From: Nicholas J. Yasillo
Sent: Tuesday,
November 15, 2005 8:38 AM
To: "Max Lumens"
Subject: RE: HIR bulbs
Follow Up Flag: Follow up
Flag Status: Flagged
Hi Max,
Thanks for the fast shipping of the 9011 bulbs. They arrived
on
Saturday and
I installed them late last night (Monday). Since I'm an
engineer, I couldn't
just install the bulbs and then make a
subjective judgement of
their effectiveness. Just had
to make some
objective measurements.
I have access to a lab-grade,
calibrated foot-candle
meter which is
optimized for incandescent
lamps, so I set up a simple test
arrangement to get "before and
after" numbers.
The test vehicle was my 2005 Subaru Legacy GT which came
equipped
with 9005 high beam bulbs. The OEM
bulbs delivered
with the car were
Sylvania 9005s
and had less
than 3 hours of total use on them.
Envelopes were perfectly clear with no discoloration
or visible metal
deposits.
The center tab of the 9011 bulbs was modified
as per instructions to
allow mounting in the 9005
sockets. All measurements were made
with
the engine running at idle
and the cooling fan off. Voltage was
measured at the battery and
was between 13.98V. and 14.06V. for all
measurements.
A calibrated Weston Model
514 Foot-candle Meter
using a 37mm dia.
silicon photo cell was set up on
the central axis of the high beam
reflector 96 inches from the left
headlight outer lens and
21 inches
above floor level. Lamps were on for 5 minutes before each
measurement.
Intensity readings were
taken of:
Low-beam only
OEM 9005 high-beam only
Combined low+9005 high
9011 High beam only
Combined low+ 9011 high
The meter was not moved
between measurements.
Light intensity readings:
Low beam only = 248 fC (projector
lamp, light is concentrated) 9005 high beam
only = 122 fC combined
low+9005 = 370 fC 9011 high beam only = 212 fC combined low+9011 = 460
fC repeat low beam only = 248 fC
This is only a "spot" measurement taken at the
center of the
high-beam pattern, but clearly
there is a dramatic improvement in the
light intensity;
The high beam center axis intensity has increased
by 73 % (212 fC/122 fC) and
the combined intensity has increased
by 24 % (460 fC/370 fC).
I did
take the vehicle out for a short test drive on
some very dark
roads.
Subjective differences noted
were that the 9011 high beam
pattern seems to be slightly more
"peaked" in the center than is the
case with the 9005 bulbs, but this
is actually an advantage and
gives
a nice "long-range driving
light effect" to the high beams. I
also
noticed that a reflective stop sign that
previously was just barely
visible at a 1800 ft. distance
with the OEM high-beams, was now
bright and
much more apparent. These lamps are definitely
a major
improvement over the OEM
9005 bulbs.
I've attached a few photos
of the test set-up and some shots of the
foot-candle meter
measurements.
Hope this info is helpful.
Thanks for making these bulbs available.
Regards,
Nick Yasillo


