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Picture of Emergency Led Lighting Made Ridiculously Simple (UPDATED 2-13-14)

Hurricane Isaac hit about a week ago and thousands of homes are still without power. Well, lighting is no problem. All you need is you car, a led dome light and some wire.
 

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Step 1:

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Here is a link where you can buy 12 volt LED car dome lights. This type (festoon, see link below) are typically non-polar meaning that it does not matter which way you connect them to 12 volts.

http://www.superbrightleds.com/cgi-bin/store/index.cgi?action=DispPage&Page2Disp=%2Ffestoon.html

If you are going to connect one of these directly to a car battery you should connect long wires to the battery terminals first and then connect the wires to the light (several feet away from the battery to avoid a spark around the battery). The preferred method is to connect to 12 volts through the cigarette lighter socket. 

The cigarette lighter socket is typically fused and the battery is not, so if your emergency light has a short circuit your wires will melt / fry (not good) because the battery can supply hundreds of amps of current. That’s why it’s a good idea to make and test one before you need it. Better yet make one with a connector / cable with a built in fuse:

 

http://www.powerwerx.com/adapter-cables/cigarette-lighter-plug-powerpole-1ft.html



I got my dome light from here for a little less (the ones with the silver pointed ends are the non polar ones. the ones with red and black wires must be connected red +, black -):
 

http://s.dealextreme.com/search/led+dome+light

You can probably get these from some auto parts stores too. These are quite bright and can easily provide enough light to read or play cards. Any kind of wire will work but telephone wire is probably the cheapest and you can usually get 100 foot rolls at hardware stores, radio shack, walmart (electronics / entertainment department). You should be able to run a led dome light for several days without running the battery down too far. You may want to start up the engine every day or every other day and let it idle for a couple of minutes. With a full tank of gas you should have lighting for many months.

Telephone wire:

http://www.radioshack.com/product/index.jsp?productId=2049729


All kinds of low voltage wire:

http://www.lowes.com/Electrical/Electrical-Wire-Cable/Low-Voltage-Wire/_/N-1z0yt30/pl?

Speaker cable will work fine, so you may be able to get everything you need at a well stocked auto parts store.

 

 

 

 

 

 
tjosephcarter3 months ago

BEST solution is if you can find someplace that sells ham radio gear, pick up some Anderson Powerpole connectors. Attach heavy (as appropriate for the battery) wires to the battery with an appropriately sized automotive fuse inline, terminated in Powerpoles. A 7Ah battery (8 or 9Ah are also 7Ah, just with more clever definition of "Ah" to make them seem bigger) retails for about $20-30. You'd be amazed how much light you get out of 3 watts of white LEDs, which Ohm's Law tells us is 0.25 amps, which probably means about 20 hours of light. (Yes, I'm factoring that you may want to use that battery again and that you don't want to drain it all the way to "dead".)

Powerpoles aren't cheaper than cigarette lighter connectors, and you need a pin crimper to assemble them. But if you put them together in "ARES standard", they're cheap and basically bi-directional. They're genderless, which is really very handy. And they're smaller than cigarette lighter connectors.

sunpialia2 years ago
Great, I have a good site for your selection of LED lights which is http://www.ledlightshub.com.
how much power do these dome lights require? how bright are they?
luxstar (author)  amandaghassaei2 years ago
Here is one similar to the one I purchased about a year ago:

http://www.dealextreme.com/p/sv85-0-84w-145lm-11000k-9x5050-led-white-light-bulb-for-car-license-plate-dome-door-82775?item=10

The specifications from Deal Extreme says: 0.84 Watts (under 100 milliamps) 145 Lumens (for reference, a 40 watt incandescent is under 500 Lumens The most common wattages for this type of bulb appears to be 1 watt (or a little less) 2 watt and 2.5 watt. I have soldered up some 12 volt light boards. They are easy to make. The ones I make have 4 leds and a 33 ohm resistor in series which ends up being about 20 milliamps at 14 volts max. for about 1/3 watt.