Light responses

[QSHIPQ@aol.com]

I have gotten several private posts for followup to my ligting post.  I will
try to clear some of the "stray" light that might have presented itself,
given the complexity of the former post.


Stray light - any light that is not controlled either by reflection
(reflector) or refraction (lense).  This specifically refers to P lights, in
that light is not "controlled" by reflection, only refraction.  Stray light
in P lights happens because the refractor (lense) design is 3 dimensional, in
other words the beam pattern is designed through the thickness of the lense.
 Since the reflector is designed to be just that, stray light appears because
the lines through the glass become prizms as well as filters, by design the
flaw to P lighting.  Adding more lumens increases this prism effect, so any
gains in "brightness" are offset by control.  On a H4, this is exponential
because of the complexity of the "dual" purpose filter.  On a Rallye 2000 for
example, the prism effect is minimal because little lense pattern is needed
do to the size of the light (P, the larger the light, the more the light).

Parabolic lights - use halogen bulbs, some Ion Crystal
FF - use halogen, IC, XMS, 
DE - halogen, IC, XMS
HID - XMS

DE Projection type light -  The definition should read:  Uses 2 reflectors
and lense to control light, I wrote "reflector and filter", which by
definition are the same thing.

PIAA claims to have higher output HID than 100w (effective), and others have
claimed this as well.  I have not recieved my info from them to confirm this,
tho given their DE propensity, I would surmise this to be a way to increase
the limitation of aperature size with lumens, a valid argument.  I will post
on this upon receipt.   

Some of the slams of Avi recently, and you know who you are, should be
recinded, at least privately, I found his posts to be more correct with my
research than the "slammers".  FF technology is really where lights are going
in the next 5 years, regardless of what bulb you put with it.  The need for
no filter creates some exciting potential in this area.  DE physical size for
output is exciting too, tho it has limitations due to aperature, for fogs a
great idea at the least.  HID, that's a tough sell, the cost of this is just
too high to justify, I really think it will stay at the high end, as FF
technology is still in it's relative infancy for production aeros and
dual/quads.  

Those of you with US lights really have a filter and bulb problem, addressing
the bulb is good, addressing the lense better.   Those with aeros, I expect
that technology will leave these at the bottom of the list until FF
technology trickles down.  P lighting favors round reflectors, FF favors
neither.  Right now, the easiest way to upgrade your US P car is to add the
euros, for a better P given the physical light.  Quads round conversions in P
lighting to me, offer the best solution, since in P lighting they are at
least aeros equal (control vs size a wash), and when FF technology gets to
quads, you have a relatively simple upgrade available.  

HTH

Scott