I guess it's more about what you want to do with it as far as "spotlight" goes, but we've got a nice tactical flashlight (not necessarily used in tactical situations) but it spits 800 lumens and has a sliding lens to give awesome near or far light. Much better than any big spotlights for size and use. It'll light up the dock from 300-400 yds out perfectly. I'll check it out tomorrow and get you specifics, but it's going to be a little spendier than a 12v plug-in.
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