I have an older minifridge with an incandescent bulb.

If the door gets left slightly open (shitty fridge door) it has literally dehydrated food in 8 hours in the past 3 months that was close to the light.

A pack of meat was jerky hard.

A tortilla became completely cracker-hard

A pack of cheese slices literally melted together on the side.

It absolutely can warm food inside of the fridge.

In other news I am buying an LED bulb for it today...