The Etlin Daniels FL423V-Q is a multi-wattage 4 pin quad CFL lampholder/socket. It is non-indexed so that it can accommodate 13/18/26/32 and 42 watt G24-Q or GX24-Q base quad tube CFL lamps. The Etlin Daniels FL423V-Q socket has no notches (non-indexed) to stock one lampholder instead of 5. It has a 2 hole base for horizontal mounting and quick connects for quick wiring. The Etlin Daniels FL423V-Q is similar or equal to the Satco 80-2106, 80-2107, 80-2108, 80-2109, Etlin Daniel FL423V-Q1, FL423V-Q2, FL423V-Q3, FL423V-Q4, FL423V-Q3/4. It will fit All Phillips PLC and PLT CFL's, Sylvania D/E and T/E CFl's and GE Biax and Triple Biax lamps