Cabin Lights

As I mentioned earlier, I'm installing LED cabin and panel lights. They're home-made...I didn't care for the off-the-shelf fixtures I've seen. Plus, I'm an engineer...if it's easy, a liberal arts major could've done it! So these are sets of white and red LEDs (white and red are mutually exclusive) driven at about 3 and 2 V respectively. A DC-DC converter lowers the 14 V down to the 2 or 3 V.

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There are two of these light fixtures, one under each armrest. They each have five white and five red LEDs. For the terminally curious, they're about 2000 mc each, with a 30 deg view angle. The idea is to illuminate all the little nooks and crannies into which I've dropped a pencil or an approach plate while flying a Cherokee or a C-172. Usually, those items are lost to me until landing.

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Backside of the LED fixtures. They're a bit of a hack, but a) nobody can see them under the armrests, and b) if they fail, the most they'll do is blow a 1 A fuse.

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I call these "Cabin Lights" as opposed to "Panel Lights" or "Map Lights." All three have their own switch. The Cabin Lights are powered off of the hot battery bus. That way, I can turn them on before boarding, to help unsnarl the seat belts, load luggage, find the master switch, etc. The switch, along with a couple of other switches I wanted handy, or on a little triangular subpanel I made. Any questions why I'm not flying this "QuickBuild" kit yet?

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By this point, most people are fed up with my bleep-ing LED lights, but I can't let it go, sorry. Here is the little DC-DC converter that powers them. It's about 85% efficient, which is waaay better than pissing away 6/7ths of the power in a resistor. Gotta save that last watt, you know...while I burn 10 gph of avgas. It's a switching converter, so it may wreak havoc with my radios, but we'll see. It may then quickly become a resistor!

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To quote Gordon ("The best pilot ya ever saw") Cooper, "Oh, Lord, what a heavenly light!"

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The number of times that I had to load or unload a Cherokee in the dark is probably only 10 or so. But it really pissed me off, so my RV-7 has bright lights in the baggage compartment. White and red, of course...don't want to ruin my night vision before a flight. Afterwards, it doesn't matter.

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I also put one of my homegrown LED fixtures under the panel so that I could retrieve crap that falls down there.

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The red lights are brighter than this photo shows.

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