it's not just visible light, it's UV light and higher frequencies also. The lower frequencies (higher wavelengths) like IR do not help produce electricity

Usually an incoming photon of light needs to overcome an energy barrier to produce an electron for eletricity. In silicon, this is known as a bandgap. Therefore only the more energetic photons like UV and green light, x-rays, etc. will contribute to producing electricity

Light of Destruction Full Spoiler

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