I prefer the Fenix L1T. Instant on or constant on, and it uses a single AA battery. In the long run it is significantly cheaper than the 123A batteries, especially if he plans on using it for anything more than a bedside flashlight.
As well, there are some excellent rechargeable AA batteries out these days,
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But I am like a green olive tree in the house of God: I trust in the mercy of God for ever and ever. Psalm 52:8
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