what does "light-up"here mean? is it buring? or just shinning?
His father in light-up bunny ears that made Selina belly-laugh. The pleasure on his grandmother’s face when he gave her a pretty bowl filled with mixed spring bulbs in fragrant bloom.

Question

Answer

"Light-up" here is an adjective that explains the bunny ears have a light inside them that turn on and off.

Shining would be a good description. Because the light would be shining.

Here is a picture.
http://glosticks.co.uk/400-389-large/led-pink-light-up-flashing-bunny-ears.jpg