^^ a little fake golf ball with holes all over it and that's just a shell of plastic.
my idea for that would be to split the ball open, stuff the RAV'N inside, and then at least partially fill the ball with clear sealant. (from a hardware store, just tell them that you need some really flexible and soft clear sealant).. this will help protect the light. I have sort of the same setup and it works awesome!!
Just make sure you place something in the ball and sealant so that you can still squeeze it to turn it on.
i have plans for the RAV'n/photon protectors i made, if you want me to post them i'll write them up, though they are heavy and hurt LOTS when you hit yourself.