This 2 Pack of 18 Watt Double Tube Bulbs is a direct generic replacement for PLC Panasonic FDS18E35/4. With a 4 Pin G24q-2 Base, these bulbs are a Compact Fluorescent Light (CFL) and have a bright white color with a PLD 4 Pin Base. With a wattage of 18 and a life of 10,000 hours, they provide 1200 lumens of light. Manufactured to exacting standards, these bulbs feature top quality components and are guaranteed to perform like the original. With an 82 CRI and a 6" length, these bulbs are a great choice for your lighting needs.