21W 28w 38w Ballast 2d lamp three color square energy-saving fluorescent tube FEL four-pin butterfly tube living room - AliExpress
British Electric Lamps 04131 CFL Square 2 Pin 2D Fluorescent Tube 16W GR8 4000K - John Cribb & Sons Ltd, UK Electrical Distributors, Dorset, Hampshire, Wiltshire, Somerset & the Isle of Wight.
GE LED 2D (6.5w=16w 12.5w=28w) Compact Fluorescent Lamps - Available for CCG/ECG | eBay
Norman Lamps F382D/827/4P-38W Warm-White 2700K - Watts: 38W, Type: 2D Fluorescent Lamp, Color - Amazon.com