Where 5mm is the maximum dimension / available space of the original bulb so
you cannot turn aroud the LED. Would be useful for replacing awkward voltage
festoon bulbs.
The maximum beam of 5mm LEDs is axially but how to convert to transverse?
Grind an angle to the dome and melt on some mylar?
Wrap whole LED in mylar except for an axial slot?
Abraid the LED all round to make translucent rather than clear?

Then adapting AC or DC supply to suit

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/