Re: LED Lights and Fires?
tuxedospike said:
Go on THT and do a search for LED Cockpit lighting... saw something about fires caused by wiring delivering too much voltage for the LED to handle over time...sorry to be so vague but don't remember the fix...only that a lot of kit suppliers don't address this.
Yup, it is caused by the voltage switching boards malfunctioning, I am glad you brought that up. Let me explain how that all works.
I wire my LED's is a system I call the double parallel Halo. I wires each LED with it's own resistor, no matter how many LEDs in the light. This way each LED Burns in it's own resistor. This also alows you to Dim my lights as each Resistor is "custom" burned by the only bulb that will ever draw power from it. So when youy change the voltage, the light dims.. The other way to wire LED's is using a voltage switching board, this is a circuit board that turns any voltage from A to B to operate the light. They claim this is more stable...not form my experiance, I have been wiring LED's with resistors to backlight my panels for years and I have NEVER had ONE burn out...not a bad track record. But they claim this becasue the voltage board is more versitial, they can build one light to suit many different voltages.
this is why you see them say "this light is rated for 10 to 32 volts". The board changes the imput voltage to whatever the lgihts needs, this sound great sure, but not try to dim the light...you cannot, why? simple, to dimthe lights you need to drop the voltage...when you dropt he voltage with these lights, the board compensates, so the only thing you accomplish is making hte board work harder makeing it hotter. And after time, the board can malfunction and start mis reading the voltage imput and the mis calculate the forward voltage, causing heat, and heat leads to fire. ALSO, the other down side is these boards throw off massive amounts of interferrence. We had customers that coudl not Key up thier VHF radios because the mast head light was interfering. At the newport boat show a crew hand on a 12 meter racer told us that they spent 24 grand trying to solve the problem of the malfunctioning vhf, only to findout the light was the culprit.
Wiring with basic solid state resistors insures you will never have any of htem problems, fromone my lights operate no hotter then mid 90's and if the only malfunction they can have is just not working, nothing more, it burnd out, it just dies, no fireworks, just no light. I was lucky enough to have a conversation with my old company I used to work for who installs marine electronics, the head electronics guy warned me about useing the voltage switching boards or I would have followed suit.
My lights are nothign mroe then the most simple resistor, LED circuits you can make, it is the same basic wiring that I have put in my panels for years and everyone esle too.
The only down side is if I build 12V light, it is a 12v light, you can operate it from 3 to 14 volts and it will get dimmer and brighter accordingly but you cannnot plug them into a 24 or 32v system, you will cook them, AND they have to be wired pos to pos and neg to neg, most boards allow you to hook it up any way and it will work, it will sense the polarity and switch it accordingly. resistor wired LED's have to be wired corectly. For me it was an easy choice, I think most can tell red form black and most have 12v boats, unless you specify and I can wire them for whatever voltage, even ac but it has to be specified.
I hope I didn't bore you guys

But if anyone has any more questions I would love to answer them
