Genuine FerroWatt F1920 Double Loop Filament Lamp 30 Watt Antique Reproduction Light Bulb 30w Dimensions: 2.5in x 4.25in Ships in original FerroWatt packaging! DO NOT attempt to light FerroWatt Electric Bulb with match! Simply turn switch as appropriate for fixture. Use of Electricity of lighting is in no way harmful, nor does it affect soundness of sleep.