Standard Mr16 Shape With Gu10 Twist-n-lock Base (10mm Diameter), This Gu10 Halogen Light Bulbs Easily Twist In All Standard Gu10 Fixtures Without Any Tools.no Lead Or Mercury, No Uv & Ir, Our Halogen Mr16 50w Gu10 Will Not Have Any Damage To Environment, Provides You And Your Family With Safer And Healthier Lighting Ideal For Residential And Commercial Lighting, Such As Recessed Lighting, Track Lighting, Accent Lighting,and Landscape Lighting. They Provide A Bright Warm White Light And Are Perfect For Accenting Your Decor.halogen Light Bulbs Are No Lead Or Mercury. Dimmable. Outstanding Heat Dissipation Light Bulbs Are Ideal For Used For Accent Lighting, Track Lighting In Homes, Offices, Art Gallery, Museum, Restaurant, Retail Shop, Etc. Produce A Clear Yellow Light Which Provides You With The Best Lighting Experience, Giving Performance-oriented Drivers Additional Safety Time And Comfort Non-flickering Light And No Uv Radiation Helps You Avoid Eye Fatigue And Provides You With A Comfortable, Stress-free Atmosphere. Better Protect Your Eyes.some Bulbs Warm Up Slowly, Taking Time To Achieve Their Full Brightness Potential. The Halogen Mr16 Bulbs Are No Waiting Time Required. Each Bulb In This Pack Immediately Provides 800 Lm Of Light For Full Brightness In An Instant.