Hello,A photographer friend gave me a few of these:http://www.ebay.com/itm/1pcs-10W-Round-Base-LED-Cool-White-High-Power-800LM-LED-Lamp-Chip-DC-9-12V-EM-28-/140888002499?_trksid=p5197.m1992&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D14%26meid%3D5203636072474398295%26pid%3D100015%26prg%3D1006%26rk%3D1%26sd%3D140888002499%26I am having a hard time figuring out what the forward current would be so I can't figure out what size resistor to use.
Also...do you think it would be okay to control these through an arduino and a TIP120? so i'd have the LED cathode grounding controlled through the TIP 120, the anode would have a resistor on it, going into 12v as well as the tip120 would have a 1k resistor going to arduino pin
and also...anyone know where to get good heatsinks for them?
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