Guys (and gals, let's be PC), my situation is getting worse by the day. In 
Paris, I did not have my aircraft with me. Here, in Canberra, Australia, I 
don't even have my workshop! My aircraft and my house contents are not 
likely to arrive here anytime soon, so, I'm down to making research on 
accessories (sob!)

Anyway, I have long wanted to find a LED-based solution for my lighting. 
Why LED? Well, apart from the fact that they drain a fraction of the 
current that conventional, incandescent bulbs drain, they are also cold, 
and therefore, do not crack the plastic used for the fairings! Even Whelen 
is now making LED-based lights (although at awful prices), so it is 
clearly the future, even in the conservative world of general aviation. 

The tail light is now a no-brainer. Having bought a LED-based replacement 
light for a car indicator light (BA-15S type), I have tested it, and I can 
tell this is plenty bright. It beats a conventional (incandescent) bulb My 
worry was that being LED-based, I suspected it would be way too 
directional for the application. Not so. Now, I just have to find the 
right cover (ideally, a 1 inch diameter dome-shaped diffuser).
To see what that kind of bulb looks like: http://www.boatshop.com.au/prod129.htm

The position lights gave me more trouble, until I recently discovered that 
cheap LED-based solutions have arrived in the boat market. I have found 
one with a stainless steel case (white or black plastic cases are also 
available) and an acceptable teardrop shape. There is little effort 
required to adapt them to the KR2: just install a nut to screw them in 
place! These things are sealed, waterproof, and they cover a wide vertical 
angle, because they are meant to work when the boat has bank. So, they are 
nearly perfect for our application. See them at: 
http://www.boatshop.com.au/prod142.htm

While I was at it, I also bought some LED festoon lights, and after 
testing, I believe I will be able to make a decent instrument panel 
lighting system out of them. I will simply machine some Nylon holders, in 
two parts, allowing to pinch the bulb in between the two halves at the 
desired angle. It should take 4 or 5 to light the entire useful section of 
the instrument panel. Have a look at:
http://www.ledshoponline.com/automotive_leds_festoon.htm
(I will use the flush 6 LED ? last one on the page)

Next item on the list will be the landing light. I'm considering 
installing two 3W 12V LED bulbs (these are direct replacement for 12V 
dichroic halogen bulbs). This would give me roughly the equivalent of 40W 
of conventional incandescent light, with only 6W of battery drain. And 
since the technology is likely to improve fast, I will be able to upgrade 
in the future.
I'm not too sure whether I should go for 20° angle or 50° angle. Any 
opinions on that?
(actually, this is going to give me a solution to upgrade my homebuilt 
scuba diving torches too, but that's another story  - and not KR related). 

See: http://www.ledshoponline.com/ledlowvoltagebulbs.htm#3w

I can't believe how fast the LED technology is coming to life. Two years 
ago, I could not find any affordable LED based solution. Amazing! 

Serge Vidal
KR2 "Kilimanjaro Cloud"
Canberra, Australia


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