I have not yet installed these lamps but I have tested them on the instrument power supply. They start dimming at around 6 volts and then go to full brightness at 12 volts, drawing 1.5 amps for 18 watts. As the voltage increases, the brightness remains the same up to 30 volts and the current is reduced to maintain 18 watts. The light pattern is more dotted than I wanted. Price and build quality are good.
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