"Kyle Boatright" wrote

I'm considering upgrading from a 50W Halogen lamp, and understand that I
should get ~2x the lumens from a 30W HID. This light has a 12 degree beam
angle and the housing is 2 3/4" in diameter. Their floodlight (in the
same housing) has a 36 degree beam angle.

If going into a homebuilt, why don't you consider going to an auto salvage
yard, and having a look around? There are many cars, and have been many for
about the past 3 years, that are equipped with HID's, and would put out a
lot more than this pint sized motorcycle head and handle bar lamp. Read
"magnitudes" more.

I would think that the selection and price would be pretty good, by now.
Also, many have lenses that could be spaced at different lengths away from
the light source, for an adjustable focal length. That sounds like a very
good option, to me.
--
Jim in NC