On Roadrunner 48-029 we're looking for replacement blue backlighting for the circuit breaker panel. It appears the backlighting has been replaced once before, as there is an oddly-wired DC-DC converter to produce clean 24vDC power to 16 separate acrylic light guides with LED edge sources + resistor such that each light guide acts as a 24vDC "bulb".
My goal is to replace the backlights with a similar design that allows for easily changing out backlight components/sections as they fail. I'm also going to replace the reverse-engraved backlit labels as the writing is not easily readable in daylight - the letters are all black, not white-on-black.
I have searched the forums and know that we do not have electroluminescent backlighting. The existing acrylic light guides in the panel are placed there with liberal use of hot glue and clear packing tape. I am aware of the fiber optic mat approach, that might be a way to go but I'd prefer to stick with acrylic light guides.
I'm investigating making light guides with a constant current driver and have been experimenting with various blue LEDs. I have a note in to Paul at Selene Yachts America and haven't heard back yet. I have had several groups tell me they don't make things that small, and recieved one quote for $4,346 to replace the panel backlighting, which seems absurdly expensive to me.
As regards the labels, I'm also experimenting with negative-space inkjet printing onto vinyl (then laminated) to create labels that are not confusing (e.g., "toilet blower" is my favorite of the existing labels) - so far the results are fair: easily readable during the day, not quite as black a surround at night.
A couple of questions:
What have other boats done as regards maintaining/replacing the backlighting?
Would there be any interest in going in on a custom order of light guides (if a custom light guide manufacturer get involved)?
Does anyone have a CO2 laser that would be interested in making pits in thin acrylic?
attached is a picture of the light guide I disassembled this morning.
- rob