I hope to be able to test several aspects of these light's
performance, specifically:
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Initial Impression:
These lights were shipped to me with 35 watt ballasts and H3
bulbs. They are also available with 50 watt ballasts
(which we would want) but these are just for preliminary
testing. I have powered the lights but am waiting for the
special AMP power connectors that connect to the ballasts.
The guys at HIDFogLight.com have set up a room on their
HID Forum for Experimental Aircraft lighting. I will be
hosting Q&A's there. |
30 watt 3.5" HID Lamp
with H3 bulb at 6000K.
This lamp has a narrow beam pattern suitable for a landing
light. |
30 watt 2.75" HID Lamp
with H3 bulb at 6000K.
This lamp has a wide beam pattern suitable for a taxi light. |
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Learning Curve:
As you can imagine, HID lighting is a new
technology and their is a lot to learn. All I know is that
these lights are super bright! They have no
filament to break and have a burn life of about 5000 hours.
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Mounting:
These lights both come with a "U" bracket
which attaches to the lamp body with bolts. The ballast
attaches to the light body via a 16" insulated cord. It
does not appear the cables are twisted or shielded in any way. |
3.5" Side view |
2.75" Side view |
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Ballasts:
The ballast is well constructed but does not
incorporate any sort of mounting bracket for attaching it to the
aircraft. This would have to be constructed. The
connectors are water resistant AMP connectors. |
Ballast |
Ballast weight is 13.5 oz. |
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Housings:
The lamps are constructed of aluminum and
appear well made. The lenses are glass and of significant
thickness. |
Glass lens |
Glass lens |
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Reflective Heat:
After as little as 5 minutes, it is apparent
the lights emit a great amount of heat. I will be trying
to measure the temperature at a point 3" in front of the lens.
(See Temperature below) |
3.5" HID weighs 11.1
oz. |
2.75" HID weighs
11.0 oz. |
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Electromagnetic Interference (EMI):
I was able to detect EMI at a range of 5 feet
using a handheld VHF transceiver. Obviously, this is a
problem. Initially, I would suspect the H3 bulb, the
ballast or the cabling. I'll report more on this later. |
3.5" HID + Ballast
weighs 1lb 9.2 oz. |
2.75" HID + Ballast
weighs 1lb 9.2 oz. |
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Temperature:
We measured the temps for the 35W lights as well as 50W
lights with a laser temp detector at a point 1" in front of the
bulbs. After 5 minutes, the 35W bulb temp was 160°. The 50W bulb temp was 195°. |
The 3.5" HID draws
.45 amps |
The 2.75" HID draws
.44 amps |
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An interesting point about the
H3 bulbs and 35W ballasts, like nearly ALL other HID systems
developed for use in autos, is that they do not incorporate any
shielding against EMI/RMI. The result is they are
basically incompatible for use in aircraft. The H1 bulbs
are different in that they have the igniter built in to the base
of the bulb...Unfortunately, they too do not incorporate any EMI
shielding. |
50W |
Test |
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UPDATE:
The guys at HIDFogLight.com are shipping me a new 50W ballast
and bulb for testing next week. These ballasts are made in
Germany and have far better shielding than what I have tested so
far.
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6/11/07:
Today I received the 50W ballast and bulb from Aram at
HIDFoglight.com. On initial
inspection it appears well made with a cast aluminum housing and
flanges for attachment. The cabling is
approximately 12" in length but is neither shielded or twisted
pair.
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This is the 50W H3 bulb.
It is 6000K which is nearly pure white. The molded bulb
holder is larger in diameter than the 35W H3 bulb and is not
compatible with the holder clip of the 3.5" lamp.
I powered the bulb and determined the bulb
needed about 10 seconds to fully illuminate.
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The EMI discharge is MUCH
improved over the 35W ballast and emits at a range of 8' (as
opposed to a range of 12' for the 35W ballast).
These things are really bright! We're on
to something now! More testing details soon. |
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RMI/EMI Shield Testing |
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I ordered a sheet of RMI/EMI
polyester shielding film from Allied Electronics and received it
a few days later. It resembles mylar but is actually a
pretty sophisticated sheet that is embedded with aluminum.
This film is rated to shield most effectively in the 100-300 MHz
range.
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I conducted initial testing by
just loosely wrapping the ballast in the shielding film and
found the RMI/EMI range to be reduced to around 4-5 feet. |
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I then cut a piece of shielding
about 12" square and wrapped the ballast tightly. Now the
RMI/EMI range was down to 2-3 feet.
Next, I tried wrapping the ballast as well as
the cabling up to the bulb but found no improvement in the
shield effectiveness. |
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Conclusions:
The 50W ballast and bulb combination
is clearly a vast improvement in lighting over any other
available technology. The 6000K light color is a pure
white color and works well for crispness and clarity.
The temperature output, even at 195º,
is reasonable and manageable for short-term operations.
The RMI/EMI bleed can be managed down to a range
of 2-3 feet using the inexpensive shielding (approx. $10 for a
36" x 42" sheet). While this would still have negative
effects for using the lights within 2-3 feet of any antenna, the
antenna would theoretically only be ineffective when the lights
are turned on (as in taxiing, T/O and landing operations.
I will be discussing my findings with the
technicians at HIDFoglight.com and
report back soon so stay tuned! |
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New Lamp Design:
Here is the new design we are
considering for the lamps. They offer a bulkhead install
with infinite micro adjustment. |
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Update 12/24/07
I got the prototype lamps and tested them
for light output. I must say they are really nice and
appear to be made out of some sort of magnesium alloy.
Unfortunately, they will not fit in the -9 wingtips. The
max diameter the wingtips will allow is 3.50". While these
lamps are 3.5", they have four adjustment flanges that make the
lamps a total of 5.5" overall. These
lamps will work great for those builders seeking to upgrade
their leading edge light systems.
Contact me if you are interested.
We are still working to find a smaller lamp
that will fit the wingtip yet perform with sufficient light
output. |
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