Global Tech LED announces the First DLC Listed Screw-in Retrofit! A Low cost, USA made, Patented E39 (Mogul Base) Screw-in LED Retrofit for customers that have a participating Utility offering cash rebates, the upfront cost could be reduced by as much as 70%. our on-board Patented Life Sync technology and Energy Savings program will increase energy savings and automatically adjust current for continuous maximum lumen output. Our screw-in retrofit can be located on the DLC QPL listing.