So far so good, much brighter and easy to install - Lightstar MiniStar 110S 600 Lumens LED Bulb Upgrades for Streamlight SL20X

Brought new life into a 20 year old police flashlight. It is very easy to replace the original lens assembly. If it doesn't work at first, switch the two wires. Much brighter light, as expected. Would have given produce 5 stars, but will go with 4 stars because of unknown durability. So far very pleased with product. I also have replaced my Stinger flashlights with the TerraLux LED replacements with no problems so far.