Upgrade will help produce 350 more lumens than the original LED This upgrade kit includes?the Face Cap Assembly,?Retaining Ring,?and?C4 LED with Switch?Assembly needed to upgrade your?existing?Stinger LED?or Stinger DS?LED to the new C4 LED?Technology.? (For original Stinger LED models without C or C4 in the serial number.) The C4 technology?upgrade doubles?your Stinger LED&';s brightness to 350 lumens.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }