Pretty cute for a popcorn popper. You would have to buy a socket to put on the cord but most take large bulbs. The kind I spoke of with a white light works well and is cheap.
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I am thinking that perhaps the small plug-in night lights would light it up enough inside behing the song selector panels
I have a few here already - easy to rig and no heat problemos - one is adjustable as far aa light output and turns on when it is dark - but that can be adjusted too - the other one has a 6 watt light equivilent to a 30 watt stard bulb
The lights in them last forever - and they are El-Cheapo to begin with -