Assuming we're talking about full spectrum natural sunlight, UV wavelengths will destroy almost all organic compounds eventually. At normal sunlight intensities plants can repair tissues or outgrow the damage fast enough to keep ahead of the destruction, at least for the FCs they are adapted for. Few would survive the UV in 15,000 FC sunlight for very long. Even the toughest tree bark would gradually be reduced to ash.
For visible wavelengths of light, any plant structures that absorb any wavelength are gaining energy. Even if the excess heat energy is removed there would eventually be biochemical damage to the light excited molecules. No plant will survive long once the chlorophyll or other molecules in the photosynthetic pathway are disrupted, for instance.