Sunlite 5-Watt MR11 Aluminum 30-Degree Narrow Flood 12V 3200K Bright White GU4 Base Halogen Light Bulb (6-Pack) HD03611-1 - The Home Depot
Sunlite 66145-SU 20Mr11/Gu4/Sp/12V/R Red Halogen 12V 20 Watt
Westinghouse 5-Watt 12 Volt Halogen MR11 Clear Lens Narrow Flood GU4 Base Light Bulb 0476600 - The Home Depot
RCSB PDB - GU4 Ligand Summary Page
Led Mr11 Bulbs Spotlight Bulb Gu4 Led Bulbs 5 W 18 Led Bulbs 20 W 30 W Halogen Bulbs Led Bulb 12v Dc / Ac For Home Lighting - Led Bulbs & Tubes - AliExpress
CBconcept UL-Listed MR11 GU4.0 LED Light Bulbs, 5-Pack, 2 Watt, Dimmable 230 Lumen, Pure White 6000K, 36° Beam Angle, 12 Volt, 20W Halogen Bulbs Equivalent, Landscape/Accent/Recessed/Track Lighting - - Amazon.com