STINGER LED BULB REPLACEMENT SWITCH MODULE = BULB. Upgrade will help produce 350 more lumens than the original LED Description 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.