Feit Electric 13-Watt Equivalent PL CFLNI Quad Tube 2-Pin GX23-2 Base Compact Fluorescent CFL Light Bulb, Soft White 2700K (1-Bulb) BPPLD13/HDRP - The Home Depot
Viribright 13W-18W Equivalent Cool White (4000K) GX23 Rotary Base Horizontal PL LED Light Bulb 750157 - The Home Depot
3 Ways to Replace Halogen Downlights with Led - wikiHow
13-18 Watt Equivalent PL Lamp G24D-2P (2-Pin) Benchmark II Vertical LED Light Bulb
TORCHSTAR MR16 LED Light Bulb, GU5.3 Bi-Pin Base, 50W Halogen Equivalent, 6.5W 12V AC/DC Spotlight Bulb, 550lm, 5000K Daylight, for Recessed Light, Track Lighting, 3 Years Warranty, Pack of 6 - Walmart.com
Converting to LED lights: everything you need to know | Live Better | The Guardian