I used an early 4000K LED retrofit lamp in my old refrigerator long before LED bulbs were popular. My new refrigerator just has LEDs built into it though the freezer has an oddball incandescent lamp that I can't find a LED retrofit for. Refrigerators are a great place for LEDs IMHO.
Definitely. No overheating (good for the lamp) and low heat production (good for the fridge).