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== Power Profiling == The following is from a power test of the lamp using a large high current 120VAC rheostat to slowly ramp up the voltage and evaluate the current draw. Note that LEDs respond somewhat exponentially to voltage adjustments, and a current limited source is the proper way to power these, however this provides valuable information for the design parameters of such an application. Orange meter is total Current into Schottky Diodes to LEDs Yellow meter is RMS AC Voltage into Schottky Diodes to LEDs Blue meter is total Wattage INCLUDING losses from rheostat Actually LED wattage consumption can be calculated by Amps * Volts Note that volts shown are AC, and feed into a Diode bridge, which generates a 4 Volt drop and rectifies to a DC voltage. So the actual power being consumed by the LEDs is:<br/> '''(AC Voltage - 4) * Amps = Watts''' '''Measured AC Voltage & Current''' <pre> Test Volts Amps Watts ------------------------ #1 42 1 55 #2 44 1.5 83 #3 45.4 2 107 </pre> '''Calculated DC Voltage & Current''' <pre> Test Volts Amps Watts ------------------------ #1 38 1 38 #2 40 1.5 60 #3 41.4 2 83 </pre> [[File:LED-42v.jpg]] [[File:LED-44v.jpg]] [[File:LED-45v.jpg]]
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