That's an odd quote, bordering on is misleading.
Light (any light) is photons, it doesn't 'contain photons'. The total energy flux of a light source on a surface is determined by the frequency of the light (its 'colour') and it's intensity (number of photons). Sunlight and daylight aren't special, they're just different photon intensities, with maybe a slightly different mix of frequencies.
Crudely, solar panels are tuned to a specific frequency of light, somewhere in the infrared from memory. Below this, no matter how intense the light, the panel won't generate any current. Above this frequency threshold, the current will increase as the intensity increases up to a limit imposed by the cell design.
Current is affected by heat, as solar panels become less efficient as they warm up. Managing heat dissipation can be an issue for some large installations.
