Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I haven't even used this product for a month and the light bulb is already burned out.

After less than a month of use the light bulb has already burned out. And, I am having a hard time finding it locally so if I have to order I am out of a light until its sent. Also, they are very costly. For the price they should last longer than 3-4 weeks. I kept it on about 10 hrs a day.