What are the Northern lights? Why do the appear? Where can you see them? The answers are all in this book. The Northern Lights is a book-banded reading book for developing readers, carefully levelled at Purple Book Band. Illustrated throughout with beautiful photographs, this 432-word non-fiction book features a more demanding text with an extended vocabulary. It is suitable for ages 7 - 8. The Northern Lights is part of Ransom Reading Stars, a structured programme for children learning to read. The series has fifteen levels: four phonics levels and eleven book band levels (Pink through to Lime).