Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Reading light

I have had my kindle for approx 3 months and am completely satisfied with it except that it does not have a built-in light for night reading. I read my kindle while watching TV (during commercials) when the room lights are low. I would be in hog heaven if I didn't have to use a separate light to read my kindle during this time. Is there a reason why it doesn't have one - similar to cell phones???