Very nice light Led bulb, that provides the impression of fireworks in 3D. I have assembled mine on an old wood block and connected it wall power through an old cloth twisted cord, giving the impression of being an old device. Unfortunatelly, it is clear that this kind of bulb has a limited life (measured in working hours), so I only light it up when it really worth. Several sites on web explains how it works, through a mirrored internal surface. It is amazing !