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Since the effect seems to be caused by a silicon component that isn't properly shielded from light, anything with a photon energy higher than the bandgap should do. The bandgap of silicon is 1.1eV, which means the effect should start in near-infrared.

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What about glass, then that should work, right?

Not sure I understand you correctly.

The problem should happen with near-infrared, visible, and UV-light. Glass is transparent in the visible range, and depending on type, also in IR / UV, so glass won't work as a shield.

The easiest, reliable way to shield would be wrapping in aluminum foil (also helps against RF-interference).

Yeah you are right. I was assuming that the chips would block visible light but I forgot about UV.

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