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A cheap and simple way to connect a 10W LED to a 12 volt supply. A current regulated LED driver keeps the LED at maximum brightness, while a heatsink and fan keeps it at a safe temperature. Total cost of parts, including the car cigar lighter plug and cable, is around £4.

2 Pin 50mm DC 12V VGA Card Cooler Heatsinks Cool Fan SY http://r.ebay.com/jVvnaY

5 X High Power 10W Warm White DC 9-11V LED Beads Lamp Bulb Chips 900-1000LM SMD http://r.ebay.com/BHbfHJ

1pcs Power Driver for 1x10w LED Light Lamp 950mA 12V MR16 http://www.ebay.com/itm/1pcs-Power-Dr...

12V 24V Male Car Cigarette Lighter Socket Plug Connector On Off Switch 1.5m DBX http://r.ebay.com/SLv2Op