Save energy with LED, how to replace halogen G4 lamps by LED G4 in existing downlights - YouTube
G4 LED Light Bulb 12V 2W Warm White 3000K, 200LM, G4 10W 20W Halogen Lamp Equivalent,
Rayhoo 10pcs G4 LED Bulbs JC Bi-Pin Base Light Bulbs 3W AC/DC 12V 20W-30W T3 Halogen Bulb Replacement Landscape Bulbs(Warm White 3000K) - Newegg.com
G4 LED Bulbs 12V 20W Halogen Bulb Replacement, HengBo G4 Bi Pin Base JC Type T3 Light Bulb Warm White 3000K for Under Cabinets Home Lights, Non-Dimmable, (Pack of 10) - -