.. leaves feel moist.. the 300w led was about 5inches away from the plant so made me think it was some sort of bleaching? I have since moved the light to 15inches .. the medium is a light compost.. This is my first attempt at growing anything so all help would be greatly appreciated :)