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Hi,

I've been thinking about building my own scuba-light (torch) and
have a few questions regarding the commercially available MR-11
and MR-16 12 Volts halogen bulb/reflector assemblies.

I've seen people recommend narrow beam while my tendency is
towards a wider beam to get more coverage. I've found the above
light assemblies in packages marked "narrow beam" and "medium beam"
but I have no idea what is meant by these phrases. What do you people
use and why  ?

Second, is there any reason to believe that the MR-16 lamp will
last longer than the lamp in the MR-11 asumming they are of the
same wattage ?

Lastly, the lamps are stamped/(rated ?) 12 Volts.  The lead-acids I
have are gell-cells and they come off the charger with 13.8 Volts
across their terminals.  They drop a bit in storage but can deliver
quite a bit of charge before dropping below 13 Volts.  In light of
this I do worry about overvoltage unless I pluck the voltage down
a bit. Does anyone have any thoughs on this issue ?

thanks,
john

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