These look great and have good reviews but one person did say that they weren't very warm:
https://www.amazon.com/gp/aw/d/B01E8TXGBI/ref=ox_sc_act_image_1?ie=UTF8&psc=1&smid=A3TK8K4SPZHVO4
This search based on the puck bulbs returns many interesting results, including replacement bulbs for 12V systems:
g8.6 led bulb bonlux 2W
These are the ones that are actually puck shaped that I tried and they're very nice (but not as warm as I'd like):
https://www.amazon.com/Bonlux-Dimmable-Daylight-Replacement-Undercabinet/dp/B01D31HURI?th=1&psc=1
