LED Upgrade for GLOCK Tactical Light GTL-10 GTL-11 GTL-21 GTL-22 GTL-51 GTL-52 | eBay
found an LED replacement for Glock GTL model flashlights/combo lasers. It works great and it's just a drop in upgrade (link in the comments) : r/ Glocks
Glock Tac Light w/laser For Sale TAC4065 764503040658 Black
Replacement Bulb for Glock Tactical Light | Best Glock Accessories | GlockStore.com