long : 149 mm ,
diameter on handle : 30 mm
diameter on head : 46 mm
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yes it could variable focus from 3° - 25° id did not measure it . Inside is CREE XR-E . Makes really nice tight beam . On projecton image I could see some reflection from emitter on the wall at tight beam . ( probably from thick mineral glas - might be some inside glass coating good solution ) .
Good point is that much more pricy canister light VB-50 have same head with SST-50 . ( I don't need so tight beam but I like powerfull penetration I have intend to made some special aperture in way ''condenser'' lens to combine beam shape and powerfull output )
I like also uniform illuminated surface at wide ( no hot spot or even corona )!
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I'll use my standard canister with 10Ah ( I don't work with backups for buckups - doesnt have sense )
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I'll like to have some real small light for travell and exercises in pool
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Thinking to put maybe two drivers inside one for 5A (50%) and another one 9 A (100%) to use advantage of build in reed switch and give light some redundancy ( main switch is on canister lid) ; place is not problem.