We used the chem sticks that you crack to activate and either clear taped them or zip tied them to the plane. The chem sticks last a good 4 hrs. and can be seen as far as I would ever want to fly the plane, we used the on heli's also and the worked great. I always say I am going to build a Night Rider plane and install the rope lighting and cover it with trans. Monokote but ...well you know
The nice thing about the chem sticks is they come in many colors.