On 11 Jun 2010 as I do recall,
Adrian Stott wrote:
[snip]
> AIUI, the bullseye should be installed with the curved (convex) side
> *down*. This lights the interior better, by dispersing the light. If
> the bullseye is installed the other way up, it concentrates the light
> (and heat) on a point in the interior.
>
> Again AIUI, people tend to install them upside-down because that way
> water can't accumulate on top of them and eventually leak into the
> interior.
>
Dane's bullseye is certainly installed curved side down -- and is
certainly very effective. (With the back doors shut, this is the sole
source of light in the entire cabin; and it's enough to illuminate the
whole place clearly when you wake up in the morning....)
A drawback not so far mentioned of mounting the lens this way up is that
the accumulated moisture of the night's breath accumulates on the
underside of the glass, runs down to the lowest point of the 'bump', and
procedes to drip off down the back of your neck as you dress!
--
Harriet Bazley == Loyaulte me lie ==
Power tends to corrupt and absolute power corrupts absolutely
