well to be quite frank about it, the black head will always have more power than the sparkle for several reason .one is that the orbator transducer in the field windings of the secondary patch conductor gains more wattage because of the bias on the preliminary post polarity module.secondly the black head when playing in the sun won't dissapate heat as well as the sparkle because of the lighter color and that the silver image bounces the heat back into the atmoshere,thus building more heat on the bias plate to the secondaries primary binary inductance cable.in sumation of the subject and to get it into techical terms for the common guitarist ,it all in actuality sounds like a crock just like all the B S you just read to get to this part ... just havin fun .... have a good one .... Shadow