Instruct: Classify the given Amazon review into its appropriate rating category
Query: Collector surface area is relatively small

I like these, and we bought two sets, but when the day is what the weather folks call "partly cloudy," the lights are pretty dim. They work as described, but if I had it to do over, we'd purchase some with a bigger collector surface area - even if the appearance proved unappetizing. At night that flaw would not be visible anyhow. UPDATE It's been 90 days and all the lights are dead. Lowered rating.