Globe 54746 50-Watt MR16 Halogen Flood Bulb with GU10 Base, 4 Pack Provides crisp, bright and white light. Can be dimmed without the need for a special dimmer. Transformer-freeoperation allows the bulb to run directly off the main voltage supply (110/120V) while the ceramic base is designed to withstand a high degree of heat. Mirror-like reflector inside bulb face projects a broad beam of light and provides a higher lumen output. Twist-and-lock feature of the Globe halogen GU10 bulb allows for a safe and secure connection.