Generic 4-pack replacement bulbs for Panasonic FDS18E35/4 18W quad-tube fluorescent lamps .

3500K color temperature providing bright white light (neither too warm nor too cool) .

4-pin G24q-3 base designed specifically for Panasonic bathroom fan and light combo units .

Compatible with Panasonic models specifying FDS18E35/4, FDS 18E27/4, or FDS18E42/4 lamps .

18-watt compact fluorescent lamp (CFL) with T4 bulb shape and approximately 1200 lumens output .

Energy-saving alternative that works with existing ballasts (LED upgrade typically requires bypass) .

Mixed user reviews: some report excellent value and brighter light than name brand , while others note occasional quality control issues .

Easy installation: fits existing fixtures without modification