A handful of Rife Power! This picture shown the characteristic soft pale blue glow of an Argon tube when driven by 60 Hz AC power.When the tube is excited by RF energy, the discharge takes on a more Violet hue. At very high RF power levels, the color tends to become a violet-blue-white. Notice that the discharge is concentrated along the axis of the tube bore. This is the normal condition when the tube is driven at a fairly low power level.