Lindgren-Pitman LP Electralume Deep Drop Light with Lithium BatteryLindgren Pitman Electralume Deep Drop Underwater Lights have emerged as the State of the Art Deep Water Fishing Light. LED lumination powered by replaceable Lithium Ion batteries that last up to 500 hours means that Electralume Fishing Lights are much brighter and dont fade overnight like ordinary chemical lights. Electralume Fishing Lights consistant high intensity illumination far outperforms other fishing lights and chemical light sticks.