To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
I have used these black lights to make bug traps by suspending them over containers of water dosed with a little dish soap. They ran 24/7 from the time house plants were brought in from outside until they were taken back out which is about 8 months and lasted two seasons. Two of the lights have had power supply failures in their third season and one has developed a bad connection in the wiring. I replaced the power supply with generic high output supplies which worked fine but will probably have to replace the entire light package on the one with the cord defect. All in all, not bad performance considering the long duty cycles that I have exposed them to.