A Cheaper, Lighter Moth Trap (IMAGE) Entomological Society of America Caption Twelve-volt mercury vapor black light traps like the one on the left are heavy and cost between 200-500 dollars apiece. The new LED funnel trap (right) is lightweight and costs about $28.50. Credit Entomological Society of America Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.