This converter allows growers to use regular E40 reflectors with CDM ballasts and 315 W lamps. Simply screw into the E40 fitting and the 315 W lamp will fit in.It allows the user to convert a “standard” reflector with an E40 fitting into a 315w reflector. This is particularly useful if you already have a reflector you like or if you’re working to a budget. Installation is very easy. Simply screw the PGZ 315 lamp holder into the reflector and it’s ready to accept the lamp. Please be sure to switch all power supplies off before BEFORE adding the adapter.