Yes, any form of light energy can burn plants.. All plants have a range of how many photons they require to stay healthy. Past the optimum range, the plant enters a state of photoinhibition which can lead to the death of your plant.
It really depends on the power of the unit. My LED panel is 2 inches from the top. Any closer and buds can suffer from light bleaching. Bleaching has occurred in my current grow. Not that big of a deal though.