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Bringing your own small torch to gently illuminate some of the more obscure reliefs is always a good idea.
Watch out for the guards in the tombs that may offer to take your picture which is against the rules for some baksheesh. If they get your camera they can take any sort of picture, then report you to the authorities, which is a big hassle. Beware that a camera flash in a tomb will alert the guards to picture taking that is STRICTLY FORBIDDEN. You will be given the choice of leaving the site not just that tombor paying a second admission fee.