I enjoy working with light in my practice. I use it as a way of inviting closer inspection of my house pieces. It gives them some life in the way that lighting works with a dollshouse.
I made a light module circuit as a source for a small prototype lightbox to display my model houses on. The PCB is a kit from Kitronic. I really enjoyed soldering it.
Arduino has made electronics accessible for artists and designers. LEDs are both low temperature and low voltage. This fact means that they can be used in places and in ways that traditional lightbulbs couldn't previously. The potential of these technologies is really exciting.