While testing the actual power draw (primitively) of different colours of 3W LED GU10 lamps using a standard plug-in power monitoring meter I came across something that I found quite pleasing. The LEDs are in a series string of three run at about 350mA and the forward voltage across them will vary from about 6V for the gallium arsenide technology LEDs (red) to 9V for the gallium nitride technology LEDs (blue, green and phosphor coated). It just so happens that the use of a current regulated supply means the power draw measured by the plug-in meter in Watts is almost exactly the same as the forward voltage of a single LED. So in the case of the red LEDs it was 1.9W and for the others it varied between 2.6 and 3W. Just an oddity that caught my attention.