My only suggestion is, if you wind up buying a light that requires batteries, buy rechargeable a, and charge them nightly. I would consider going with the $100 units, but that being said I believe MEC has a generous return policy, so you could buy one and try it for a few days.
There are numerous other sites out there, but MeC usually sells quality stuff.
If you buy a unit with a high/low setting that should be enough.
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