Sunlite 20-Watt MR11 Dimmable 10-Degree Narrow Spot 12-Volt GU4 2-Pin Base Halogen Light Bulb with Blue Glass Cover (6-Pack) HD03608-6 - The Home Depot
Large Glass (Tube) Cover - Fountains n Slate, Low Voltage Pumps, LED Lights, Fountain Plugs
case of 6) GE Lighting 81765 20 watt Halogen Bulb, Warm White (2900K), Edison, MR16, Bi-Pin (GX5.3) base, cover glass, reflector spot - FrankoLighting
Clear Glass G-9 Lamp Socket Lenses Cover for use with Threaded Skirt G-9 Type
How to remove halogen bulb from protective glass? - Home Improvement Stack Exchange