A plasma lamp head that has a spherical plasma bulb whose upper hemisphere serves as the top of the head, a decorative face and lower back of the head covering the lower hemisphere of the bulb. In one example, a disclosed composition includes at least Stachys betonica, Achillea millefolium, Marrubium vulgare, and Urtica dioica. If the average picture level is calculated at a first level, a generating time point of the data mapped to the second sub-field group is controlled to be at a first starting time point.