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Wow, a physics expert. In your opinion, they are useless. They shield all the light that I need them to shield.
Rubber does not absorb energy. What a crock.
And in case you don't know it, the main purpose of a lens hood is to prevent stray light from reaching the lens elements, not for protection. If you want the best protection, use a protective lens case.
knock-off (plastic) hoods are cheaper and work just as good as the 'official' hoods