Osram CFL Square CR10q Energy Saving Bulbs 16 W, 835/4-PIN

GR10Q 4-PIN 28W Compact Fluorescent Lamp Neutral White 4000K, 230V(Large Size 20 20cm), Recessed Ceiling Light, CFL Light Bulb, Low Energy Light Bulb, Suitable for Indoor Stair Corridors, Halls. Power: 16 watts.

eBay